DK144141B - FROEMATERIAL TREATED WITH INSECTICID - Google Patents

Description

(19) DENMARK (w) f \ Ra /

02) PROCEDURE WRITING nn 1441 41 B

DIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Application No. 8ll / 76 (51) Int.CI.3 A 01 N 47/22 (22) Filing Date Feb 26 1976 (24) Running day Feb 26 1976 (41) Aim. available Aug. 28 1976 (44) Presented 21 Dec. 1981 (86) International Application No. - (86) International Filing Day - (85) Continuation Day - (62) Master Application No. - (30) Priority Feb 27 1975 * 8267/75 * GB (71) Applicant FISONS LIMITED, London, GB.

(72) Inventor Peter John Brooker, GB: Quinton Ashton Geering, GB.

(74) Clerk of the International Patent Office.

(54) Seed material treated with in = * secticide.

The invention relates to insecticide-treated seed material which is characterized in that it contains from 0.1 g to 28 g, preferably not more than 18 g, and more preferably from 0.25 g to 10 g, 2,2-dimethyl-1. 3-benzodioxol-4-yl-N-methylcarbamate per kg of seeds.

By the term "treated" is meant herein that the seeds are either in intimate admixture with the 2,2-dimethyl-1,3-benzodioxol-4-yl-N-m methylcarbamate or are coated therewith. Preferably, the seeds are treated with the carbamate either by drying with a dry agent or by a conventional spray coating technique in which the carbamate is dissolved or dispersed in a volatile solvent which is sprayed onto the seeds and evaporated. from this, or by a conventional pelletizing process in which the carbamate is mixed with a solid support, e.g. clay or wood flour, and the seeds are coated with this mixture. Of course, the technique chosen will depend to some extent on the seeds to be processed. Treatable seeds include e.g. vegetables, in particular cabbage, onions and beans (eg soybeans), cereals, especially wheat, barley, oats and corn, and root crops, especially beet. The treatment applied to each type of seed will usually depend on the conventional treatment for that type of seed. Thus, sugar beet seeds, which are often pelleted, will usually be processed by a pelleting. However, cereals which are not usually pelleted will preferably be treated, by powdering or spraying.

The treated seeds according to the invention exhibit a surprisingly high germination ability and ability to further develop the germs in the presence of insect pests, and it has further been found that the carbamate can be surprisingly absorbed systemically by the small plants to achieve resistance to insect infestation after the plants have emerged. of the earth.

2,2-Dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate is a known compound which has been used as an insecticide under the name Bendiocarb to control e.g. cockroaches.

In contrast, the compound has not previously been proposed for the treatment of seeds, and it has been surprising to those skilled in the art that it has proved suitable for this purpose.

In order for an insecticide to be suitable for the treatment of seed material, it must meet certain essential requirements which are extremely difficult to satisfy. Since the seeds are placed in the soil, it is of course necessary that the insecticide is stable in the soil and remains here long enough to prevent damage caused by insect infestation during the earliest stages of plant development. Of course, the compound must also be practically non-phytotoxic.

Soil constitutes a particularly unfavorable environment for pesticides. Among the factors that help to break down any pesticide are the constant presence of aqueous phase, the effects of sunlight, the effects of soil microorganisms and temperature fluctuations. The conditions are so difficult that the only widely available insecticides for use in the soil have been those which fall within the group known as the organic chlorine-containing insecticides which are distinguished by their extreme stability and resilience. All other types of insecticides have so far been found to be insufficiently stable and / or to be phytotoxic.

Because of their chemical structure, carbamates are highly susceptible to hydrolysis, and numerous works exist which indicate this as the reason that such materials are usually not usable in the soil.

However, as mentioned, 2,4-dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate has been found to be surprisingly useful in treating seeds to provide adequate protection in the soil for a sufficiently long period of time. This is a great advantage, especially since it allows for the use of a material other than the organic chlorine-containing insecticides, which insecticides are very toxic to mammals and birds, as is well known. A typical example of such a chlorine-containing insecticide is 1,4,5,6,7,8,8-heptachlor-3a, 4,7,7a-tetrahydro-4,7-methanoindene, known by the name of heptachlor.

It is evident from the following test results that ben-diocarb provides greater protection against insect infestation than heptachlor at the same or lower dosage level. In the experiments in question, a comparison is also made with a commercially available carbamate insecticide, namely 2,3-dihydro-2,2-dimethylbenzo-furan-7-yl-methylcarbamate, known by the name of carbofuran.

In the experiments, beet pellets were pelleted with the insecticide in question in the amount indicated, and the seeds were sown at eight different sites in Germany to determine the number of plants that sprouted, which number depends on the extent of insect infestation on the seeds. The table below lists the number of plants obtained per year. meters of wounds.

