GB2174601A

GB2174601A - Insecticides comprising fluvalinate and thiometon

Info

Publication number: GB2174601A
Application number: GB08610791A
Authority: GB
Inventors: Pierre Malbrunot
Original assignee: Sandoz AG
Current assignee: Sandoz AG
Priority date: 1985-05-07
Filing date: 1986-05-02
Publication date: 1986-11-12
Also published as: GR861131B; GB8610791D0; BE904659A; GB2174601B; NL8601135A; JPS61268607A; FR2581509B1; FR2581509A1; AU5710886A; ZA863432B

Abstract

A method of combating insects, particularly aphids, comprises applying to a locus, separately or together, fluvalinate and thiometon. A suitable composition comprises fluvalinate <IMAGE> and thiometon <IMAGE> in a weight ratio of, e.g., 0.5-1 to 1-3.

Description

SPECIFICATION Improvements in or relating to insecticides The present invention relates to insecticides.

It has been found that the use of a) the compound of formula I,

hereinafter referred to by the common name "fluvalinate", in association with b) the compound of formula II,

hereinafter referred to by the common name "thiometon", is particularly effective in combating insect pest, especially aphids.

Fluvalinate is a known insecticide effective in the control of insects in cotton crops, in vegetable crops and in tabacco crops (see for example French patent application No. 2 405 922 and European patent application No. 0 038 617). Thiometon is also a known insecticide used for the control of aphids. It has now been found, that the use of fluvalinate in combination with thiometon surprisingly and substantially enhances the effectiveness of the latter in combating such insects, especially aphids.

Accordingly, the invention provides an improved method of combating insects in a locus, which comprises applying to the locus, in admixture or separately, an insecticidally effective amount of fluvalinate of formula I and thiometon of formula II.

The method of the invention is useful for combating aphids and other pests of the order of hemipter. Particularly it is useful for the control of aphids in any crops, for example potato aphid (Myzus persicae and Macrosiphum euphorbiae), pea aphid (Arctisiphon pisi and Aphis fabae), cereal aphid, beet aphid, hop aphid (Phorodon humili), sunflower aphid, rape aphid, bean aphid, green peach aphid and market garden aphid, especially green peach aphid (Myzus persicae) and bean aphic (Aphis fabae).

The weight ratio of fluvalinate: thiometon is preferably of 0.5-1:1-3, more preferably of 0.6-0.8:1.5-2.5, most preferably of 0.72:2.

Suitable application rates are 0.030-0.060 kg preferably 0.035-0.045 kg per hectare of fluvalinate in admixture with 0.060-0.180 kg, preferably 0.090-0.150 kg per hectare of thiometon. Particularly good results are obtained against the aphids Myzus persicae and Aphis fabae by applying 0.432 kg per hectare of fluvalinate in admixture with 0. 120 kg per hectare of thiometon, e.g. by applying 0.500 or 0.600 1 per hectare of a formulation having a concentration of 72 g/l of fluvalinate and 200 g/l of thiometon.

The application of fluvalinate and thiometon, in admixture or separately, may be effected according to known methods and with usual apparatus.

The invention also provides an insecticidal composition comprising as active ingredients the compound of formula I and the compound of formula II.

In the composition of the invention, the weight ratio of fluvalinate: thiometon is preferably as defined above.

The composition of the invention may be employed in either solid or liquid forms e.g. in the form of a wettable powder or a emulsifiable concentrate incorporating conventional diluents.

Such compositions may be produced in conventional manner, e.g. by mixing the active ingredients with a diluent and optionally other formulating ingredients such as surfactants.

The term diluents as used herein means any liquid or solid agriculturally acceptable material which may be added to the active constituent to bring it to an easier or improved applicable form, respectively to a usable or desirable strength of activity. It can for example be talc, kaolin, diatomaceous earth, xylene, or water.

Liquid forms may include non-phytotoxic diluents such as alcohols, glycols, glycolic ethers, aliphatic and aromatic hydrocarbons, e.g. xylene, alkylnaphthalenes and other petroleum distillates, and ketones, e.g. cyclohexanone and isophorone. Adjuvants such as surface active agents, e.g. wetting and emulsifying agents such as polyglycol ethers formed by reaction of alkylene oxides with high molecular weight alcohols, mercaptans or alkyl phenols and/or alkylbenzene sulphonates may be included in emulsifiable concentrate forms. Adjuvants such as wetting agents, e.g. condensation products or formaldehyde with naphthalene sulphonate, an alkylarylsulphonate or a lignin sulphonate, may be included in wettable powders to be applied as an aqueous suspension.

