CN104126551B - A kind of method of floating tobacco seedlings breeding aphidius gifuensis - Google Patents
A kind of method of floating tobacco seedlings breeding aphidius gifuensis Download PDFInfo
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Abstract
A kind of floating tobacco seedlings breeding aphidius gifuensis method of disclosure, particularly cultivates the numerous aphid of tobacco seedlings of neat stalwartness, appropriate density, connects stiff aphid Seedling, the numerous honeybee method of floating tobacco seedlings when cover net in good time, belong to insecticide and raise and biological control of insect pests technical field.High-efficiency floating seedling Aphidius gifuensis propagation technical system of the present invention, cultivating, host plant, host egg cigarette aphid and the breeding numerous honeybee link of aphidius gifuensis 3 are all innovated, making numerous honeybee cycle time to about 2 months, the stiff aphid of every square metre and parasitic aphid reach more than 120,000；Without transplanting and cultivate the links such as cigarette strain, management work is easy, and required manpower and materials are less；The present invention can effectively utilize the numerous honeybee of existing culture facility, decreases numerous honeybee facility and puts into, has saved numerous honeybee expense.The present invention is checked in aphidius gifuensis Ashmaed scale propagation works, the aspects such as the time efficiency of the numerous honeybee of its scale, unit are efficiency, the efficiency of management, culture facility utilization obtain comprehensive raising, numerous honeybee cost is substantially reduced, and the most tobacco company in the whole nation has adopted the numerous honeybee method of the present invention.
Description
Technical field
A kind of floating tobacco seedlings breeding aphidius gifuensis method of the present invention, particularly cultivates the numerous aphid of tobacco seedlings of neat stalwartness, appropriate density, connects stiff aphid Seedling, the numerous honeybee method of floating tobacco seedlings when cover net in good time, belong to insecticide and raise and biological control of insect pests technical field.
Background technology
Denomination of invention " high-efficiency floating seedling Aphidius gifuensis propagation method " Chinese patent (application number or the patent No.: 201110209370.2) that applicant once declared, seedling raising greenhouse, field nursery hut and the nursery pond thereof that this patent application publication is vacated after utilizing flue-cured tobacco transplanting, carries out alternate row seeding floating seedlings with 162 holes or 200 hole drift dishes；Aphid, numerous aphid is connect when tobacco seedlings has 3～4 true leaves；When aphid amount reaches 300～350 heads/plant, by honeybee: aphid connects honeybee amount than 1:100's, required one-tenth honeybee is accessed in cover net；Under 20～30 DEG C of conditions, through 10～15 days, stiff aphid is formed in a large number, becomes bee eclosion.
But through the actual popularization and application of 3 years, it is found by the applicant that: former declaring adopts 3～4 leaf 1 heart tobacco seedlings to connect aphid, numerous aphid in patent, there is problems of tobacco seedlings less, quick growth along with aphid amount, tobacco seedling growth is bad, causes that a large amount of parasitic aphid is fled from or dead, and the stiff aphid amount of formation is less；The honeybee opportunity of connecing in former patent return is to access into honeybee when aphid amount reaches 300～350 heads/plant, there is problems of producing in reality the numerous honeybee of scale, owing to easily causing damage when collecting into honeybee, becoming honeybee easily dead, the effective percentage of be connected into honeybee is relatively low, its result be connect after honeybee can not fully parasitic cigarette aphid, the stiff aphid amount of formation is less.
Summary of the invention
It is an object of the invention to improve Problems existing in former patent application, a kind of floating tobacco seedlings breeding aphidius gifuensis method of this offer, improve numerous honeybee efficiency further.
