EP2148566A1

EP2148566A1 - Snail bait

Info

Publication number: EP2148566A1
Application number: EP08758427A
Authority: EP
Inventors: Wolfgang Wirth; Michael Kilian
Original assignee: Bayer CropScience AG
Current assignee: Bayer CropScience AG
Priority date: 2007-05-16
Filing date: 2008-05-09
Publication date: 2010-02-03
Also published as: EP1992226A1; WO2008138552A1; JP2010526843A; AU2008250615A1; CA2687397A1; US20100129338A1; EP2245928A2

Abstract

The present invention relates to the use of a combination of a potato preparation and yeast to improve the attractiveness of molluscicides. It also relates to corresponding compositions, methods for producing said compositions, and the use thereof to control terrestrial snails.

Description

snail bait

The present invention relates to the improvement of the action of snail baits, to corresponding snail baits, to processes for their production and to their use for controlling snails.

It is already known to combat terrestrial snails with the aid of baits containing feedstuffs and molluscicidal active substances such as methiocarb, metaldehyde or metal chelates (see DE 35 03 608A, DE 36 12 161A, WO 96-05 728A, WO 97-26 789A, WO 99-25 194A, WO 99-39576A and WO 00-11 948A). The effectiveness of these preparations is not always satisfactory.

It is also known that snail baits, whether they contain feeding or contact agents,

Contain components that release volatile compounds so that the snails from the crop such. Vegetables or salad are distracted and lured to the bait. In addition, the other formulation components of the feedingstuffs must be such that the snails eat the largest possible amount of the bait so that they receive a lethal dose of the corresponding active ingredient.

Typically, most snail baits are formulated based on cereal flocs that have the property of being extruded dry or wet. Depending on the method, more or less bran or coating components may also be added to the flour. As cereal flours are e.g. Common wheat or durum wheat flour in question (EP 1 107 666).

Also potatoes or mashed potatoes have already been described as part of bait formulations. Thus, JP S63-162608 discloses baits containing wheat flour and mashed potatoes. JP H09-110603 discloses mixtures of mashed potatoes and rice bran as bait component. EP 0 400 863 describes impregnated potato chips. Lange & MacLeod (Journal of Economic Entomology, 1941, 34, 321-322) describe boiled potatoes as part of snail baits. None of these publications discloses the use of

Yeast in combination with mashed potatoes to provide particularly attractive snail baits.

Many heavy metals such as aluminum, copper, manganese, zinc, nickel and iron are known to have a molluscicidal action (GB 2207866). However, these heavy metals in particular have the disadvantage of the bad taste for the snails, so that they have in the form of their inorganic salts an insufficient molluscicidal activity. In the subsequent period, however, it has been found that the taste of the metal ions is improved by conversion into organic complex compounds (US Pat. No. 5,437,870, WO 96/05728, EP 0 725 562, WO 04/075634). The snails thus eat more of the metals formulated as organic complexes, which in turn results in reaching the toxic dose.

It has now surprisingly been found that compositions containing a potato preparation and yeast (preferably brewer's yeast) are especially eaten and eaten by snails, thereby increasing the molluscicidal activity.

The subject of the present invention is therefore the use of a combination of potato preparation and yeast to improve the attractiveness of molluscicidal compositions for snails. In particular, the present invention also provides the use of a combination of potato preparation and yeast to increase the attractiveness of molluscicidal compositions for snails.

The present invention furthermore relates to molluscicidal compositions (hereinafter also referred to as snail baits) which contain a potato preparation and yeast, as well as processes for their preparation and their use for controlling snails.

A potato preparation which can be used according to the invention is obtained from potatoes. In one embodiment of the invention, the potato preparation by the comminution and

Dry boiled (peeled or unshelled, preferably peeled) potatoes won. In another embodiment of the invention, the potato preparation is characterized by the

Mincing and drying raw (peeled or unshelled, preferably peeled) potatoes. These methods are known, e.g. from the food industry for making mashed potatoes.

