GB2167960A

GB2167960A - Dressing seeds with pesticidal triamino triazines

Info

Publication number: GB2167960A
Application number: GB08529739A
Authority: GB
Inventors: Victor Fluck
Original assignee: Ciba Geigy AG
Current assignee: Novartis AG
Priority date: 1984-12-06
Filing date: 1985-12-03
Publication date: 1986-06-11
Also published as: IL77220A; GB2167960B; ZA859318B; AU580357B2; MY101802A; GB8529739D0; CH660110A5; JPS61140505A; AU5079385A; PH23552A

Abstract

A method of protecting seeds or parts of plants developing therefrom against phytopathogenic pests, comprises treating the seeds with 2,4,6-triamino-1,3,5-triazines of formula <IMAGE> wherein R1 is cyclopropyl or isopropyl.v

Description

SPECIFICATION Pesticidal triazines The present invention relates to a method of using 2,4,6-triamino-1 ,3,5-triazines for treating parts of plants which are put into the soil, such as tubers, bulbs or seed grain (seeds of cultivated plants) for protecting said seeds, and parts of plants developing from them, against attack by phytopathogenic pests.

The 2,4,6-triamino-1 3,5-triazines eligible for use in the practice of this invention are characterised by the formula

wherein R, is cyclopropyl (compound A) or isopropyl (compound B).

Compound A of formula I, wherein R1 is cyclopropyl, is disclosed in German Offenlegungsschrift 2 736 876, and compound B of formula I, wherein R, is isopropyl, is disclosed in J. Med. Chem. 10(1967), 457, as insecticide.

Surprisingly, it has now been found that, after treating seeds with the two compounds of formula I, not only seeds of cultivated plants, such as tubers, bulbs or seed grain, but also the parts of plants developing from them, are accorded long-term protection against damage caused by eating and sucking insects or representatives of the order Acarina.

Accordingly, the present invention relates to a method of using 2,4,6-triamino-1,3,S4riazines of formula I for controlling insects and representatives of the order Acarina, which comprises pretreating the seeds of useful plants, in particular of cotton and rice, with a compound of formula I.

It has been found that seed dressing is a particularly useful method of treating the seeds. The compounds of formula I can be added in the form of solid or liquid formulations to a seed dressing apparatus. The seed dressing operation is usually considered as completed when the active ingredient has been uniformly distributed on the seeds in the specified concentration.

Depending on the per se known method of treating (dry, moist, wet or slurry dressing as well as pelleting), treatment of 100 kg of seeds is effected with 1 to 50 kg of a solid or liquid formulation which contains 5 to 75% of a compound of formula I. The conventional solid or liquid formulations of compounds of formula I can be used for the seed dressing.

Formulation Examples (throughout, percentages are by weight) a) Wettable powders a) b) c) d) compound of formula 1 25% 50% 75% 25% sodium lignosulfonate 5% 5% - - sodium laurylsulfate 3% - 5% 3% sodium diisobutylnaphthalenesulfonate - 6% 10% nonylphenol polyethylene glycol ether (7-35 moles of ethylene oxide) - 2% - highly dispersed silicic acid 5% 10% 10% 3% bentonite 67% 27% - table salt - - - 69% The active ingredient is thoroughly mixed with the adjuvants and the mixture is thoroughly ground in a suitable mili, affording wettable powders which can be diluted with water to give suspensions of the desired concentration.

b) Suspension concentrate compound of formula 1 40% ethylene glycol 10% nonylphenol polyethylene glycol ether (15 moles of ethylene oxide) 6% sodium lignosulfonate 10% carboxymethylcellulose 1% 37% aqueous formaldehyde solution 0.2% silicone oil in the form of a 75% aqueous emulsion 0.8% water 32% The finely ground active ingredient is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired concentration can be obtained by dilution with water.

c) Granulate a) b) compoundofformulal 5% 10% kaolin 94% highly dispersed silicic acid 1% attapulgite - 90% The active ingredient is dissolved in methylene chloride and the solution is stranged onto the carrier.

The solvent is then evaporated off in vacuo.

d) Emulsifiable concentrate a) b) compound offormula 1 10% 10% nonylphenol polyethylene glycol ether (545 moles of ethylene oxide) 3% calcium dodecylbenzenesulfonate 3% castor oil polyglycol ether (36 moles of ethylene oxide) 4% castor oil thioxilate - 25% cyclohexanone 30% butanol - 15% xylenemixture 50% ethyl acetate 50% Emulsions of any required concentration can be obtained from this concentrate by dilution with water.

The following Examples further illustrate the present invention.

EXAMPLE 1 In a glass bottle, 100 g of cotton seeds are dressed with a 10% emulsifiable concentrate of compound A by rotating and shaking the bottle. The amount of dressing is 2 g and 5 g respectively of compound A per 100 g of cotton seeds.

Cotton seeds which have been treated with 2% and 5% of compound A are sown in pots. Three cotton plants in the 3--4 leaf stage which have been grown from these seeds in a greenhouse at 250-300C are populated with 20 freshly hatched Spodoptera littoralis larvae in the L1 stage in a 20 litre container. The container is then covered with a cloth. A count of living and dead Spodoptera littoralis larvae present on the cotton plants is made 4 days after infestation.

TABLE 1 Percentage mortality of Spodoptera littoralis larvae on cotton plants which have been grown from seeds dressed with compound A Evaluation made 4 days after populating the cotton plants with L, larvae of Spodoptera littoraiis

Seed dressing with compound Mortality | damage on (%) Living larvae Stage (%) cotton plants 2% 5 L2 75 | appreciably reduced compared with control 5% 2 L2 90 appreciably | | reduced compared with control control 20 j L2 0 severe EXAMPLE 2 In a glass bottle, 100 g of rice seeds are dressed with a 10% emulsifiable concentrate of compound A by rotating and shaking the bottle. The dressing contains 2% of compound A per 100 g of rice seeds.

Rice seeds which have been treated with 2% of compound A are sown in pots. Two weeks after emergence, the rice plants grown from the dressed seeds are infested at weekly intervals with nymphs of Nilaparvata lugens (N3). Each plant is populated with 20 nymphs. A count is made of living and dead rice cicadas present on the rice plants 5--8 days after infestation.

TABLE 2 Percentage mortality of Nilaparvata lugens (N3) on rice plants which have been grown from seeds dressed with 2% of compound A Percentage mortality 5 days after Postemergence infestation infestation (2 replicates) 2nd week 60/70 3rd week 60/70 4th week 50/40 5th week 100/90 6th week 80/90 7th week 100/80 control 0/0

Claims

1. A method of protecting seeds and parts of plants developing therefrom against attack by phytopathogenic pests, which comprises treating said seeds with a pesticidally effective amount of a 2,4,6 triamino-1,3,5-triazine of formula

wherein R, is cyclopropyl or isopropyl.

2. A method according to claim 1, which comprises dressing tubers, bulbs and seed grain of cultivated plants with a pesticidally effective amount of a compound of formula

to protect said seeds, and parts of plants developing therefrom, against attack by insects and representatives of the order Acarina.

3. A method according to claim 2, which comprises dressing cotton and rice seeds with a pesticidally effective amount of a compound of formula

to protect said seeds, and parts of plants developing therefrom, against attack by insects.

4. Method of protecting seeds and parts of plants developing therefrom according to claim 1 substantially as described with reference to any of the Examples.

5. Seeds and parts of plants developing therefrom when protected by a method ciaimed in any of claims 1 to 4.