The composition of the invention may also be formulated in the form of a twin packet.

In general, the formulations include from 0.1 to 90% by weight of active agents, from 0 to 20% by weight of agriculturally acceptable surfactant and 99.99% to 10% by weight of diluent(s), the active agents consisting of the compound of formula I and the compound of formula II, preferably in the weight ratio as defined above.

Concentrate forms of compositions generally contain between about 2 and 90%, preferably between about 5 and 70% by weight of active agents. Application forms of formulation may for example contain from 0.1 to 20% by weight, preferably from 0.1 to 5% by weight of active agents.

Aside from the above mentioned carriers, diluents and adjuvants, other additives such as stabilizing agents, deactivators, surface adhesion improvers, anti-corrosives, defoaming agents and pigments may also be included.

The invention is illustrated by the following Examples in which all parts and pourcentages are by weight.

Example 1 85 parts of fluvalinate and 210 parts of thiometon are mixed with 60 parts of isooctylphenyl decaglycol ether and 20 parts of the calcium salt of an alkyl-aryl-sulphonate and 625 parts of xylene. The thus obtained emulsifiable concentrate may be diluted with water to the desired concentration prior to use.

Example 2 20 parts of the calcium salt of an alkyl-aryl-sulphonate and 33 parts of nonylphenylpolyglycol ether are added to 412 parts of an aromatic petroleum fraction having a boiling point of 156-178"C and the mixture is stirred until a homogeneous solution is obtained. 30 parts of a commercial stabilizer are added and then 400 parts of thiometon (50%) and 80 parts fluvalinate (90%) and the mixture is thoroughly mixed until a homogeneous solution is obtained. The thus obtained emulsifiable concentrate may be diluted with water to the desired concentration prior to use.

Application Examples The activity of the new combination in controlling aphids is shown in tests carried out on beet plots. In these tests, 0.500 or 0.600 I/ha of an emulsifiable concentrate prepared according to Example 1 or 2 and comprising 72 g/l of fluvalinate and 200 g/l of thiometon has be sprayed.

The application is carried out a the beginning of the infestation, i.e. 1 green peach aphid (Myzus persicae) for 2 beets and 20 to 30% of the beets infested by bean aphids (Aphis fabae).

The evaluation of aphids has been effected on 20 or 25 beets by plot, before application and 2, 7, 14, 21 and 28 days later. The results are reported in the following tables. In the tables M means Myzus persicae and A means Aphis fabae.

Test A (Table a) The test was carried out on the variety Masabel at the stade of 10 leaves. At the beginning, 36 green peach aphids were present for 25 beets and 6 bean aphids were present for 25 beets.

Table a

Dose .Average number of aphids for 25 beets after application ( in days) M A M A M A M A Untreated 22 2.3 14 6.3 2.3 3.5 0.5 7.8 0,51/ha 6 1.3 1.5 1.3 0 1 0 4.5 Test B (Table b) The test was carried out on the variety Arigo mono at the stade of 8-12 leaves. The beets were artificially infested by a supply of 4 aphids for 5 beets.

Table b

Average number of aphids for 25 Dose beets after application (in days) 2 7 14 21 M A M A M A M A Untreated 36 115 36 186 20 339 16 47 36 186 20 339 16 47 0.5 l/ha 0.5 6 0.5 4 1 73 1.3 64 Test C (Table c) The test was carried out on the variety Haweduca at the stade of 8-10 leaves. At the beginning, 299 bean aphids were present for 25 beets.

Table c

Dose Average number of aphids for 25 beets after application (in days) 2 7 14 21 A A A A Untreated 305 607 1070 2578 0.5 l/ha 8 32 181 715 Test D (Table d) The test was carried out on the beet variety Virtus at the stade of 4-6 leaves. The average number of green peach aphids and bean aphids for 20 beets before application was 52,5 and 1 respectively.

Table d

Average number of aphids for 20 beets Dose after application (in days) 2 .7 14 21 28 M A M A M A M A M A Untreated 49.5 4 44,5 2.5 184 20;;7 464 14.5 519 16.2 0.5 1 21.8 3 24.5 2.2 58.0 8.5 69.5 4,0 107 5,2 0.6 1/ha 6.0 0.5 9.0 1.2 15.5 2.5 42.8 1.5 77 4.7 Test E (Table e) The test was carried out on the beet variety Donor at the stade of 6-8 leaves. The plants were infested principally by green peach aphids (on average 27.5 for 20 beets before applications). During 15 days, the aphid green peach aphid population increased as well as for bean aphids which appeared after 15 days.

