CN111264325A - Method for monitoring and preventing potato late blight - Google Patents

Method for monitoring and preventing potato late blight Download PDF

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CN111264325A
CN111264325A CN202010193957.8A CN202010193957A CN111264325A CN 111264325 A CN111264325 A CN 111264325A CN 202010193957 A CN202010193957 A CN 202010193957A CN 111264325 A CN111264325 A CN 111264325A
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late blight
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monitoring
potato late
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刘进华
王婷
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刘进华
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00Cultivation of specific crops or plants not otherwise provided for
    • A01G22/25Root crops, e.g. potatoes, yams, beet or wasabi
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00Protecting plants
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N37/00Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/36Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
    • A01N37/38Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids having at least one oxygen or sulfur atom attached to an aromatic ring system
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/34Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
    • A01N43/40Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/72Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
    • A01N43/74Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,3
    • A01N43/761,3-Oxazoles; Hydrogenated 1,3-oxazoles
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N47/00Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/08Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
    • A01N47/10Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof
    • A01N47/12Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof containing a —O—CO—N< group, or a thio analogue thereof, neither directly attached to a ring nor the nitrogen atom being a member of a heterocyclic ring
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N47/00Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/08Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
    • A01N47/28Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
    • A01N47/34Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the groups, e.g. biuret; Thio analogues thereof; Urea-aldehyde condensation products

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  • Environmental Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Engineering & Computer Science (AREA)
  • Plant Pathology (AREA)
  • Pest Control & Pesticides (AREA)
  • Wood Science & Technology (AREA)
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  • Agronomy & Crop Science (AREA)
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Abstract

The invention discloses a method for monitoring and controlling potato late blight, which belongs to the technical field of agriculture, agriculture and forestry, and comprises the following steps: s1: selecting a test agent, S2: selecting a test site, selecting moderate soil fertility, gentle slope land, and water and fertilizer conditions, wherein the former crops are all corn-potato packages, and belong to a frequently-occurring region of late blight, S3: performing test area seeding, S4: application is carried out, the crops are sprayed with different medicaments regularly during the test period, and S5: sampling survey, wherein each test area is sampled to record disease strains and disease degree, and S6: efficacy calculation, S7: and (5) carrying out yield evaluation. According to the invention, the time and the disease incidence rule of initial infection of the potato late blight are mastered, the optimal prevention time of the potato late blight is mastered accurately, the optimal medicine and the dosage for preventing and treating the potato late blight are accurate, the pesticide dosage is reduced, the investment is reduced, the prevention and treatment effect is improved, and the soil pollution is reduced.

Description

Method for monitoring and preventing potato late blight
Technical Field
The invention relates to the technical field of agriculture, forestry, agricultural chemical and agricultural chemical, in particular to a method for monitoring and controlling potato late blight.
Background
The monitoring and control of the potato late blight refers to monitoring the potato late blight, carrying out medicament tests in different infection periods according to infection generations, determining the optimal prevention time of the late blight according to test results, and selecting the optimal protective agent, the optimal treatment time and the optimal treatment agent, but the prior art has certain defects: 1. the prevention or control is started only after the diseased leaves (or central diseased plants) are seen by naked eyes, the prevention or control effect is poor, the yield loss is large, 2, the pesticide consumption is large, and the environmental pollution is serious.
Disclosure of Invention
The invention aims to provide a method for monitoring and controlling potato late blight, which is used for mastering the initial infection time and the disease incidence rule of the potato late blight, accurately mastering the best prevention time of the potato late blight, accurately controlling the best medicine and the dosage of the potato late blight, reducing the dosage of pesticides, reducing the input, improving the prevention and control effect and reducing the soil pollution so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the method for monitoring and controlling the potato late blight comprises the following steps:
s1: selecting test agents, wherein the concentrations of the test agents are 30% of flumorph, 52.5% of famoxadone-cymoxanil and 62.5% of silver farci;
s2: selecting a test site, selecting moderate soil fertility, gentle slope land, and water and fertilizer conditions, wherein the former crops are all corn-potato packages, and belong to a frequently-occurring area of late blight;
s3: sowing in the test area;
s4: the pesticide is applied, and different pesticides are sprayed on crops periodically during the test period;
s5: sampling investigation, namely sampling each test area and recording disease plants and disease degree;
s6: calculating the drug effect;
s7: and (5) carrying out yield evaluation.
Preferably, in S2, three large test areas are selected, and each large test area is divided into five small test areas.
Preferably, the area of the small test area is 40 square meters, the width and the length are respectively 5 meters and 8 meters, the walking paths between the small test area and the repetition are both 1 meter, and the potatoes are planted around and sleeved with corns for protection.
