GB2190292A - Controlling tobacco whitefly in cotton seedlings - Google Patents
Controlling tobacco whitefly in cotton seedlings Download PDFInfo
- Publication number
- GB2190292A GB2190292A GB08707570A GB8707570A GB2190292A GB 2190292 A GB2190292 A GB 2190292A GB 08707570 A GB08707570 A GB 08707570A GB 8707570 A GB8707570 A GB 8707570A GB 2190292 A GB2190292 A GB 2190292A
- Authority
- GB
- United Kingdom
- Prior art keywords
- compound
- tobacco whitefly
- soil
- formula
- seedlings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION 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
- A01N47/00—Biocides, 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
- A01N47/08—Biocides, 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
- A01N47/10—Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof
- A01N47/24—Carbamic acid derivatives, i.e. containing the group —O—CO—N<; Thio analogues thereof containing the groups, or; Thio analogues thereof
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- Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Tobacco whitefly (Bemisia tabaci) in cotton seedlings are controlled by applying to the soil in which the seedlings are growing, at a rate of 0.5 to 10 kg/ha, a compound of the formula: <IMAGE> wherein n is 0, 1 or 2.i
Description
SPECIFICATION
A method for controlling tobacco whitefly in cotton seedlings
The present invention relates to a method for treating cotton seedlings infested with, or susceptible to infestation with, tobacco whitefly (Bemisia tabaci).
It is known that tobacco whitefly, also known as Bemisia tabaci, is a pest which is particularly harmful to the development of cotton seedlings and to the quality of the fibre harvested. In order to control this pest, the use is already known of the insecticide commonly called butocarboxim, the official name of which is 3-(methylthio)-2-butanone O-[(methylamino)carbonyl]-oxime, or one of its oxidized forms, of the structural formula:
wherein n=O, 1 or 2.
This compound is described in US Patent 3,816,532. It is a systemic insecticide active against tobacco whiteflies which infest cotton seedlings.
The present invention seeks to provide a method which is more effective than known methods in the treatment of cotton seedlings infested with or susceptible to infestation with tobacco whitefly.
The invention also seeks to provide a simplified method which does not require the use of machinery to control the incorporation of the insecticidal product into the soil and which makes it possible to avoid the application of an excessive dose of butocarboxim both from an economic point of view and a phytotoxic point of view.
It has been discovered that application of butocarboxim or an oxidised derivative thereof to the soil in which a cotton crop is grown permits control of tobacco whitefly to be achieved at a rate of application of 0.5 to 10kg/ha without the need to incorporate the active compound into the soil.
The present invention accordingly provides a method of controlling the infestation by tobacco whitefly (Bemisia tabaci) of cotton seedlings infested with, or subject to infestation with, tobacco whitefly which comprises applying to the soil in which the seedlings are growing a compound of general formula I, wherein n is 0, 1 or 2, at a rate of 0.5 to 10 kg/ha.
Preferably, the compound of formula (I) is applied to the soil at a rate of 1 to 4 kg/ha, advantageously from 2 to 4 kg/ha, without any specific operation of incorporation into the soil.
The compound of formula (I) will generally be used in the form of a solid or liquid composition which comprises, as active ingredient, a compound of formula (I) in association with an agriculturally acceptable carrier or diluent and/or surfactant. The usual inert carriers and surfactants may, in particular, be used.
In the present specification, the term "carrier" denotes an organic or inorganic, natural or synthetic material which is in combination with the active substance in order to facilitate its application to the soil. This carrier is therefore generally inert and it must be acceptable in agriculture, especially on the plant treated. The carrier may be solid (eg. clays, natural or synthetic silicates, silica, resins, waxes or solid fertilizers), or liquid (eg. water, alcohols, ketones, petroleum fractions, aromatic or paraffinic hydrocarbons, chlorinated hydrocarbons, and liquefied gases).
The surfactant may be an emulsifier, dispersant or wetting agent of ionic or nonionic type.
There may be mentioned, e.g., salts of polyacrylic acids, salts of lignosulphonic acids, salts of phenolsulphonic or naphthalenesulphonic acids, polycondensates of ethylene oxide with fatty alcohols or fatty acids or fatty amines, substituted phenols (especially alkylphenols or arylphenols), salts of sulphosuccinic acid esters, taurine derivatives (especially alkyltaurates), and phosphoric acid esters of polycondensates of ethylene oxide with alcohols or phenols. The presence of at least one surfactant is generally indispensable when the active substance and/or the inert carrier are not water-soluble and the vector agent for the application is water.
For its application, butocarboxim is generally in the form of compositions; these compositions according to the invention are themselves in fairly diverse, solid or liquid forms.
As solid forms of compositions, there may be mentioned powders for dusting or scattering (with a content of the compound of formula (I) which may range up to 100%) and granules, especially those obtained by extrusion, by compacting, by impregnation of a granulated carrier, or by granulating starting from a powder (the content of the compound of formula (I) in these granules being between 1 and 80% in the latter cases).
As liquid forms of compositions, or forms designed to constitute liquid compositions when applied, there may be mentioned solutions, especially water-soluble concentrates, emulsifiable concentrates, emulsion, flowables, aerosols, wettable powders (or powder for spraying) and pastes.
The emulsifiable or soluble concentrates generally contain 10 to 80% of active substance, whereas the emulsions or solutions ready for application contain, for their part, 0.01 to 20% of active substance. In addition to the solvent, the emulsifiable concentrates may contain, when required, 2 to 20% of suitable additives such as stabilizers, surfactants, penetrants, corrosion inhibitors, colourings and adhesives.