Table e

Dose Average number of aphids for 20 beets after application (in days) 2 8 15 21 28 Untreated 27.3 - 105.8 - 278 28.2 75.8 50.5 12.5 0.5 1/ha 20 0 9.3 15.3 13.0 4.8 25.2 2.8 - 0.6 1/ha 1,0 - 1,0 - 12.3 2.0 2,5 9.7 4.5 - Test F (Table f) The test was carried out on the beet variety Monohil at the stade of 6-8 leaves.The average number of green peach aphids and bean aphids before application was 3.0 and 38.5 respectively. 15 days after treatment, the aphids disappeared.

Table f

Average number of aphids for 20 beets Dose after application (in days) 2 7 15 M A M A M A Entreated 6.2 7.3 6.8 16.3 67.7 24. 3 0.5 1/ha 0.2 0.0 4.8 2.0 18.2 12.8 0.6 l/ha 0.2 0 3 0.5 0.8 10.7 12.5 Test G (Table g) The test was carried out on the beet variety Monosvalof at the stade of 6-8 leaves.Before application, the average number of green peach aphids and bean aphids for 20 beets was 11.2 and 37.5 respectively.

Table g

Average number of aphids for 20 beets Dose after application (in days) 2 7 15 21 0.5 1/ha 0.5 0.8 : 0.3 0.0 0.3 33.6 23.8 23.7 0.6 1/ha 0.0 1 0.3 1 0.5 0 5 o.3 ! 20.6 28.5 28.5 Test H (Table h) The test was carried out on the beet variety Virtus at the stade of 2-4 leaves. The average number of green peach aphids before application was 12 for 20 beets.

Table h

Dose Average number of aphids for 20 beets after application (in days) 2 7 15 21 28 M A M A M A M A 0.5 1/ha 4.0 8.8 2.5 1.3 0.2 0.8 0.5 6.5 3.3 16.0 0.6 I/ha 1,5 1.5 2.7 0.2 0 0.2 1.5 0.7 3.5 4.7 24.0 No phytotoxicity symptom has been noted in the above tests A to H.

Claims

1. A method of combating insects in a locus which comprises applying to the locus, in admixture or separately, an insecticidally effective amount of a) the compound of formula I

in association with b) the compound of formula II

2. A method according to claim 1, wherein the weight ratio compound of formula I: compound of formula II is 0.5-1: 1-3.

3. A method according to claim 2, wherein the weight ratio compound of formula I: compound of formula 11 is 0.6-0.8: 1.5-2.5.

4. A method according to claim 3, wherein the weight ratio compound of formula I: compound of formula II is 0.72:2.

5. A method according to claim 1 to 4, wherein the compound of formula I and the compound of formula II are applied at a rate of 0.030-0.060 kg/ha and 0.060-0.180 kg/ha respectively.

6. A method according to claim 5, wherein the compound of formula I and the compound of formula II are applied at a rate of 0.035-0.045 kg/ha and 0.090-0.150 kg/ha respectively.

7. A method according to claim 6, wherein the compound of formula I and the compound of formula Il are applied at a rate of 0.432 kg/ha and 0.120 kg/ha respectively.

8. A method according to anyone of claims 1 to 7, wherein the locus is a potato, sunflower, pea, cereal, beet, hop, rape or market garden locus.

9. A method according to anyone of claims 1 to 8, wherein the insects are aphids.

10. A method according to claim 9, wherein the aphids are potato aphid, sunflower aphid, pea aphid, rape aphid, cereal aphid, beet aphid, hop aphid, bean aphid, green peach aphid or market garden aphid.

11. A method according to claim 10, wherein the aphids are bean aphid or green peach aphid.

12. An insecticidal composition comprising as active ingredients the compound of formula I and the compound of formula II as defined in claim 1.

13. A composition according to claim 12, wherein the weight ratio compound of formula I: compound of.formula II is 0.5-1: 1-3.

14. A composition according to claim 13, wherein the weight ratio compound of formula l: compound of formula II is 0.6-0.8: 1.5-2.5.

15. A composition according to claim 14, wherein the weight ratio compound of formula I: compound of formula II is 0.72:2.

16. A composition according to anyone of claims 12 to 15, containing from 0.1 to 90% of the compounds of formula I and II.