Preferably, in S3, potatoes of the variety 'Favorita' are planted in five small areas of the three large areas respectively, the planting density per mu is 4002 pits, the row spacing is 60 centimeters, the plant spacing is 33 centimeters, 10 rows are planted in each small area, 24 pits are planted in each row, 240 pits are planted in each small area, 33.2 kilograms of compound fertilizer 54% Shidanli N, P, K are applied to each mu, and 2500 kilograms of organic fertilizer is applied to each mu.
Preferably, in S4, the spraying is started when the detector shows that the third generation and first infection scores 1.75, and the spraying is carried out once every 7 days and 4 times continuously.
Preferably, the protective agent is sprayed for the first time, the medicaments sprayed on five small test areas in the three large test areas are respectively sprayed with flumorph diluted by 500 times, metrafenone diluted by 900 times, famoxadone diluted by 1000 times, argentum diluted by 600 times and clear water, the medicaments sprayed on the latter three times are respectively sprayed with flumorph diluted by 622 times, famoxadone diluted by 700 times, argentum diluted by 373 times and clear water.
Preferably, when the remote monitor shows that the infection number of the 3 rd time is 7 scores, the protective agent is sprayed, five test small areas in three test large areas are respectively sprayed with the protective agent which is a flumorph suspending agent diluted 1000 times, a mancozeb wettable powder diluted 900 times, a famoxadone and cymoxanil mixed solution diluted 1000 times, famoxadone and cymoxanil diluted 900 times, a silver farina diluted 600 times and clear water, and the therapeutic agent is sprayed after 7-10 intervals.
Preferably, in S5, the sampling method is 5 point samples per test small area diagonal, 2-3 plants per point, and 5 grade grading standard survey, grade 0: disease-free, grade 1: the diseased leaves account for 1/4 below of the total leaves of the whole plant, grade 2: the diseased leaves account for 1/4-1/2 of the total leaves of the whole plant, grade 3, the diseased leaves account for 1/2-1/4 of the total leaves of the whole plant, grade 4: the whole plant leaves almost have scabs, most of the leaves die, and the leaves at the base part die.
Preferably, before application, the disease condition base number of the first time is investigated, the disease condition base number is investigated 3 times after application, the disease condition index is investigated 7 days after application for the first time, the current weather and temperature are recorded at the same time, the disease condition index is investigated 5-7 days after application for the second time, the current weather and temperature are recorded at the same time, the disease condition index is investigated 15 days after application for the third time, the current weather and temperature are recorded at the same time, the harvest time is reached, a middle row is selected from each test small area, and 10 plants are weighed and fresh to measure the yield.
Preferably, in S7, the fresh weight is weighed for each cell, the yield is converted into the yield per mu, and the yield is measured to finally obtain the highest yield of 52.5 percent famoxadone and cymoxanil, the highest yield of 80 percent mancozeb and 52.5 percent famoxadone, the second position of a cymoxanil wheel, the third position of a Yinlu, the fourth position of a 30 percent flumorph suspending agent and the lowest yield of clean water without spraying pesticide.
Compared with the prior art, the invention has the beneficial effects that:
the time and the disease incidence rule of initial infection of the potato late blight are mastered, the optimal prevention time of the potato late blight is mastered accurately, the optimal medicine and the dosage for preventing and treating the potato late blight are accurate, the pesticide dosage is reduced, the investment is reduced, the prevention and treatment effect is improved, and the soil pollution is reduced.
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FIG. 1 is a plot of the distribution of the test areas of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the method for monitoring and controlling the potato late blight comprises the following steps:
s1: selecting test agents, wherein the concentrations of the test agents are 30% of flumorph, 52.5% of famoxadone-cymoxanil and 62.5% of silver farci;
s2: selecting test sites, selecting moderate soil fertility, gentle slope land, water and fertilizer conditions, covering potatoes with corns in the front crops, belonging to a frequently-occurring area of late blight, selecting three large test areas, dividing each large test area into five small test areas, wherein the small test areas are 40 square meters in area, 5 meters in width and 8 meters in length, the small test areas and the repeated walkways are 1 meter, and covering corns with potatoes in the periphery for protection;
s3: performing test area seeding
Potatoes of the variety 'Favorita' are respectively planted in five small areas of the three large areas, the planting density per mu is 4002 pits, the row spacing is 60 cm, the plant spacing is 33 cm, 10 rows are planted in each small area, 24 pits are planted in each row, 240 pits are planted in each small area, 33.2 kg of compound fertilizer 54% Shidanli N, P, K is applied to each mu, and 2500 kg of organic fertilizer is applied to each mu;