One Floating seedling of the present invention breeding aphidius gifuensis method step is as follows:
(1) nurturing staff: when tobacco seedlings has 5 true leaves, straight snips one hypo-tobacco leaf, press down big short little, to cultivate, growth is neat, Group Consistency is good, the healthy and strong tobacco seedlings of appropriate density；
(2) connecing the numerous aphid of aphid: when waiting step tobacco seedlings to grow to 6 true leaves, connect by kind of an aphid and guide in tobacco seedlings, allow cigarette aphid spread breeding voluntarily, the healthy and strong tobacco seedlings load aphid amount formed after Leaf cutting is high, continues numerous aphid time long, and the numerous aphid amount of unit are is high；
(3) the numerous honeybee of honeybee is connect: when cigarette aphid quantity reaches about 150 heads/plant, by honeybee: aphid is than the honeybee amount that connects for 1:50, the stiff aphid of required aphidius gifuensis and parasitic aphid (stiff aphid Seedling) are accessed in cover net, appoint into honeybee sprout wings voluntarily, parasitic cigarette aphid, breed the aphidius gifuensis made new advances；
(4) live tobacco seedlings with the 60 numerous honeybee cover guards of order in time after connecing aphid, form space limited, that close, until numerous honeybee is terminated, prevent from connecing the intrusion of aphidius gifuensis and other insecticide after aphid, affect the breeding of cigarette aphid, it is prevented that the fleeing from of aphidius gifuensis after connecing honeybee, improve parasitic effects.
Described (1st) step utilizes existing seedling growth greenhouse, the drift dish adopting length × wide × height to be 66.5cm × 34cm × 5.5cm, 162 cave specifications, numerous honeybee tobacco seedlings is cultivated by the nursery requirement of floating tobacco seedlings, without filling the gaps with seedlings, when tobacco seedlings 5 leaf 1 heart, by floating seedlings requirement straight snips one hypo-tobacco leaf, press down big short little, cultivate the healthy and strong tobacco seedlings that growth is neat, Group Consistency is good；The natural death of part tobacco seedlings and Leaf cutting in seedling raising process, reducing gap between the Seedling of tobacco seedlings density, formation increases permeability, meets cigarette aphid and breeds the needs of subenvironment between Seedling.
Described (2nd) step is when tobacco seedlings has 6 leaf 1 heart, kind of aphid leaf is laid in tobacco seedlings (cigarette aphid raw leaf back contact tobacco seedlings), cigarette aphid is appointed to spread voluntarily, when aphid amount average in tobacco seedlings about 10 heads/plant, kind of an aphid leaf is changed in new tobacco seedlings, healthy and strong tobacco seedlings nutritional sufficiency, numerous aphid amount is high, the persistent period is long.
(3rd) described step is when cigarette aphid quantity reaches about 150 heads/plant, by honeybee: the stiff aphid of required aphidius gifuensis and parasitic aphid (stiff aphid Seedling), than the honeybee amount that connects for 1:50, are accessed in cover net, become honeybee to continue to sprout wings, constantly parasitic cigarette aphid by aphid, and bee yield is high.
Described (4th) step lives tobacco seedlings with the 60 numerous honeybee cover guards of order after connecing aphid in time, until numerous honeybee is terminated, forms space limited, that close, prevent from connecing the intrusion of aphidius gifuensis and other insecticide after aphid, affect the breeding of cigarette aphid, it is prevented that the fleeing from of aphidius gifuensis after connecing honeybee, improve parasitic effects.
One of innovative point of the present invention is by Leaf cutting, presses down big short little, and tobacco seedling growth is neat, healthy and strong, and individual plant load aphid amount is high and lasting, and the effective numerous aphid tobacco seedlings quantity of unit are increases, and Group Consistency is good, and numerous aphid amount of unit are is high, it is achieved the lasting effect of efficient numerous aphid.
Efficiently breed the key technology of aphidius gifuensis to be in that in unit are Fast-propagation and go out substantial amounts of host aphid.Breeding substantial amounts of host aphid, one is the fertility of host aphid self, such as single female farrowing amount, generation time etc.；Two is the nutrition having enough host plants and abundance thereof；Three is need suitable conditions of growth and development, such as suitable temperature, humidity, illumination and vivosphere.In numerous aphid works, people often it is merely observed that the quantity of host plant, ignores the density of host plant, i.e. the vivosphere impact on aphid growth promoter.If tobacco seedlings density is too high, Seedling is weak, being unfavorable for the breeding of cigarette aphid, not only aphid amount is relatively low, also can produce substantial amounts of alatae.Former patent return notices tobacco seedlings density issue, is effectively increased numerous aphid amount, but have ignored the impact on later stage breeding effect of the lasting effect of efficient numerous aphid.