4 144141

Compound Control Heptachlor Carbofuran Bendiocarb gram active substance per 0 6.0 30.0 45.0 90.0 L50.0 3.0 6.0 12.0 __ 100,000 seeds __________ 1 0.44 2.76 7.88 8.29 8.18 8.03 5.34 7.19 7.36 2 3.27 4.87 5.33 5.92 6.14 5.62 5.37 5.85 5.84 3 7.08 7.41. 7.07 7.17 6.68 6.36 6.88 7.33 7.19 tho 4 2.78 6.45 6.87 7.43 6.83 5.68 7.01 6.37 7, 13 o '5 0.46 2.07 5,496.24 6.13 6.20 4,135.63 5.87 3 6 6.72 6.98 6.75 7.15 7.04 6.68 6.71 7, 02 7.31 I 7 1.49 2.87 3.57 2.52 3.73 3.30 2.39 2.38 3.13 a 8 6.94 7.20 7.08 7.44 6.95 6.91 7.02 7.10 7.17

Average 3.65 5.08 6.26 6.52 6.46 6.10 5.60 6.11 6.41% of control 100 139 172 179 177 167 153 167 176

In addition to bendiocarb's superiority to heptachlor, the table shows that bendiocarb yields similar results to carbofuran, but at a dosage of approximately one quarter of that required with carbofuran. This is very surprising, since these two carbamate insecticides exhibit practically the same insecticidal activity across a wide range of insects in applications other than the soil.

Bendiocarb's superiority in the soil must therefore be due to a completely unpredictable special stability of this compound.

Insects against which the treated treated seeds are protected include beetles and forcible insects, e.g. larvae (Agriotes Spp), pygmy beetle (Atomaria), collembola and millipedes, symphilids and earth fleas (Chaetocnema Spp).

The seed material of the invention is preferably sown so that one carbamate concentration per hectares ranging from 0.2 to 400 g in an area that is either infected with or susceptible to infection by the insects concerned. The concentration of carbamate per per hectare, of course, depends to a large extent on the amount of seeds sown, and this depends on the crop concerned. Thus, e.g. a preferred concentration of carbamate when the seeds in question are beet seeds, from 1-15 g per per hectare, in the case of a cereal crop such as wheat, an amount of 200 g / hectare or more is preferred.

144141 5

In addition to the carbamate, the treated seed material of the invention may contain other active insecticides or fungicides. Particularly suitable are mixtures with fungicides, e.g. thiram, benquinox, captan or S-ethyl-N- (3-dimethylaminopropyl) thiocarbamate or salts thereof, e.g. hydrochloride.

A further insecticide may also be applied to the soil, usually in the form of a granulate, at the time of sowing the seed material of the invention. Examples of such insecticides are aldicarb, carbofuran, phorate, disulfoton, dimethoate, chloromephos, phonophos, diazinone, hexachlorocyclohexane, St-butylthiomethyl-0,0-diethyldithiophosphate and 3,3-dimethyl-1-methylthio-2-butanone. -O- (methylcarbamoyl) oxime. 2,2-Dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate may also be added to the soil.

The invention is further illustrated by the following examples.

Example 1

Beetroot seeds were processed by pelletizing after the Maribo process (Zucker, _2j5 (10), 533-540 (1973)). 2,2-Dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate was incorporated into the pelleting agent to give a final concentration of 10 g / kg of untreated seed.

Example 2 Cabbage seeds were treated as follows: 2 kg Cabbage seeds were placed in a metal drum and 20 g of a treating agent of the following composition was added: 2,2-dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate 2 , 5 wt. Attapulgitler 15 "" Risellan oil 17 4 "Berkbond" No. 1 (silicate-based filler) 78.5 "

The closed drum was rotated on horizontal rollers for 30 minutes to obtain an even treatment of the seed material.

Example 3

Wheat was treated as follows: 6 14/4141 10 kg Wheat was placed in a metal drum and 50 g of a treating agent of the following composition was added: 2,2-dimethyl-1,3-benzodioxol-4-yl-N- methyl carbamate 10% by weight Attapulgitler 15 "" Ri $ ellan oil 17 4 "Berkbond" No. 1 71

The closed drum was rotated on horizontal rollers for 30 minutes to obtain an even treatment of the seed material.

Example 4

Five areas were sown with equal amounts (corresponding to about 3 kg of pelleted seed material per hectare) of beet seed pelleted o At each area, separate areas were sown with control pellets not containing 2,2-dimethyl-1,3-benzodioxol-4-yl. -N-methylcarbamate and with pellets containing the carbamate. The carbamate-containing pellets yielded carbamate concentrations of 3.0, 6.0 and 12.0 g / ha at sowing.

The table below shows the average number of emergent sprouts per day. meter sown row:

Table 1

Area Control 3.0 g / ha 6.0 g / ha 12.0 g / ha (0 g / ha active active active active active ingredient) stand stand stand stand 1 0.44 5.34 7.19 7.36 2 3.27 5.37 5.85 5.84 .3 2.78 7.01 6.37 7.13 4 0.46 4.13 5.63 5.87 5 1.49 2, 39 2.38 3.13

Example 5

Areas in a single range were sown with equal amounts of sugar beet seeds mixed thoroughly with 2,2-dimethyl-1,3-benzodioxol-4-yl-N-methylcarbamate (8 g / kg seed), the γ isomer of 1, respectively. 2,3,4,5,6-hexachlorocyclohexane (10 g / kg seeds), and diethyl 3,5,5-trichloropyridyl phosphorothioate (10 g / kg seeds).

The number of plants per year. hectares for these three areas were 67,900, 46,500 and 39,600 respectively.