A preferred potato preparation according to the invention is characterized by a water content of less than 10% by weight. Optionally it may contain other additives such as antioxidants or emulsifiers, but only up to a total content of 5% by weight, which additives have no significant effect on the improvement in attractiveness achieved by the potato preparation. They are only for better handling of the

Preparation.

It can be inventively improve all snail baits, regardless of the molluscicidal active ingredient used. The active ingredient may be, for example, methiocarb, metaldehyde, a molluscicidal metal salt or a molluscicidal metal salt chelate.

According to the invention, the combination of potato preparation and yeast is preferably used to improve the attractiveness of snail baits containing as active ingredient at least one iron salt and / or at least one iron salt chelate. As chelating agents are all Suitable classes of substances commonly used, for example phosphonic acids, ethylenediaminetetraacetate (EDTA) and its derivatives, pectins and their derivatives, iminodisuccinate, iminodifumarate, iminoditartrate, iminodimaleate, ethylenediamine difumarate, ethylene-diaminedi-maleate, iminodimaleate, ethylenediamine dinitrate, ethylenediamine dimaleate, ethylenediamine disuccinate etc.

Particularly preferred is the use of the combination of potato preparation and yeast for

Improvement of the attractiveness of snail baits containing

a) at least one phosphonic acid ester of the formula (I)

O

Il (I)

HO-P-R

OH

in which R for stands,

which is mono- or polysubstituted, identically or differently, by PO ₃ H ₂ , CO ₂ H, OH, NH ₂ , CN,

Halogen, C 1 -C 9 -alkylamine or di- (C 1 -C ₈ ) -alkylamine and which is optionally interrupted by 1-6 heteroatoms from the series N, O, S, P, where heteroatoms are not directly linked to one another;

and

Ammonium, alkali metal, alkaline earth metal and / or iron salts;

or

b) at least one ammonium, alkali metal, alkaline earth metal and / or iron salts of the phosphonic acid esters of the formula (I).

Optionally, the worm baits according to the invention contain further components, for example:

- Fine grain cereal flour and / or

- Binders and / or

- other additives.

The worm baits according to the invention can be produced by generally known methods. The snail baits particularly preferred according to the invention can be prepared, for example, by

1. a premix off

Phosphonic acid esters of the formula (I)

O HO-PR ^V '0 ^H

and ammonium, alkali metal, alkaline earth metal and / or iron salts,

or

Ammonium, alkali metal, alkaline earth metal and / or iron salts of the phosphonic acid esters of the formula (I)

• at least one diluent and

• if necessary, produces additives,

2. the premix thus obtained with

Fine-grained cereal flour,

• potato preparation,

• yeast,

Optionally binder and

• optional additives

offset

3. If necessary, stir the resulting mixture with enough water to form a homogeneous dough.

4. the dough is extruded and crushed and

5. the resulting product dries. Finally, it has been found that the new snail baits are very useful for controlling terrestrial snails.

Surprisingly, the baits according to the invention in the control of snails show a significantly better effectiveness than the known baits for the same application.

The worm baits according to the invention are characterized by the constituents listed.

The molluscicidal components contained in the snail baits according to the invention are either

a) one or more ammonium, alkali metal, alkaline earth metal and / or iron salts of the phosphonic acid esters of the formula (I),

or to

b) one or more ammonium, alkali metal, alkaline earth metal and / or iron salts of the phosphonic acid esters of the formula (I) in admixture with one or more magnesium, calcium and / or iron salts

or to

c) phosphonic acid esters of the formula (I) in admixture with one or more magnesium,

Calcium and / or iron salts

or to

d) Methiocarb or um

e) Metaldehyde.

Preference is given to phosphonic acid esters of the formula (Ia)

in which

R ¹ , R ² , R ³ , R ⁴ and R ⁵ are each independently hydrogen, C 1 -C ₄ -alkyl, CO ₂ H, CH ₂ CO ₂ H, PO ₃ H ₂ , OH, halogen, CN, NH ₂ stand and m is the numbers O, 1, 2, 3, 4 or 5.