The numerous honeybee method of the present invention, when tobacco seedlings has 5 true leaves, carries out a straight snips and processes, and one of its effect is the growth that can promote tobacco seedlings root, stem, and less the tobacco seedlings of leaf-cutting is neat, healthy and strong, and Group Consistency is good；Connecing aphid, numerous aphid when tobacco seedlings 6 leaf 1 heart, the load aphid amount of tobacco seedlings is also higher, and lasting effect is also longer, connects after aphid the 12nd day, and aphid amount reaches nearly 500 heads/plant, keeps more than 700 heads/plant, be conducive to the lasting parasitism of aphidius gifuensis within the time of the 15th～21 day.The two of its effect serve to press down big short little effect, when tobacco seedlings has 5 true leaves, carry out a hypo-tobacco leaf straight snips and process, make effective numerous aphid tobacco seedlings quantity in unit are increase.The three of its effect eliminate partial blade after Leaf cutting, allow tobacco seedlings appropriate density, and the intensity of illumination between Miao Yumiao increases, and serves the effect of interlacing nursery, are conducive to the cigarette aphid breeding carried out afterwards.And without the tobacco seedlings of Leaf cutting, connect after aphid the 18th day, aphid amount only reaches nearly 420 heads/plant, thereafter quantity rapid decrease.
The two of innovative point of the present invention are as planting honeybee using stiff aphid and parasitic aphid (stiff aphid Seedling), and stiff aphid and parasitic aphid and raw be stiff aphid Seedling in tobacco seedlings, become honeybee persistently to sprout wings voluntarily, parasitic cigarette aphid, it is to avoid artificially collect the damage to one-tenth honeybee, improve parasitism efficiency.
The honeybee opportunity of connecing in former patent return is to access into honeybee when aphid amount reaches 300～350 heads/plant, Problems existing one is to produce in reality the numerous honeybee of scale, owing to easily causing damage when collecting into honeybee, becoming honeybee easily dead, the effective percentage of be connected into honeybee is relatively low, and its result is can not fully parasitic cigarette aphid after connecing honeybee；In addition connecing during honeybee that aphid amount is higher, tobacco seedlings is more weak, cause that parasitic aphid is fled from or dead, the stiff aphid amount of formation is less, this be also we original to declare previous item patent unexpected.
The application is when aphid amount reaches about 150 heads/plant, and by honeybee: aphid connects honeybee than the honeybee amount that connects for 1:50, the kind honeybee of access is stiff aphid Seedling, existing stiff aphid, also has parasitic aphid, becomes honeybee to continue to sprout wings, parasitism cigarette aphid after connecing honeybee, avoid the damage artificially collected becoming honeybee, improve parasitic efficiency.
The three of innovative point of the present invention have been to maintain " pressure connects honeybee " method of former patent application, efficiently parasitic cigarette aphid.
Cover tobacco seedlings with 60 order fly nets, form space limited, that close, prevent the intrusion of aphidius gifuensis and other insecticide after connecing aphid, affect the propagation of cigarette aphid；Fleeing from of aphidius gifuensis is prevented after connecing honeybee.The aphidius gifuensis parasitism to cigarette aphid, except the parasitic ability of self, also by the impact of activity space with host plant density.The space of seedling raising greenhouse is very big, aphidius gifuensis free diffusing, it is difficult to form the efficient parasitism to cigarette aphid.So, the Small plastic shed made of 60 order fly nets covers tobacco seedlings, makes aphidius gifuensis can only find cigarette aphid in space limited, that close parasitic, becomes a kind of " pressure connects honeybee method ", be effectively increased parasitic rate, define more stiff aphid.
The four of innovative point of the present invention are that numerous honeybee comprehensive benefit improves further.
Floating seedling breeding aphidius gifuensis technical system after the above-mentioned improvement of the present invention, cultivating host plant, connect aphid-numerous aphid, connect honeybee-the numerous honeybee link of numerous honeybee 3 on all innovate, not only maintain the advantage such as " utilize the numerous honeybee of existing culture facility, numerous honeybee cycle is short, cost is low " in former patent application, further improves the bee yield of bee yield every square metre nursery pond and reach more than 120,000.