Butocarboxim in the form of an emulsifiable concentrate (EC) is preferably used, the concentrate being diluted with water at the time of application. The composition applied to the soil preferably comprises from 5 to 100 g/l of butocarboxim.
The diluted emulsifiable concentrate is preferably applied to the soil by spraying, advantageously in a single application at a rate sufficient to secure a prolonged effect: this variant forms a particularly preferred embodiment, in view of the savings achieved in comparison with a plurality of applications by foliar spraying which may be required to achieve the same level of control.
The following Example illustrates the invention. An aqueous emulsion known under the trade name DRAWIN 755 (R), marketed by the German company WACKER, is diluted with water and then sprayed in a single application to the soil in which cotton seedlings are grown. DRAWIN 755 contains 500 g of butocarboxim per litre. The product is mixed with water so that in 50 1 of emulsion there are 15 g/l (emulsion A), 22.5 g/l (emulsion B) and 30 g/l (emulsion C) respectively, which, under identical conditions of application, correspond to 1.80 kg a.s./ha (A), 2.70 kg a.s./ha (B) and 3.50 kg a.s./ha (C) respectively (a.s. means active substance). The plots to which doses A, B and C are applied are different, but similar in the level of infestation.
Before spraying, the mean level of infestation of the seedlings was 645 Bemisia/100 leaves.
The number of Bemisia remaining is then counted on day D+n.
The results are given in the following table:
Number of adult Bemisia tabaci per 100 leaves
mean over D + 4 D + 6 D + 8 0 + 10 days 2 to 10 333 500 494 719 511 B 342 229 220 298 788 375 C 285 165 215 374 552 318 The treatment is discontinued for 8 days and started again. The results are given in the table below:
mean over D + 18 D + 20 D + 22 D + 24 D + 26 days 18 - 26 A 260 433 407 391 395 . 377 B 288 382 351 341 475 367 C 177 280 358 307 551 335 The treatment is discontinued for 2 days and started again. The results are given below:
mean over D + 30 D + 32 0 + 34 D + 36 D + 38 days 30 - 38 A 398 483 635 728 561 B 315 261 390 441 352 C 360 266 342 379 337 A foliar spraying in three doses, each equal to a third of the doses A, B and C respectively, gives equivalent or poorer results under the same operating conditions.
Moreover, these results are equivalent to those obtained with aldicarb, which is the reference insecticide in this field, but which has a not insignificant toxicity to warm-blooded living beings.
Claims (6)
1. A method of controlling the infestation by tobacco whitefly (Bemisia tabaci) of cotton seedlings infested with, or subject to infestation with, tobacco whitefly which comprises applying to the soil in which the seedlings are growing a compound of the formula:
wherein n is 0, 1 or 2, at a rate of 0.5 to 10 kg/ha.
2. A method according to claim 1 wherein the compound of formula I is applied at a rate of 1 to 4 kg/ha and without incorporation of the compound into the soil.
3. A method according to claim 1 or 2, wherein the compound of formula I is applied in the form of an aqueous emulsion.
4. A method according to claim 3, wherein the aqueous emulsion is applied by spraying.
5. A method according to claim 4, wherein the aqueous emulsion is applied in a single application to obtain prolonged control of infestation.
6. A method according to claim 1 substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8604814A FR2596248B1 (en) | 1986-04-01 | 1986-04-01 | PROCESS FOR TREATING COTTON PLANTS INFECTED OR LIKELY TO BE INFECTED WITH BEMISIA TABACI USING BUTOCARBOXIME |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8707570D0 GB8707570D0 (en) | 1987-05-07 |
| GB2190292A true GB2190292A (en) | 1987-11-18 |
| GB2190292B GB2190292B (en) | 1990-08-15 |
Family
ID=9333874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8707570A Expired - Lifetime GB2190292B (en) | 1986-04-01 | 1987-03-30 | A method for controlling tobacco whitefly in cotton seedlings |
Country Status (5)
| Country | Link |
|---|---|
| FR (1) | FR2596248B1 (en) |
| GB (1) | GB2190292B (en) |
| IL (1) | IL82028A (en) |
| TR (1) | TR23031A (en) |
| ZW (1) | ZW6187A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2036491C3 (en) * | 1970-07-23 | 1978-04-13 | Consortium Fuer Elektrochemische Industrie Gmbh, 8000 Muenchen | Ketoxime carbamate-based pesticide |
-
1986
- 1986-04-01 FR FR8604814A patent/FR2596248B1/en not_active Expired - Lifetime
-
1987
- 1987-03-27 IL IL82028A patent/IL82028A/en unknown
- 1987-03-30 ZW ZW61/87A patent/ZW6187A1/en unknown
- 1987-03-30 GB GB8707570A patent/GB2190292B/en not_active Expired - Lifetime
- 1987-04-01 TR TR235/87A patent/TR23031A/en unknown
Non-Patent Citations (6)
| Title |
|---|
| CHEMICAL ABSTRACTS 100(3):19141B * |
| CHEMICAL ABSTRACTS 101(21):186115Y * |
| CHEMICAL ABSTRACTS 102(17):144680U * |
| CHEMICAL ABSTRACTS 103(7):49742C * |
| CHEMICAL ABSTRACTS 105(5):37461P * |
| CHEMICAL ABSTRACTS 92(21):175712K * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2596248B1 (en) | 1990-04-27 |
| IL82028A (en) | 1992-05-25 |
| ZW6187A1 (en) | 1987-10-28 |
| IL82028A0 (en) | 1987-10-20 |
| GB8707570D0 (en) | 1987-05-07 |
| FR2596248A1 (en) | 1987-10-02 |
| GB2190292B (en) | 1990-08-15 |
| TR23031A (en) | 1989-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930330 |