R ¹ , R ² , R ³ , R ⁴ and R ⁵ are each, independently of one another, each hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, PO ₃ H ₂ , CO ₂ H, CH ₂ CO ₂ H, OH.

m is preferably the numbers O, 1 or 2.

Also preferred are phosphonic acid esters of the formula (Ib)

in which

A is C _ö alkyl, Ci-C ₆ -alkylamino, Ci-C ₆ alkoxy is, where two hetero atoms are not linked directly to one another,

B is H, OH, CH ₂ PO ₃ H _2, CN, halogen, NH _2, C _r C ₈ alkylamine or C ₂ -C ₆ dialkylamine group,

n stands for the numbers 0, 1, 2, 3, 4.

A preferably stands for the following groupings:

wherein the carbon atom shown on the left is bonded to the nitrogen in formula (Ib).

B is preferably H, OH or CH ₂ PO ₃ H ₂ .

n is preferably the numbers O, 1 or 2

These remainder definitions can be used among each other, including between the specified preferred

Areas can be combined as desired. Likewise, individual definitions can be omitted. Preference according to the invention is given to the compounds of the formula (I) which contain a combination of the meanings listed above as being preferred. The general or preferred radical definitions given above apply both to the end products of the formula (I) and correspondingly to the starting materials or intermediates required in each case for the preparation.

Particular preference is given to the compounds of the formula (I-1)

Also particularly preferred is the compounds of formula (1-2)

Also particularly preferred is the compounds of formula (1-3)

H, O, PH, C. ^ CH, PO _? H,

(1-3). CH ₂ PO ₃ H ₂

Also particularly preferred is the compounds of formula (1-4)

Also particularly preferred is the compounds of formula (1-5)

CH ₂ PO ₃ H ₂

H ₂ O ₃ PH ₂ C./ ^^^^^^^^ N.

N ^ ^ CH ₂ PO ₃ H _{2 (i 5)}

CH ₂ PO ₃ H ₂ Also particularly preferred is the compounds of formula (1-6)

Also particularly preferred is the compounds of formula (1-7)

H ₂ O ₃ PH ₂ C ^^^ OH f (1-7) CH ₂ PO ₃ H ₂

Suitable salts of the phosphonic acid esters are preferably their ammonium, lithium, sodium, potassium, magnesium, calcium, iron and iron-iron salts. These salts may be uniform or mixed salts. By uniform salts are meant in this case those salts which contain only one of the cations mentioned. Mixed salts are to be understood as meaning those salts which contain various of the cations mentioned. Also suitable are those salts in which not all H ₂ O ₃ P groups of the phosphonic acid esters are present in salt form.

The phosphonic acid esters of the formula (I) and their salts are known or can be prepared by known methods.

In addition to the phosphonic acid esters of the formula (I) or salts thereof, one or more magnesium, calcium and / or iron salts may also be present in the snail baits according to the invention.

Suitable salts of the metals mentioned are preferably sulfates, carbonates and phosphates. Examples include magnesium sulfate, magnesium carbonate, calcium sulfate,

Calcium carbonate, ferrous sulfate, iron (HI) sulfate, ferrous bisulfate,

Iron (H [) hydrogen sulfate, iron (II) hydrogen phosphate, iron (III) hydrogen phosphate,

Iron (II) bicarbonate, ferrous phosphate, iron (ffl) phosphate, ferrous carbonate and iron (m) carbonate. The salts may be in the form of hydrates or in anhydrous form. Especially preferred are iron (II) phosphate, iron (iπ) phosphate, iron (II) hydrogen phosphate, iron (m) hydrogen phosphate, iron (H) dihydrogen phosphate and iron (III) dihydrogen phosphate,

Commercially available flours, such as wheat flour, rye flour, rice starch, etc., may be present as cereal flours in the worm baits according to the invention. Preferred are durum wheat flour and soft wheat flour. The flour is present in fine-grained form, preferably in

Grain sizes below 250 μ.