Accompanying drawing explanation
Fig. 1 is numerous aphid amount (head/plant) change curve in two kinds of tobacco seedlings processing mode processes.
2013 to 2014, in the Fan Feng base, Muller branch company east wind Triangle of applicant's unit, in conjunction with the numerous honeybee work of scale, carry out the leaf-cutting numerous honeybee of floating tobacco seedlings and the non-numerous honeybee of leaf-cutting tobacco seedlings, define a set of new Floating seedling breeding aphidius gifuensis method, further increase numerous honeybee efficiency.Step is as follows:
(1) nurturing staff: when tobacco seedlings has 5 true leaves, straight snips one hypo-tobacco leaf, produce to press down big short little effect, after cultivation, acquisition growth is neat, Group Consistency is good, the healthy and strong tobacco seedlings of appropriate density；
(2) the numerous aphid of aphid is connect: when the tobacco seedlings of the 1st step has grown to 6 true leaves, being connect by kind of an aphid guides in tobacco seedlings, cigarette aphid is allowed to spread breeding voluntarily, the growth formed after Leaf cutting is neat, Group Consistency good, appropriate density healthy and strong tobacco seedlings load aphid amount is high, continuing numerous aphid time long, the numerous aphid amount of unit are is high；
(3) connect the numerous honeybee of honeybee: when cigarette aphid quantity reaches about 150 heads/plant, by honeybee: the stiff aphid of required aphidius gifuensis and parasitic aphid (stiff aphid Seedling), than the honeybee amount that connects for 1:50, are accessed in cover net by aphid, appoint into honeybee sprout wings voluntarily, parasitism cigarette aphid, numerous aphidius gifuensis made new advances；
(4) live tobacco seedlings with the 60 numerous honeybee cover guards of order in time after connecing aphid, until numerous honeybee is terminated, form space limited, that close, prevent from connecing the intrusion of aphidius gifuensis and other insecticide after aphid, affect the breeding of cigarette aphid, it is prevented that the fleeing from of aphidius gifuensis after connecing honeybee, improve parasitic effects.
(1st) step utilizes existing seedling growth greenhouse, the drift dish adopting length × wide × height to be 66.5cm × 34cm × 5.5cm, 162 cave specifications, numerous honeybee tobacco seedlings is cultivated by the nursery requirement of floating tobacco seedlings, without filling the gaps with seedlings, when tobacco seedlings 5 leaf 1 heart, by floating seedlings requirement straight snips one hypo-tobacco leaf, press down big short little, cultivate the healthy and strong tobacco seedlings that growth is neat, Group Consistency is good；The natural death of part tobacco seedlings and Leaf cutting in seedling raising process, reducing gap between the Seedling of tobacco seedlings density, formation increases permeability, meets cigarette aphid and breeds the needs of subenvironment between Seedling.
(2nd) step is when tobacco seedlings has 6 leaf 1 heart, kind of aphid leaf is laid in tobacco seedlings (cigarette aphid raw leaf back contact tobacco seedlings), cigarette aphid is appointed to spread voluntarily, when aphid amount average in tobacco seedlings about 10 heads/plant, kind of an aphid leaf is changed in new tobacco seedlings, healthy and strong tobacco seedlings nutritional sufficiency, numerous aphid amount is high, the persistent period is long.
(3rd) step is when cigarette aphid quantity reaches about 150 heads/plant, by honeybee: the stiff aphid of required aphidius gifuensis and parasitic aphid (stiff aphid Seedling), than the honeybee amount that connects for 1:50, are accessed in cover net, become honeybee to continue to sprout wings, constantly parasitic cigarette aphid by aphid, and bee yield is high.
(4th) step lives tobacco seedlings with the 60 numerous honeybee cover guards of order after connecing aphid in time, until numerous honeybee is terminated, forms space limited, that close, prevent from connecing the intrusion of aphidius gifuensis and other insecticide after aphid, affect the breeding of cigarette aphid, it is prevented that the fleeing from of aphidius gifuensis after connecing honeybee, improve parasitic effects.
