FR2596248A1 - PROCESS FOR TREATING COTTON PLANTS INFECTED OR LIKELY TO BE INFECTED WITH BEMISIA TABACI USING BUTOCARBOXIME - Google Patents

Abstract

THE INVENTION CONCERNS THE FIELD OF INSECTICIDES AND REFERS TO A PROCESS FOR THE TREATMENT OF COTTON PLANTS INFESTED OR LIKELY TO BE INFESTED BY TOBACCO WHITE FLY (BEMISIA TABACI) CONSISTING OF TREATING THEM WITH AN EFFECTIVE DOSE OF BUTOCARBOXIME BUTOCARBOXIME. THE SOIL OF AN AQUEOUS EMULSION AT A RATIO OF 0.5 TO 10 KGHA.

Description

The present invention relates to a method for treating seedlings of

  cotton infested or likely to be infested with the white tobacco fly (Bemisia Tabaci) consisting of treating them with an effective dose of butocarboxime. STATE OF THE ART It is known that the tobacco fly, also called Bemisia Tabaci, is a particularly harmful parasite for the development of cotton plants and the quality of the harvested fiber. In order to fight against this scourge it is already known to use the insecticide commonly called butocarboxime whose official name is methylthio-3-O - [(methylamino) carbonyl] oxime butanone-2 and whose structural formula is: 15

S - CH3

CH3 -C -CH2 - CH3

II

NOT

C - NH - CH3

he

0

  This compound is described in US Patent 3,816,532.

  It is a systemic insecticide active against

  white tobacco flies that infest the plants of 30 cotton plants.

  Aims of the invention One of the aims of the invention is to provide a process having improved efficiency with regard to

  concerns the treatment of cotton plants infested or likely to be infested with white tobacco fly.

  Another object of the invention is to provide a simplified process which does not require mechanical intervention ensuring the incorporation into the soil of the insecticide product. A third object of the invention is to provide a method making it possible to avoid the application of an excessive dose of butocarboxime, both economically and phytotoxically.

  General description of the invention.

  The goals listed above are achieved by a treatment process characterized in that the butocarboxime is applied to the soil of a crop of

  cotton plants at a rate of 0.5 to 10 kg / ha.

  Preferably, the butocarboxime will be applied to the soil at a rate of 1 to 4 kg / ha and without specific operation of incorporation into the soil and advantageously between

2 and 4 kg / ha.

  For its practical use butocarboxime is rarely used alone. Most often it is part of a liquid or solid composition which contains, as active material, butocarboxime in combination with liquid or solid supports and surfactants acceptable in agriculture. In particular are usable

  inert supports and usual surfactants.

  By the term "support", in the present description, is meant an organic or mineral, natural or synthetic material, with which the active material is associated to facilitate its application to the plant, to seeds or to the soil. This support is therefore generally inert and it must be acceptable in agriculture, in particular on the treated plant. The support can be solid (clays, natural or synthetic silicates, silica, resins, waxes, solid fertilizers, etc.) or liquid (water, alcohols, ketones, petroleum fractions, aromatic or paraffinic hydrocarbons, chlorinated hydrocarbons, gases

liquefied, etc.).

  The surfactant can be an emulsifying, dispersing or wetting agent of ionic or nonionic type. Mention may be made, for example, of salts of polyacrylic acids, salts of lignosulfonic acids, salts of phenolsulfonic or naphthalene sulfonic acids, polycondensates of ethylene oxide on fatty alcohols or on fatty acids or on fatty amines , substituted phenols (especially alkylphenols or arylphenols), ester salts of sulfosuccinic acids, taurine derivatives (especially alkyltaurates), phosphoric esters of polyoxyethylated alcohols or phenols. The presence of at least one surfactant is generally essential when the active material

  and / or the inert carrier is not soluble in water and the carrier agent for the application is water.

  For its application, butocarboxime is therefore generally in the form of compositions; these compositions according to the invention are themselves under

  fairly diverse forms, solid or liquid.

  As forms of solid compositions, mention may be made of powders for dusting or dispersion (with a content of compound of formula (I) which can range up to 100%) and

  granules, in particular those obtained by extrusion, par_-.

  compacting, by impregnation of a granulated support, by granulation from a powder (the content of compound of formula (I) in these granules being between 1 and 80% for

these latter cases).