As binders, it is possible to include in the baits according to the invention all customary adhesives which can be used to prepare such preparations. Preferably suitable are modified starch, formaldehyde-releasing substances, optionally partially saponified polyvinyl acetate and / or molasses.

In the present case, modified starch is to be understood as meaning commercially available products of this type. Preference is given to cold-swelling maize starch.

As formaldehyde-releasing substances, all conventional products may be included, which are suitable for the release of formaldehyde. Preference is given to urea-formaldehyde condensation products.

Suitable polyvinyl acetates which may optionally be present in partially saponified form are preferably the products known by the trade names Mowilith® (Clariant) and Mowiol® (Clariant).

Molasses in the present case are understood to mean syrupy mother liquors produced in the manufacture of sugar.

Suitable additives which may be present in the baits according to the invention are preferably preservatives, dyes, snail attractants, grinding aids, additives, bitter substances, warm-blooded repellents and anticaking agents, as well as synthetic flavors, water and other molluscicidal active ingredients.

Preservatives are all customary substances suitable for this purpose

Consideration. Preferably mentioned are 2-hydroxybiphenyl, sorbic acid, p-hydroxybenzaldehyde, methyl p-hydroxybenzoate, benzaldehyde, benzoic acid, propyl p-hydroxybenzoate and p-nitrophenol.

Suitable dyes are all customary substances suitable for this purpose. Preferably mentioned are inorganic pigments such as iron oxide, titanium dioxide and Ferrocyan blue, as well as organic dyes such as anthraquinone, azo and metal phthalocyanine dyes.

Suitable screw attractants are all customary substances suitable for this purpose. Examples include plant extracts and their derivatives, as well as products of animal origin.

Suitable grinding aids are all substances suitable for this purpose. Examples which may be mentioned are kaolins, clays, talc, chalk, quartz powder and highly dispersed silicic acid.

Suitable additives are substances which are suitable for adjusting the pH in the bait preparations. Examples include citric acid.

Bitter substances are all substances customary for this purpose. An example is denatonium benzoate.

As warm-blooded repellents, which have a repellent effect on warm-blooded animals, such as dogs or hedgehogs exercise, all substances customary for this purpose come into consideration. Nonylic acid vanillylamide may be mentioned by way of example.

Anticaking agents are all substances which are customary for this purpose and which are suitable for use

Avoid clumping and caking. Examples which may be mentioned moisture-absorbing powders, such as diatomaceous earth, fumed silicas, tricalcium phosphate, calcium silicates, alumina, magnesium oxide, magnesium carbonate, zinc oxide, stearates and fatty amines.

In addition to at least one of the molluscicidal active ingredients listed above, the snail baits according to the invention may contain additional molluscicidal active substances. Suitable additional molluscicidal active substances are all substances suitable for this purpose. Exemplified is thiodicarb.

The content of the individual components can be varied in the snail baits according to the invention within a certain range. That's how the concentrations are

Phosphonic acid esters of the formula (I) and / or their ammonium, alkali metal,

Alkaline earth metal and / or iron salts,

optionally in admixture with one or more magnesium, calcium and / or iron salts, generally between 0.2 and 25% by weight, preferably between 1.0 and 10% by weight. On potato preparation between 10 and 50% by weight, preferably between 20 and 40% by weight,

Yeast between 2 and 15% by weight, preferably between 4 and 10% by weight,

In general between 20 and 80% by weight, preferably between 30 and 60% by weight, of cereal flour,

To binders generally between 0 and 25% by weight, preferably between 5 and 20% by weight,

In general, between 0 and 5.0% by weight of additives, preferably between 2 and 5.0% by weight.

In carrying out the process according to the invention are preferably those

Used components that have already been mentioned in connection with the description of the invention snail bait as preferred ingredients.

Suitable diluents for use may be inert organic solvents and / or water. Preferably, water is used.