The breeding effect of two kinds of tobacco seedlings processing modes of embodiment 1(compares)
(1) tobacco seedlings is cultivated
In same numerous honeybee canopy, with length × wide × height be 66.5cm × 34cm × 5.5cm, 162 cave specifications floating disc, by floating seedlings requirement seeding and seedling raising.
(2) aphid, numerous aphid are connect
I (the former method) of process: when 3～4 true leaves of tobacco seedlings, being laid in tobacco seedlings by kind of an aphid leaf, leaf back is downward, cigarette aphid is appointed to spread voluntarily, when tobacco seedlings on average has cigarette aphid about 10 heads/plant, kind of an aphid leaf is changed in new tobacco seedlings, cover with the fly net of 60 orders in time after connecing aphid.
Process II (the inventive method): when tobacco seedlings has 5 true leaves, by floating leaf of tobacco seedling leaf shearing requirement straight snips, after leaf-cutting 3 days, when tobacco seedlings forms the 6th true leaf, being laid in tobacco seedlings by kind of an aphid leaf, leaf back is downward, cigarette aphid is appointed to spread voluntarily, when tobacco seedlings on average has cigarette aphid about 10 heads/plant, kind of an aphid leaf is changed in new tobacco seedlings, cover with the fly net of 60 orders in time after connecing aphid.
(3) numerous aphid management
Pack up sunshade net when connecing aphid, strengthen illumination；The management of floating tobacco seedlings requires to carry out water and fertilizer management routinely, keeps vigorous growth with tobacco seedlings, blade is light green is advisable；Make temperature of shed be maintained at 20 DEG C～30 DEG C by the folding and unfolding of awning film and sunshade net as far as possible.
(4) investigation statistics
Adopting parallel sampling method, connect after aphid the 3rd day, the 6th day, the 9th day, the 12nd day, the 15th day, the 18th day, the 21st day, extract 10 dish tobacco seedlings altogether at the two ends of nursery pond and middle part, often dish extracts 10 strain tobacco seedlings, adds up cigarette aphid quantity.
(5) numerous aphid effect
Result shows, when connecing aphid, two kinds of average tobacco seedlings processed are all 135 strains, and 3～4 leaf 1 heart tobacco seedlings are to when connecing aphid 18 days, and average tobacco seedlings number is after 90.4 strains, the highest aphid amount 419.4 heads/plant, dish aphid amount about 37914.Through after connecing aphid 15～21 days of 6 leaf 1 heart tobacco seedlings of Leaf cutting, average tobacco seedlings number is 102.67 strains, the highest aphid amount 736.8 heads/plant, dish aphid amount about 75647.6 leaf 1 heart tobacco seedlings are connecing the 12nd day aphid amount of aphid higher than 3～4 leaf 1 heart tobacco seedlings maximum aphid amount of the 18th day；Meanwhile, the aphid amount of 6 leaf 1 heart tobacco seedlings continues to keep higher level, the aphid amount dramatic decrease of 3～4 leaf 1 heart tobacco seedlings.In Table 1 and Fig. 1.
The breeding effect of two kinds of tobacco seedlings processing modes of embodiment 2(compares)
(1) tobacco seedlings is cultivated
In same numerous honeybee canopy, with length × wide × height be 66.5cm × 34cm × 5.5cm, 162 cave specifications floating disc, by floating seedlings requirement seeding and seedling raising.
(2) numerous aphid, numerous honeybee
I (the former method) of process: when 3～4 true leaves of tobacco seedlings, being laid in tobacco seedlings by kind of an aphid leaf, leaf back is downward, cigarette aphid is appointed to spread voluntarily, when tobacco seedlings on average has cigarette aphid about 10 heads/plant, kind of an aphid leaf is changed in new tobacco seedlings, cover with the fly net of 60 orders in time after connecing aphid.When connecing 15 days average aphid amounts of aphid about 260 heads/plant, by honeybee: aphid is respectively connected to into honeybee or stiff aphid Seedling than 1:50,1:100, covers drift dish with 60 order fly nets after connecing honeybee, appoint into honeybee searching cigarette aphid parasitism.
