DE1144531B - Control of rodents living underground, mainly voles - Google Patents

Description

To combat the large vole (Arvicola terrestris L.) mechanically operating traps, Poison bait as well as preparations that develop poisonous gases are used. However, these control methods have considerable technical disadvantages. So catching with traps is only possible with careful consideration and knowledge of the habits of the underground animals successfully and assumes a good one Practice ahead. The success of poison baits depends on whether the animals accept the bait. In in many cases it is entered in the pantry without sufficient poison being absorbed, to kill the animals. The animals often protect themselves against the effects of poisonous gases by burrowing the corridors. In addition, in duct systems with a large volume, the necessary poison concentration must be achieved very difficult.

Damage caused by voles occurs primarily in fruit growing and tree nurseries; it is often the cause to total losses. The animals get to the root system of the trees through underground passages. here They gnaw off the bark of the roots at the base of the trunk down to the wooden part, and through this damage the trees usually die within several months, depending on their size. With those of Voles attacked trees put the gnawed root part in a burrow, so that the animals can gnaw around all the main roots near their point of attachment. The damaged fruit trees After all, they only stand loosely in the ground and can be pulled out with ease.

It has now been found, surprisingly, that voles and fruit trees are combated with great success can be protected from vole feeding and damage, if one is in those preferred by the animals Containing agents for the soil in the vicinity of the root neck of the fruit trees Voles that are highly toxic and consist of powdery or granular carriers, on which the toxins are applied and mixed with the bait substances that voles like to accept are.

It is known that field mice and wood mice are treated with chemically very stable agents, e.g. B. Hexachlorhexahydrodimethannaphthalin, Hexachlorepoxyoctahydrodimethannaphthalin, chlorinated camphene with 65% chlorine content, to be destroyed in the poisoning process by superficial application of certain amounts of active ingredient per hectare. Voles can also be controlled in this way in certain areas with a high groundwater level, since the animals here their food to a greater extent on the surface to combat those living underground
Rodents, mainly voles

Applicant:

Chemical works Albert,
Wiesbaden-Biebrich, Albertstr. 10-14

Dr. Ernst August Bartels, Wiesbaden,
has been named as the inventor

than is usually the case. In the usual fruit-growing areas, especially in allotments, this surface poisoning procedure against voles is not effective enough and because of the associated dangers for humans and other warm-blooded animals not to be carried out.

Targeted control of the animals is therefore extremely difficult during the summer months, because during this time they can find enough food underground everywhere. Relocate only at the beginning of winter time the animals their feeding activity in the soil area of the fruit trees and are with the invention Means to hit well here.

The fight against the voles and thus the protection of the root neck area of the trees with the Means according to the invention is expediently carried out around the base of the trunk at a distance of About 10 cm with the help of a planting iron two to four holes of about 2 cm in diameter by about 40 cm Depth and lets the funds trickle into these holes. It arises in this way around the Root neck »protective pillars« of the agent, which the voles protect against the taproot of the Having to push through trees. The pourable granular agent rolls into the voles and voles come into contact with the poison. A twofold effect is achieved here: On the one hand, there is the possibility that the animals contaminate their fur, their paws with the toxin and when Cleaning the fur, pick it up or eat the poisoned attractant that is included as bait. By messing up the remedy in the area around the roots, the roots themselves also become impregnated with the poison, and when eating the root bark, the animals ingest the poison.

309 537/591

As carriers of the agents according to the invention, for. B. granulated superphosphate or granular Complete fertilizer can be used, or the toxins can also be applied to granular pumice, or coarse sand similar substances should be applied. Substances with high acute toxicity for rodents can be used as toxins, z. B. Hexachlorhexahydrodimethannaphthalin, Hexachlorepoxyoctahydrodimethannaphthaun, chlorinated camphene with 65% chlorine content, or else

then with 6 kg hexachlorepoxyoctahydrodimethannaphthalene dust concentrate 50%, 4 kg of finely ground rosin (10% passage through DIN 100), 3 kg carob meal (diameter 2 to 4 mm) with a content of 0.1% p-oxybenzoic acid mixed. After drying, 500 g of talc are added to this mixture, the one Has silicone oil content of 1%. 100 kg of an evenly powdered, easily pourable,

Example 2

91 kg of granular superphosphate are combined with 2 kg Carob meal, which contains 0.1% p-oxybenzoic acid, mixed and then mixed with 2 kg hexachlorepoxyoctahydrodimethane naphthalene, in the appropriate solvents, for. B. xylene is dissolved, be

Poisonous substances are used to prevent the coagulation of the grains of the blood even after it has been introduced into the blood, such as B. Derivatives of the soil retains its flowability. 4-oxycoumarins. The proportion of the first-mentioned chlorinated hydrocarbons is set as a function of the LD ₅₀ , it is up to 10%, preferably 3%, while the content of anticoagulant substances remains in the order of magnitude below 5% because of their greater effectiveness in chronic poisoning can. In order to increase the adhesive effect of the toxic substances on the carrier grain and on the pest, highly adhesive, fine-milled items are used. Then 1 kg of a 5% oxylene resins, e.g. B. rosin, in an amount of powder containing coumarin, 2 kg of finely ground 10%, preferably 2%, added. Rosin and 2 kg of talc with a mineral

To achieve an additional attraction, use an oil content of 5% with the pretreated Superdie the animals may be mixed directly into the phosphate-carob mixture. Man scared Lots are led, whereby the active 25 holds 100 kg of a permanently free-flowing vole and safety of the agent is increased, control agent. can the granular material with attractants, such as. B. with carob, the grain size of the attractant being either that of the grained Means corresponds to or is so far away that it envelops the means 30 in powder-like form in femoral form. Both Components, the granular carrier and the attractant are impregnated with the rodenticidal substances. The content of attractants can be of the order of magnitude of up to 10%, preferably 3%. 35 100 kg of a granular, free-flowing one is obtained

All of these percentages relate to the preparation on the fully formulated product.

In order to maintain the free-flowing properties of the agents according to the invention in the soil, they are added small amounts of hydrophobic substances, e.g. B. silicone oil, Machine oil or the like. This prevents wetting of the grains and retains the agent its free-flowing properties even after a long period of storage in the ground, which results in the desired killing effect is increased.

In order to keep the attached bait substances in the soil from decomposing, they are bacteriostatic and / or added fungistatic substances, e.g. B. benzoic acid, thymol or the like.

Example 3

93.5 kg of complete granular fertilizer are combined with 2 kg of a powder containing 5% oxycoumarin, 2 kg Carob flour with a thymol content of 0.1%>, 2 kg of finely ground rosin and 500 g Talc mixed with a silicone content of 1%.

example 1

85.5 kg of granular superphosphate are wetted with 4 l of a 25% cell pitch powder solution and

Claims (1)

PATENT CLAIM: Control of rodents living underground, in particular voles, characterized in that spreading agents known per se for combating rodents, which contain toxins, bait substances and water repellants, are introduced into the ground in powdery or granular free-flowing form around the trunks to be protected. Documents considered: German Patent No. 880 524; French patent specification No. 1063 279; -Frickhinger, "Guide to Pest Control", 1955, p. 412, paragraph B.