The amounts of the individual components are chosen so that the substances are present in the worm baits according to the invention in the weight ratios mentioned above. However, the amount of water or diluent is such that a dough is formed in step (3) of the process. The amount of water used is generally between 25 and 35 wt .-%, preferably between 27 and 34 wt .-%, based on the other constituents. In the worm baits according to the invention, however, the content of water is significantly lower, because the initially moist product is still dried in stage (5) of the production process. There remains virtually only the residual moisture present in the cereal flour.

The temperatures can be varied within a certain range when carrying out the process according to the invention. You work in the implementation

The preparation of the premix (stage 1) generally at temperatures between 0 ^° C. and 30 ^° C., preferably at room temperature,

• mixing the premix with other constituents (step 2) is generally at temperatures between 0 ⁰ C and 30 ° C, preferably at room temperature, • mixing with water (step 3) generally at temperatures between 0 ^° C. and 40 ^° C., preferably between 10 ^° C. and 30 ^° C.,

• the extrusion (step 4) generally at temperatures between 20 ⁰ C and 60 ⁰ C, preferably between 30 ⁰ C and 50 ⁰ C and

• drying (stage 5) generally at temperatures between 20 ⁰ C and 90 ⁰ C, preferably between 30 ⁰ C and 80 ⁰ C.

In carrying out the steps (1) to (3) and (5) of the process according to the invention is generally carried out under atmospheric pressure. But it is also possible to carry out the drying process in the step (5) under reduced pressure. In carrying out the step (4) is generally carried out under elevated pressure, preferably under a pressure between 30 and 100 bar.

When carrying out the method according to the invention, all devices customary for such processes can be used. Thus, for the mixing processes in stages (1) to (3), customary mixers are suitable, into which additional substances, such as cereal flour, binders, diluents or water, can be added during the mixing process.

Preferably usable are plowshare mixers, paddle mixers and twin-shaft extruders.

For extrusion in step (4) are common equipment in the food industry into consideration, with the aid of a dough by perforated discs extruded and then crushed can be.

For drying the moist product in step (5), conventional apparatus suitable for removing moisture from particulate solid substances are suitable. In a preferred embodiment, the process is carried out by first drying the moist product in a fluidized bed and then drying it in a separate apparatus to the desired final moisture content.

In particular, when carrying out the process according to the invention, the procedure is that

In step (1), a solution or suspension ("premix") of phosphonic acid ester or salts thereof,

optionally in admixture with other of said metal salts,

and diluents, preferably water and optionally one or more other molluscicidal active ingredients and optionally additives, such as preservatives, dyes, additives, etc. produces,

In stage (2), the premix obtained is mixed with fine-grained cereal flour, with potato preparation, with yeast, optionally with binder and optionally with further additives, to give a homogeneous product,

In step (3) adding so much water with mixing and kneading that a dough is formed,

In step (4) extruding and crushing the dough under pressure and

in the step (5), the particulate material first before and then after-drying and then cooled to room temperature.

In an alternative embodiment, powdery premixes (eg consisting of cereal flour, potato preparation, metal salt or metal salts, yeast) can also be provided in stage (1), which in stage 2 is made into a dough with the phosphonic acid solution and the adhesive solution become.

In an alternative embodiment, step (3) may be omitted, especially if the dough already has the desired consistency.

In an alternative Ausruhrungsform the transition from pre-drying and post-drying takes place continuously.

The size of the snail bait can be varied in carrying out the method according to the invention in the particular desired manner within a certain range. Generally, the dough is ground to produce pellets or strand-like particles. The average diameter or the average length of the particles is generally between 1 and 4 mm, preferably between 1.5 and 3 mm.

The snail baits according to the invention are very well suited for controlling terrestrial snails in agriculture and horticulture. The snails include all land-living nude and housing snails, which occur in the majority as polyphagous pests of agricultural and horticultural crops. Important such pests are nudibranchs, such as Arion rufus (Great Slug), Arion ater and other Arionidae, Limax species, as well as land snails, such as Deroceras reticulatum and agreste from the family Limacidae, as well as species from the family Milacidae, and also harmful snails, such as those of the genus Cepaea, Discus, Helicigona and Helicella. In the control of snails, the application rate of the baits according to the invention can be varied within a relatively wide range. In general, between 2 and 15 kg of snail baits are used per hectare, preferably between 3 and 7 kg per hectare.