Process II (the inventive method): when tobacco seedlings has 5 true leaves, by floating leaf of tobacco seedling leaf shearing requirement straight snips, after leaf-cutting 3 days, when tobacco seedlings forms the 6th true leaf, being laid in tobacco seedlings by kind of an aphid leaf, leaf back is downward, cigarette aphid is appointed to spread voluntarily, when tobacco seedlings on average has cigarette aphid about 10 heads/plant, kind of an aphid leaf is changed in new tobacco seedlings, cover with the fly net of 60 orders in time after connecing aphid.When connecing 9 days average about 150/dishes of aphid amount of aphid, by honeybee: aphid is respectively connected to into honeybee or stiff aphid Seedling than 1:50,1:100, covers drift dish with 60 order fly nets after connecing honeybee, appoints into honeybee and finds cigarette aphid parasitism.
(3) numerous aphid, bee management
Pack up sunshade net when connecing aphid, strengthen illumination；The management of floating tobacco seedlings requires to carry out water and fertilizer management routinely, keeps vigorous growth with tobacco seedlings, blade is light green is advisable；Make temperature of shed be maintained at 20 DEG C～30 DEG C by the folding and unfolding of awning film and sunshade net as far as possible.
(4) investigation statistics
Adopting parallel sampling method, connect after honeybee the 15th day, the 18th day, the 21st day, the 24th day, extract 10 dish tobacco seedlings altogether at the two ends of nursery pond and middle part, often dish extracts 10 strain tobacco seedlings, statistics tobacco seedlings number, stiff aphid quantity, parasitic aphid quantity.
(5) breeding effect
Result shows, with 3～4 numerous aphids of true leaf tobacco seedlings, respectively connects stiff aphid amount that honeybee processes and total parasitic number and all within the 15th～18 day, keeps higher quantity after connecing honeybee, with stiff aphid Seedling for kind of a honeybee, by honeybee: the stiff aphid amount of aphid=1:50 and total parasitic number are the highest, in Table 2.
6 numerous aphids of true leaf tobacco seedlings of cigarette through Leaf cutting, respectively connect total parasitic number that honeybee processes keeping for the 15th～21 day after connecing honeybee higher quantity, respectively connect the quantity that the stiff aphid amount that honeybee processes after connecing honeybee the 21st～24 day keeps higher, with stiff aphid Seedling for kind of a honeybee, by honeybee: the stiff aphid amount of aphid=1:50 and total parasitic number are the highest；From maximum bee yield, the stiff aphid amount of 6 true leaf tobacco seedlings of Leaf cutting, total parasitic number respectively compared with the high 14958/dish of 3～4 leaf heart tobacco seedlings, 8649/dish, in Table 2.
Going out to be suitable to the stiff aphid Seedling dissipated from seeding and seedling raising to numerous, in numerous honeybee cycle when both stiff aphid or parasitic sum reach maximum, 3～4 leaf heart tobacco seedlings are 58～61 days, and 6 leaf heart tobacco seedlings are 62～65 days, differ only by 4 day time, in Table 3.
With 3～4 numerous honeybees of true leaf tobacco seedlings, owing to tobacco seedlings is weak, cover in numerous honeybee later stage tobacco seedlings, yellow leaf phenomenon serious, section parasitic aphid can not form stiff aphid, and namely effective numerous honeybee rate reduces.6 numerous honeybees of true leaf tobacco seedlings of Leaf cutting, until when being suitable to put honeybee, tobacco seedlings is stood upright all the time, blade keeps green, are all almost stiff aphid and parasitic aphid.
The present invention makes full use of the numerous honeybee of existing culture facility, and numerous honeybee remarkable benefit improves, and land for growing field crops plants cigarette nursery and a large amount of numerous honeybees and works and often conflict mutually in time, and common practices is to build numerous honeybee canopy separately, and its expense accounts for more than half of numerous honeybee cost first.Adopt the numerous honeybee required time of Floating seedling only 2 months, the time difference of cigarette nursery and numerous honeybee nursery, the seedling growth greenhouse vacated after making full use of flue-cured tobacco transplanting and the numerous honeybee of nutritional solution nursery can be planted according to land for growing field crops, numerous honeybee cost can be reduced to a great extent.Such as honeybee numerous in seedling raising greenhouse, the nursery hut of 60 order fly nets only need to be added a cover on nursery pond；Such as honeybee numerous in nursery hut, only into fly net need to be changed 60 orders.Plant after the used nutritional solution of cigarette nursery need not change sterilization and can be continuing with；According to tobacco seedling growth situation after emerging, topdress by the management requirement of floating seedlings.
