DE671162C - Caterpillar repellants - Google Patents

Description

Caterpillars In our time we have insecticides that contain Rotenone (made from the roots of the plant genus Derris Lonchocarpus and others) one received increasing attention; however, stands the high price of the drugs in question the introduction of the very effective preparations in large farms hindering against. In addition, they are not sufficiently effective against caterpillars are.

The surprising observation has now been made that the effectiveness these substances against caterpillars through combination with veratrin-containing drugs or can significantly increase the extracts and alkaloids obtained from it, while at the same time a higher economic efficiency of the control agent is achieved. The achieved thereby The increase in effectiveness goes far beyond the sum of the effects of the individual components and equals a potentiation of the individual effects.

There are already preparations made from sabadill seeds as a means against Vermin has been recommended (H a g e r s Handbook of Pharmaceutical Practice, a. Vol., 1903, p.763), but its application is limited, as can be seen from the enclosed Comments and recipes are clearly stated exclusively on the control of ectoparasites (head lice, etc.).

Likewise, the combination of Derrisolkupferkallcbrühe recommended by Hartze 11 (I. Econ. Ent. Vol. -3, pp. 19o to 197) , which apart from only weak insecticidal activity increase also has the disadvantage of not being durable, is only against Psylla pericola, by no means but can be used against caterpillars.

Insecticidal mixtures have also already been proposed which from mixtures of nicotine and derris extract or powdered components of plants of the genus Derris should exist. Such mixtures are said to be used as dusts Can also be used to control caterpillars, but their combined effect is only of a short duration, as the nicotine is too volatile to stay in that for a long time to be able to hold dusty powder. In addition, such nicotine-containing dusts show strong irritant effects on the mucous membranes.

To prove the alleged advantages of the claimed control agent, the following series of tests, which were carried out with dusts produced by intensive grinding of talc, e.g. B. with Semen Sabadillae and Radix Derridis ellipticae or similar drugs of the Derris group or with the extracts concerned. As can be seen from the examples, it is irrelevant for the effectiveness of the combination of drugs whether a lesser or greater amount of drugs containing veratrine is present than the drugs containing redone; the mixtures are effective in all proportions. 1. Series of experiments on Tephroclystia absinthieta 01. (Geom @ etridae). The tests were carried out on a backing of blotting paper in such a way that the atomized powders after sedimentation each resulted in a uniform coating of 0.16 mg per cubic centimeter. Preparation dead survivors Caterpillars caterpillars Talc + 2.5 '/ " Derris root....................................... I 29 ° I0 20 - + 5 ° / - ................................... - + 7.5, /. * -. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 12 - + 7.5 "/, Sabadill seeds .................................. 17 13 - + 1o ° / ° - ............................. a .. ig II _ -; - I5 ° / ° - .................................. 26 - + 2.5 '/ (, Derris root + 7.5 "/, Sabadill seeds.............. 30 0 - + 7.5 ° / ° Sabadill seeds + 0.5 ° / ° Derris eliptica extract ..... 30 0 - + 1.5 '/, Sabadill seed extract + 0.5 ° / ° Derris malacensis- Extract .............................................. 15 0 Control ............... .................................. ..... 0 30 II. Series of experiments on white tailed caterpillars, 5th stage.

These experiments were carried out as in I, but on a base of cabbage leaves. Preparation '+ # after Dead 24 hours # Hours 72- hours live Talc + 3.5 ° / ° Radix veratri chloroform- extract ........................ 2g I - +0.50 I ° Derris malacensis extract 5 ° / ° Sabadill seeds -} - io ° / ° Cube-. root powder. . . . . . . . . . . . . . . . . . . 35 0 - + 15 "/, Sabadill seeds............. After immediately i incipient Cramps all animals 17th - + 15 '/, cube root powder. . . . . . . . . . . every 35 animals 7 caterpillars 7 caterpillars 7 immediately paralyzed, recovered without eating 4 animals fall ztt eat after 3 hours from III. Experimental series on caterpillars of Malacosoma neustria, IV stage.

These experiments were carried out on 20 caterpillars, the agent consisting of talc -j-- 7.51 /, derris root and 2.50 / 0 sabadill seeds, in a dosage of 0.25 mg / qcm (= 251 <: g / ha) was applied. After 6 days, 1 i caterpillars were dead, the rest paralyzed and moribund; 6 of these were lying on the ground, the remaining 3 were found hanging on the apple shoots on which the caterpillars ate before the experiment. Fresh food could no longer be observed. After 10 days all the caterpillars were dead. Instead of the drugs, you can also use their effective extracts or the effective substances obtained from them. Such a means consists e.g. B. from a mixture of o, 2 % Rotenone, 0.3% o veratrine and 99.5% o kaolin; its effectiveness corresponds approximately to that of the mixtures of the corresponding drugs given above.

Claims (1)

PATRNT CLAIMS :: i. Caterpillars, characterized by a content of mixtures of drugs containing redone and veratrine. z. Means after Claim i, characterized in that the drugs obtained therefrom are used instead of the drugs Contains extracts or their active ingredients.