The worm baits according to the invention can be applied by conventional methods, such as, for example, by scattering and grooving.

The invention is illustrated by the following examples.

Herstellunesbeispiele

Example 1: Production of inventive worm bait

In a ploughshare mixer, the powdery ingredients are premixed. For this purpose, 42 kg of durum wheat flour with a particle size of less than 250 μm, 8 kg of yeast, 35 kg of potato preparation and 2 kg of iron-IU-phosphate are homogenized for 5 minutes. The solid mixture is then in a

Dough kneader transferred. 3 kg of an approximately 60% phosphonic acid of the formula (I) (HEDP, commercial product from ZSM, pH 1) are diluted with 700 g of water and then slowly added with stirring and at room temperature into the dough mixer. After complete addition, mixing is continued for a further 10 minutes.

17 kg of a ca 60% Polyvinyacetat dispersion (Mowilith®) are diluted with about 700 g of water and then also added with stirring in the dough mixer. Here too, the mixture is stirred and kneaded as above after complete addition for 10 minutes. The resulting homogeneous dough is extruded at 40 ⁰ C under a pressure of 60 bar through a perforated disc with holes of 3 mm in the form of strands, which are crushed by means of rotating knives in 2 to 3 mm long, cylindrical pieces. The resulting material is in one

Driven fluidized bed for 30 minutes by a stream of air whose temperature is continuously increased from 20 ⁰ C and at the end of the drying process, the exhaust air reaches a temperature of 55 ⁰ C. Thereafter, the product is allowed to cool to room temperature and kept open in the air for 3 days so that the equilibrium moisture content in the pellets is established. This gives about 100 kg of worm baits in the form of cylindrical pellets.

Biological Example 1

Effect of the worm baits on snails in the field

Test slugs: Arion species

Test culture: Tagetes patula

Test Method:

Field trial; Agricultural Center Monheim, Monheim South, Germany,

Scattering the bait formulations with 5 g of formulation per m ² on 1 square meter plots with 4 repetitions. Plots were surrounded by snails fences to prevent the very mobile snails leave the plots and migrate to neighboring parcels.

The plots were planted with 4 days of plants. Each parcel was 17 Arion

Snails occupied.

The evaluation was carried out 3, 7 and 14 days after the application by determining the feeding damage (% plants with feeding damage) on the test plants, in addition, was also evaluated for any symptoms of Phytotoxis.

The efficiency of the test substance is 100% (according to Abbott), if no feeding damage has been determined or it is 0%, if the feeding damage is just as strong as in the control.

It can be seen that the compositions according to the invention (variant 2) show an effect which is comparable to products containing molasses, a known screw attractant (variant 3).

The effect is also comparable to a successful commercially available product (variant 4). Table 1

DAT = Days after treatment = days after application of the molluscicidal composition

The baits were prepared by the method described above. The difference to 100% results, for example, from water and binder, which have no influence on the attractiveness and are present in almost identical amounts in all compositions. Biological Example 2

Effect of the worm baits on snails in the field

Test slugs: Arion species

Test culture: Tagetes patula

Test Method:

Field trial; Agricultural Center Monheim, Monheim South, Germany,

Scattering the bait formulations with 5 g of formulation per m ² on 1 square meter plots with 4 repetitions. Due to the very strong feeding activity and the size of the snails, a post-treatment was carried out after 2 days in all plots. The plots were fenced with snails to prevent the very mobile snails from leaving the plots and in

Hiking neighboring parcels.

The plots were planted with 20 days of plants each. Each lot was occupied by 20 Arion snails.

The evaluation was carried out 3, 7 and 14 days after the first application by determining the feeding damage (% plants with feeding damage) on the test plants. In addition, it was also evaluated for any phytotoxic symptoms.

