DE975426C - Destruction of eggs by mites and spider mites - Google Patents

Description

Issued on the basis of the First Transition Act of July 8, 1949

(WiGBl. P. 175)

FEDERAL REPUBLIC OF GERMANY

ISSUED NOVEMBER 23, 1961

GERMAN PATENT OFFICE

PATENT LETTERING

CLASS 451 GROUP 9i4 INTERNAT. CLASS A 01 η

D 6544 IVa 1451

Richard W. Hummer and Eugene E. Kenaga, Midland, Mich. (V. St. A.)

have been named as inventors

The Dow Chemical Company, Midland, Mich. (V. St. A.) Destruction of the eggs of mites and spider mites

Patented in the territory of the Federal Republic of Germany from October 1, 1950

Patent application known since February 4, 1954

Patent issued November 2, 1961

The priority of registration in the V. St. v. America February 2, 1949

is used

The invention relates to the use of an aqueous dispersion of ^ chlorophenyl ^ chlorobenzenesulfonate in an amount of 35 to 500 g per cbm of the dispersion to destroy the eggs of mites and Spider mites.

The European red mite (Paratetranychus pilosus), the spotted spider mite (Tetranychus bimaculatus) and related mites are known to infest Trees, especially fruit trees (apple, sweet and

Sour cherry, pear, peach, plum, quince, citrus, etc.), shrubs and other plants, also here especially fruit-bearing (raspberry, strawberry, currant, etc.), and straighten large Damage on.

Among the large number of mite control agents proposed so far has become as a result of many types of plant inhabitants and their different levels of resistance to the

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individual remedies as well as the problems with the toxic coating that is left as residue on the plants should remain, are linked, no means have yet been found that meets the requirements. A S An agent that damages the multiplying mites and kills adult mites quickly be totally inadequate because its permanent activity is low and it cannot kill mite eggs. The problem of mite damage in fruit trees ίο is growing even more recently Use of so-called contact insecticides makes it difficult, although they are effective against most common orchard insects are effective, but specifically do not destroy mites. Dichlorodiphenyltrichloroethane and closely related toxic agents appear to be beneficial organisms that exterminate and thereby mites usually keep the mite infestation within reasonable limits.

It is now known that 4-chlorophenyl-4-chlorobenzenesulfonate has high toxicity to insects (cf. "Helvetica Chimica Acta", 1944, pp. 892 to 902). One could have assumed that already one a low concentration of the compound is sufficient to exert a killing effect on mites. try but showed that 4-chlorophenyl-4-chlorobenzenesulfonate was inactive at a maximum concentration of 1% compared to adult mites (cf. "Journal of Economic Entomology", 1948, Vol. 41, No. 6, p. 875 to 882). On the basis of this fact one should have assumed that 4-chlorophenyl-4-chlorobenzenesulfonate cannot play a special role in mite control.

Surprisingly, it has now been found that this is not particularly toxic in adult mites 4-chlorophenyl-4-chlorobenzenesulfonate in a concentration of 35 to 500 g per cbm of aqueous Dispersion is effective, almost specifically effective in mite and spider mite eggs. The agent according to the invention is also selectively effective against many other insects.

By spraying or dusting the claimed dispersion of 4-chlorophenyl-4-chlorobenzenesulfonate on the surfaces of the plants to be treated there will be a permanent residue of the toxic Material down. The agent can be used before the plants or trees are attacked, or you can also handle plant surfaces that are already infested with mites and spider mites. In any case, it is essential that there is complete coverage of all plant surfaces achieved.

With regard to the resistance of the toxic residues, the agent is to be regarded as unique because it is a egg-killing effect and the resulting reduction the mite infestation was found after 60 and 90 days. Such a long one Remaining effectiveness does not characterize commercially available substances harmful to the body.

Another advantage of the agent is the non-plant-damaging nature of the residues that are left on deposited on the plant surfaces. Applications of the dispersion according to the invention as a spray under strongly differing climatic conditions have shown that any Trace of leaf or fruit burning or browning or other undesirable reactions of the Plants did not enter.

The 4-chlorophenyl-4-chlorobenzenesulfonate as an active toxic agent is used according to the invention together with a wetting or dispersing agent or an aqueous emulsion or suitable mixtures of these substances used. The toxic sulfonate can be present in such mixtures in relatively high concentrations be and form a concentrate that is suitable for further dilution, or even in very much are available in a diluted form and can be used as drizzle without further modification. at Concentrates, 4-chlorophenyl-4-chlorobenzenesulfonate is usually used in amounts of 5 to 95% of the Mixture applied.