  As forms of liquid compositions or intended to constitute liquid compositions during application, mention may be made of solutions, in particular water-soluble concentrates, emulsifiable concentrates, emulsions, concentrated suspensions, aerosols, wettable powders (or powder

spray), the pasta.

  The emulsifiable or soluble concentrates most often comprise 10 to 80% of active material, the emulsions or solutions ready for application containing, for their part, 0.01 to 20% of active material. In addition to the solvent, emulsifiable concentrates can contain, when necessary, 2 to 20% of suitable additives, such as stabilizers, surfactants, penetrating agents,

  corrosion, dyes, adhesives.

  Preferably the butocarboxime will be in the form of an emulsifiable concentrate (CE) and during the treatment the concentrate will be diluted with water. The composition will comprise, for example, from 5 to 100 g / l of butocarboxime. More preferably, the emulsifiable concentrate is applied by spraying onto the ground and advantageously in

only once.

  This last variant constitutes a mode

  particularly preferred to use given the economy which it allows to achieve.

  The example below illustrates the invention without, however, limiting it: An aqueous emulsion known under the brand name DRAWIN 755 (R) marketed by the German company WACKER. DRAWIN 755 contains 500 g of butocarboxime per liter. The product is mixed with water so that for 50 l of emulsion there are respectively 15 g / l (emulsion A), 22.5 g / l (emulsion B), 30 30 g / 1 (emulsion C) which corresponds in identical spreading conditions respectively to 1.80 kg ai / ha (A), 2.70 kg ai / ha (B), 3.50 kg ai / ha (C) (ma means material active). The plots are different for the application of doses A, B, C but similar. 35

  Before spraying the average plant infestation was 645 Bemisia / 100 leaves. We then count the number of Bemisia remaining on day D + n.

  The results are shown in the following table: Number of Bémisia Tabaci adults per 100 leaves 1 A

1 1 I I

I I

I A I

1 1

IBI1

I CI 15 I I

-

D +2 1

511 I 342 285

-

D + 4 I 333 I

229 I

I I

3 + 61 D + 6

500 220 215

-

0 + 81 D + 8

494 1,298 I 374 I

  - Average on I D + 1012 at 10 daysl

I I

719 1,511

1 1

788 i 375

2 1,552 1,318 1

I,

  We stop the treatment while restarting it. The results are shown in the table below.

8 days and are indicated in the

I 3 + 181 J + 201 3 + 221 J + 241

  I A I 260 1,433 1,407 1,391 1 25 1 1 1 J I I

I B I 288 1 382 1 351 I 341

C I 177 1 280 1 358 1 307 30

Imoyenne J + 26118 - 26 I

395 1,377

I

475 1,367

551,335

551 1,335

  I between days I a - I I We stop the treatment for 2 days and we start it again. The results are shown below:

I I J + 301 J + 321 J + 341 J + 361

I I I I I I

1 TO 1398 | 483 I 635 | I

1 1 1 1 1 1

I B 1 315 1 261 1 390 1

I C I 360 1,266 1,342 1 i

1 1 1 1 1 I

- Imoyenne J + 38 130 - 38

  728 I 561 441 I 352 379 I 537 379 1 337

  between days I I I I A foliar spray in three doses each equal to one third of the doses A, B, C respectively gives

  equivalent or lower results under the same operating conditions.

  Furthermore, these results are equivalent to those obtained with aldicaroe which is the reference insecticide in this area but which has a non-negligible toxicity for living warm-blooded beings. 20

Claims (4)

  1) Process for treating cotton plants infested or liable to be infested with the white tobacco fly (Bemissia Tabaci) consisting of treating them with an effective dose of butocarboxime, characterized in that the butocarboxime is applied to the soil of a culture   cotton plants at a rate of 0.5 to 10 kg / ha.   2) Treatment method according to claim 1, characterized in that the butocarboxime is applied at a rate of 1 to 4 kg / ha and without special operation incorporation into the soil.   3) Treatment method according to one of claims 1   or 2, characterized in that the butocarboxime is   applied in the form of an emulsifiable concentrate.   4) Treatment method according to claim 3, characterized in that the emulsion is applied by spraying. ) Treatment method according to claim 4, characterized in that the emulsion is applied in one one time.