Claims (4)
1. a floating tobacco seedlings breeding aphidius gifuensis method, it is characterised in that breeding aphidius gifuensis step is as follows:
(1) nurturing staff: when tobacco seedlings has 5 true leaves, straight snips one hypo-tobacco leaf, press down big short little, to cultivate, growth is neat, Group Consistency is good, the healthy and strong tobacco seedlings of appropriate density；
(2) connecing the numerous aphid of aphid: when waiting step tobacco seedlings to grow to 6 true leaves, connect by kind of an aphid and guide in tobacco seedlings, allow cigarette aphid spread breeding voluntarily, the healthy and strong tobacco seedlings load aphid amount formed after Leaf cutting is high, continues numerous aphid time long, and the numerous aphid amount of unit are is high；
(3) connect the numerous honeybee of honeybee: when cigarette aphid quantity reaches about 150 heads/plant, by honeybee: the stiff aphid of required aphidius gifuensis and parasitic aphid or stiff aphid Seedling, than the honeybee amount that connects for 1:50, are accessed in cover net by aphid, appoint into honeybee sprout wings voluntarily, parasitic cigarette aphid, breed the aphidius gifuensis made new advances；
(4) live tobacco seedlings with the 60 numerous honeybee cover guards of order in time after connecing aphid, form space limited, that close, until numerous honeybee is terminated, prevent from connecing the intrusion of aphidius gifuensis and other insecticide after aphid, affect the breeding of cigarette aphid, it is prevented that the fleeing from of aphidius gifuensis after connecing honeybee, improve parasitic effects；
Described (2nd) step is when tobacco seedlings has 6 leaf 1 heart, kind of an aphid leaf is laid in tobacco seedlings, cigarette aphid raw leaf back contact tobacco seedlings, cigarette aphid is appointed to spread voluntarily, when aphid amount average in tobacco seedlings about 10 heads/plant, changing in new tobacco seedlings by kind of an aphid leaf, healthy and strong tobacco seedlings nutritional sufficiency, numerous aphid amount is high, the persistent period is long.
2. floating tobacco seedlings according to claim 1 breeding aphidius gifuensis method, it is characterized in that (1st) step utilizes existing seedling growth greenhouse, the drift dish adopting length × wide × height to be 66.5cm × 34cm × 5.5cm, 162 cave specifications, numerous honeybee tobacco seedlings is cultivated by the nursery requirement of floating tobacco seedlings, without filling the gaps with seedlings, when tobacco seedlings 5 leaf 1 heart, by floating seedlings requirement straight snips one hypo-tobacco leaf, press down big short little, cultivate the healthy and strong tobacco seedlings that growth is neat, Group Consistency is good；The natural death of part tobacco seedlings and Leaf cutting in seedling raising process, reducing gap between the Seedling of tobacco seedlings density, formation increases permeability, meets cigarette aphid and breeds the needs of subenvironment between Seedling.
3. floating tobacco seedlings according to claim 1 breeding aphidius gifuensis method, it is characterized in that (3rd) step is when cigarette aphid quantity reaches about 150 heads/plant, by honeybee: aphid is than the honeybee amount that connects for 1:50, by in the stiff aphid of required aphidius gifuensis and parasitic aphid or stiff aphid Seedling access cover net, honeybee is become to continue to sprout wings, constantly parasitic cigarette aphid, bee yield is high.
4. floating tobacco seedlings according to claim 1 breeding aphidius gifuensis method, it is characterized in that (4th) step lives tobacco seedlings with the 60 numerous honeybee cover guards of order after connecing aphid in time, until numerous honeybee is terminated, form space limited, that close, prevent from connecing the intrusion of aphidius gifuensis and other insecticide after aphid, affect the breeding of cigarette aphid, it is prevented that the fleeing from of aphidius gifuensis after connecing honeybee, improve parasitic effects.
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