Suitable wetting and dispersing agents are alkali and alkaline earth caseinates, blood albumin, and alkali salts, more aliphatic Long chain sulfates, partially neutralized sulfuric acid derivatives of petroleum and of course Occurring glycerides, sulfonated derivatives of phenols and aromatic acids and their salts, Soaps, condensation products of alkyloxides with organic acids, alkanolamines and complexes Ethereal alcohols and esters, aqueous emulsions of petroleum distillates, fatty oils and the like.

Examples

i. Very finely divided 4-chlorophenyl-4-chlorobenzenesulfonate, Sodium lauryl sulfate and water were mixed and ground in a ball mill for egg killing Spray mixes in the form of aqueous dispersions of 4-chlorophenyl-4-chlorobenzenesulfonate which contain 250 g of sodium lauryl sulphate per 1 cbm. Cranberry bean plants in pots, infested with spotted spider mites and their eggs were immersed in this mixture, to determine the degree of toxicity of the latter to mite infestation. The following Results were observed 6 days after treatment.

Toxic Killed
Spider mite Percentage of middle
in grams eggs in ° / ₀ adult
killed to 1 cbm each 100 Spider mites 475 100 33 240 100 18th .125 100 12th 62 97 0 31 0

There was no damage to the foliage of the treated plants or disfiguring effects watched them.

2. Experiments were carried out with the mixtures according to Example ι to the remaining effect of the detect toxic agent deposited on the surfaces of the bean leaves. Here were blackberry bean plants in an aqueous dispersion of 125 g of 4-chlorophenyl-4-chloro

benzenesulfonate dipped on ι cbm and dried on it.

One hour after immersion and drying, previously unaffected leaf surfaces were infected with adult mites, which immediately laid eggs on the leaf surface. 6 days after infection were 97 killed ° / ₀ of eggs. 3 days after immersion and drying, another group of bean plants was infected with spider mites. 7 days post this infection were 96 ° / ₀ of eggs which were placed on the leaf surfaces killed.

3. 40 parts by weight of 4-chlorophenyl 4-chlorobenzenesulfonate, 51.5 parts of attapulgite clay, 7.5 parts of bentonite, 0.5 parts of a sulphite liquor with wetting and dispersing properties and 0.5 parts of polypropylene glycol (Molecular weight 1200) are used to produce a powder concentrate with wetting agents Properties marry together.

The above concentrate was dispersed in 500 g to ι cbm in water for the purpose of combating Bryobia praetiosa and the European red mite in an orchard of Bartlett pear trees. the The adult trees were sprayed with conventional spray equipment, namely in one Lot of approximately 411 on the tree under careful Attention to distribution and coverage applied. The blossoms were still on the trees but were already falling off and the leaves were just coming out. Lots of mite eggs were on the old one Wood, but with only a few mites that were in the protonymph stage. As a result of the heavy The entire orchard, including the test trees, was infected with mites by an airplane Hexaäthyltetraphosphatstaub a few days after the application of the 4-chlorophenyl-4-chlorobenzenesulfonate pollinated.

121 days after the end of spraying with the mixture containing the poisonous sulfonate became various pieces of tree-covered land examined and made random observations to determine the degree of mite infestation. The following results were found:

weight

the mix

on 1 cbm

spray

in grams

Comparison trees

Adult
dead Bryobia
on the paper

3 to 10
10 to 25

Viable

Red

Mite eggs
on the paper

I to 3
10 to 25

Adult
living red

Mites
on the paper

less than 0.5

ι to 3

The presence or absence of dead adult Bryobia praetiosa at the time of counting gives a measure of the egg killing effect of the initial treatment since the adult Specimens that are on the leaves and that were killed by the hexaethyltetraphosphate dust were those that had hatched from eggs by the original application of the toxic sulfonate had not been killed. Trees that were badly infested with mites bordered attached to the treated orchard and formed a source of re-infestation throughout Growing season. Significant differences were found in the colors of the leaves and in general Appearance of the treated and the test pieces observed, the treated trees in a lot were in better shape than those not splashed with the 4-chlorophenyl-4-chlorobenzenesulfonate mixture was. There was no damage from the use of the egg-killing spray.

Claims (1)

Claim: Considered publications:
Helvetica Chimica Acta, 1944, p. 892;
Journal of Economic Entomology, 41 (1948), pp. 875-882. Use of an aqueous dispersion of 4-chlorophenyl-4-chlorobenzenesulfonate in an amount from 35 to 500 g per cbm of the dispersion to destroy the eggs of mites and spider mites. © 109 732/28 11.61