s4: the pesticide is applied, and the crops are sprayed with different pesticides regularly during the test period
Monitoring potatoes in real time by using a remote monitor, and spraying the potatoes once every 7 days for 4 times when the detector shows that the infection value of the third generation is 1.75;
the first spraying is a protective agent, and five small test areas in the three large test areas spray the protective agent respectively:
① diluting 500 times of flumorph, the dosage per mu is 45 ml, the dosage per test small area is 2.7 ml × 3 ═ 8.1 ml, and the dosage per test small area is 1.3 kg × 3 ═ 3.9 kg;
② diluting 900 times of Sendzein, 25 g for each mu, 1.5 g multiplied by 3 for each small area to be tested, 4.5 kg of water;
③, diluting famoxadone 1000 times, using 40 g per mu, 1.3 g multiplied by 3-3.9 g per small area tested, adding 3.9 kg of water;
④ diluting 600 times of Yinfari, using 75 ml per mu, using 4.5 ml multiplied by 3 to 13.5 ml per small area tested, adding 4 kg of water;
⑤ mu is sprayed with 22.23 kg of clean water, and each test small area is sprayed with 1.3 kg of water multiplied by 3 which is 4.9 kg of water;
the last three sprays are therapeutic agents, and five small test areas in the three large test areas spray the therapeutic agents respectively:
① diluting 622 times of flumorph, wherein the dosage per mu is 45 ml, the dosage per test small area is 2.7 ml × 3 ═ 8.1 ml, the dosage per test small area is 1.74 kg × 3 ═ 5.22 kg of water, and the water is 5.22 kg;
②, diluting famoxadone 700 times, using 40 g per mu, using 2.4 g multiplied by 3 (7.2 g) per small area of the test, and adding 5.22 kg of water;
③, diluting famoxadone 700 times, using 40 g per mu, using 2.4 g multiplied by 3 (7.2 g) per small area of the test, and adding 5.22 kg of water;
④ diluting 373 times of Yinfari, using 75 ml per mu, using 4.5 multiplied by 3 to 13.5 g per small area tested, adding 5.22 kg of water;
⑤ mu is sprayed with 28 kg of clean water, and each test small area is sprayed with 5.22 kg of water multiplied by 3 which is 15.66 kg of water;
when the remote monitor displays that the infection value of the 3 rd time is 7, spraying protective agents, wherein the protective agents sprayed in five test small areas in the three test large areas are respectively as follows:
① 1000-fold diluted flumorph suspension;
②, 900 times diluted mancozeb wettable powder and 1000 times diluted famoxadone-cymoxanil mixed solution;
③ 900 times diluted famoxadone and cymoxanil;
④ silver Fall 600 times diluted;
⑤ clear water;
after 7-10 intervals, starting to spray the therapeutic agent;
s5: sampling investigation, namely sampling each test area and recording disease plants and disease degree;
sampling at 5 points of the diagonal line of each test small area, wherein 2-3 plants are sampled at each point, and standard investigation is carried out by adopting a 5-level grading method;
level 0: no disease;
level 1: the diseased leaves account for less than 1/4 of the total leaves of the whole plant;
and 2, stage: the number of diseased leaves accounts for 1/4-1/2 of the total number of leaves of the whole plant;
grade 3, the diseased leaves account for 1/2-1/4 of the total leaves of the whole plant;
4, level: the whole plant leaves almost have scabs, most of the leaves die, and the leaves at the base part die;
before drug application, investigating the disease condition base number for the first time, investigating 3 times after drug application, investigating disease indexes 7 days after drug application for the first time, recording the current weather and temperature, investigating disease indexes 5-7 days after drug application for the second time, recording the current weather and temperature, investigating disease indexes 15 days after drug application for the third time, recording the current weather and temperature, selecting middle rows in each test small area, weighing 10 plants, and measuring the fresh weight of the plants;
s6: calculating the drug effect;
Figure BDA0002416903730000061
Figure BDA0002416903730000062
if the disease condition base number is investigated before the application, the prevention and treatment effect is calculated according to the following formula:
Figure BDA0002416903730000063
s7: yield evaluation is carried out, fresh weight is weighed for all harvest of each cell, the yield is converted into acre yield, and a yield result is measured to finally obtain the product with the highest yield of 52.5 percent famoxadone and cymoxanil used alone, the second place of a cymoxanil wheel used, the third place of a silver method used, the fourth place of a 30 percent flumorph suspending agent used alone and the lowest yield of clear water sprayed without spraying a pesticide;
in the test, the yield of the famoxadone and cymoxanil is the highest, the famoxadone and cymoxanil can be used as a first-choice medicament for preventing and treating potato late blight, and a 62.5% silver method suspending agent can be used in combination; the mancozeb has poor curative effect after the occurrence of central disease plants, and can only be used for protection and prevention before the disease occurs (the pesticide is sprayed when the infection of the third generation is 1.75); the yield of the 30% flumorph suspending agent is slightly higher than that of a control, the effect is not obvious, and the suspension can be eliminated.
According to the invention, the time and the disease incidence rule of initial infection of the potato late blight are mastered, the optimal prevention time of the potato late blight is mastered accurately, the optimal medicine and the dosage for preventing and treating the potato late blight are accurate, the pesticide dosage is reduced, the investment is reduced, the prevention and treatment effect is improved, and the soil pollution is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The method for monitoring and controlling the potato late blight is characterized by comprising the following steps of:
s1: selecting test agents, wherein the concentrations of the test agents are 30% of flumorph, 52.5% of famoxadone-cymoxanil and 62.5% of silver farci;
s2: selecting a test site, selecting moderate soil fertility, gentle slope land, and water and fertilizer conditions, wherein the former crops are all corn-potato packages, and belong to a frequently-occurring area of late blight;
s3: sowing in the test area;
s4: the pesticide is applied, and different pesticides are sprayed on crops periodically during the test period;
s5: sampling investigation, namely sampling each test area and recording disease plants and disease degree;
s6: calculating the drug effect;
s7: and (5) carrying out yield evaluation.
2. The method for monitoring and controlling potato late blight according to claim 1, wherein: in S2, three large test areas were selected, each divided into five small test areas.
3. The method for monitoring and controlling potato late blight according to claim 2, wherein: the area of the small test area is 40 square meters, the width and the length are respectively 5 meters and 8 meters, the walking path between the small test area and the repetition is 1 meter, and the potatoes are planted around and sleeved with corns for protection.
4. The method for monitoring and controlling potato late blight according to claim 1, wherein: in S3, potatoes of the variety 'Favorita' are planted in five small areas of the three large areas respectively, the planting density per mu is 4002 pits, the row spacing is 60 centimeters, the plant spacing is 33 centimeters, 10 rows are planted in each small area, 24 pits are planted in each row, 240 pits are planted in each small area, 33.2 kilograms of compound fertilizer 54% Shidanli N, P, K are applied to each mu, and 2500 kilograms of organic fertilizer is applied to each mu.
5. The method for monitoring and controlling potato late blight according to claim 1, wherein: in S4, the detector shows that the medicine is sprayed when the infection of the first generation and the second generation is 1.75, and the medicine is sprayed once every 7 days and 4 times continuously.
6. The method for monitoring and controlling potato late blight according to claim 5, wherein: the first time of spraying is the protective agent, the five small test areas in the three large test areas are respectively sprayed with flumorph diluted by 500 times, mancozeb diluted by 900 times, famoxadone diluted by 1000 times, silver ethephon diluted by 600 times and clear water, the last three times of spraying is the therapeutic agent, and the five small test areas in the three large test areas are respectively sprayed with flumorph diluted by 622 times, famoxadone diluted by 700 times, silver ethephon diluted by 373 times and clear water.
7. The method for monitoring and controlling potato late blight according to claim 5, wherein: when a remote monitor shows that the infection value of the 3 rd time is 7, spraying protective agents, wherein the protective agents sprayed in five small test areas in three large test areas are respectively a flumorph suspending agent diluted by 1000 times, a mancozeb wettable powder diluted by 900 times, a famoxadone and cymoxanil mixed solution diluted by 1000 times, famoxadone and cymoxanil diluted by 900 times, a silver farinaceous diluted by 600 times and clear water, and starting to spray the therapeutic agents after 7-10 intervals.
8. The method for monitoring and controlling potato late blight according to claim 1, wherein: in S5, the sampling method was 5 point samples per test small area diagonal, 2-3 plants per point, and 5-grade grading standard survey, grade 0: disease-free, grade 1: the diseased leaves account for 1/4 below of the total leaves of the whole plant, grade 2: the diseased leaves account for 1/4-1/2 of the total leaves of the whole plant, grade 3, the diseased leaves account for 1/2-1/4 of the total leaves of the whole plant, grade 4: the whole plant leaves almost have scabs, most of the leaves die, and the leaves at the base part die.
9. The method for monitoring and controlling potato late blight according to claim 8, wherein: before application, the disease condition base number of the first time is investigated, the disease index is investigated 3 times after application, the disease index is investigated 7 days after application for the first time, the current weather and temperature are recorded, the disease index is investigated 5-7 days after application for the second time, the current weather and temperature are recorded, the disease index is investigated 15 days after application for the third time, the current weather and temperature are recorded, the harvest time is reached, middle rows are selected in each small test area, and 10 plants are weighed and used for measuring the fresh weight of the crop.
10. The method for monitoring and controlling potato late blight according to claim 1, wherein: in S7, fresh weight is weighed for each district, the yield is converted into acre yield, and the yield result is measured to finally obtain the highest yield of 52.5 percent famoxadone and cymoxanil, the highest yield of 80 percent mancozeb and 52.5 percent famoxadone, the highest yield of cymoxanil wheel, the third position of Yinlu, the fourth position of 30 percent flumorph suspending agent, and the lowest yield of clear water without spraying pesticide and spraying.
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