It can be seen that the compositions according to the invention (variant 2) show an effect which is better than that of products containing molasses, a known screw attractant (variant 3).

The effect is also better than with a successful commercially available product (variant 4).

In particular, the effect occurs faster. Table 2

The baits were prepared by the method described above. The difference to 100% results, for example, from water and binder, which have no influence on the attractiveness and are present in almost identical amounts in all compositions. Biological Example 3

Effect of erfindungsseemäßen snails bait on snails in the field

Test snails: Deroceras reticulatum

Test culture: cabbage (variety Greyhound) 6-8 leaf stage

Test Method:

Semi-field experiment; Potcanna Allotment site, Cardiff, United Kingdom,

Scattering the bait formulations with 5 g of formulation per m ² on 1 square meter plots with 5 repetitions. The parcels consisted of ² large plastic crates with walls that could not be crossed by snails. Thus, the very mobile snails could not leave the plots and migrate to neighboring parcels. The bottom of the boxes was 10 cm high with

Potting soil filled.

The parcels were planted with 9 cabbage plants and were each populated with 20 Deroceras snails.

The evaluation was carried out 3, 7 and 14 days after the first application by determining the feeding damage (% plants with feeding damage) on the test plants. In addition, it was also evaluated for any symptoms of phytotoxes.

The effect is also better than with a successful commercially available product (variant 4). Table 3

The baits were prepared by the method described above. The difference to 100% results, for example, from water and binder, which have no influence on the attractiveness and are present in almost identical amounts in all compositions. Biological Example 4

Baits according to the invention were prepared which contained potato preparation and brewer's yeast, only potato preparation or neither. Durum wheat was added as a classic bait component, so that the bait always consisted of 85% bait substances.

All lures contained the same amount of iron (iπ) phosphate and (1-1). In each case, 5 g of bait were placed in a box filled with 10 Arion snails, as well as some potato slices. Then the feeding on the slices was determined. The higher the feed, the less effective the bait.

It can clearly be seen that the baits according to the invention have a particularly good and also particularly long-lasting action.

Claims

claims

1. Containing composition

at least one molluscicidal active substance

a potato preparation obtainable by crushing and drying each optionally shelled or unpeeled raw or cooked potatoes and

Yeast.

2. Composition according to claim 1, containing

a) phosphonic acid esters of the formula (I)

M (I)

HO- P- R ° ^H

in which R is C 1 -C 10 -alkyl,

which is mono- or polysubstituted, identically or differently, by PO ₃ H ₂ , CO ₂ H, OH, NH ₂ , CN, halogen, C ₁ -C ₆ -alkylamine or C ₂ -C ₆ -dialkylamine and

which is optionally interrupted by 1-6 heteroatoms from the series N, O, S, P, wherein heteroatoms are not directly linked to one another;

and

Ammonium, alkali metal, alkaline earth metal and / or iron salts;

or

b) ammonium, alkali metal, alkaline earth metal and / or iron salts of the phosphonic acid esters of the formula (I)

or

c) Methiocarb or

d) Metaldehyde.

A composition according to any of claims 1 or 2, further containing

fine-grained cereal flour and / or

Binder and / or

other additives.

4. Use of a combination of potato preparation and yeast to improve the attractiveness of molluscicidal compositions for snails, wherein the

Potato preparation is available by pureeing and drying each optionally peeled or unpeeled cooked or raw potatoes.

5. Use of a combination of potato preparation and yeast according to claim 4, characterized in that the potato preparation of a molluscicidal

Composition in a final concentration of 10 to 50 wt .-% is added.

Use of compositions according to claim 1 for controlling terrestrial snails, characterized in that the composition according to claim 1 is applied to the habitat of the snails.

7. A process for the preparation of compositions according to claim 3, characterized in that

In step (1) a solution or suspension ("premix") of phosphonic acid ester of the formula (I) according to claim 2 or its salts, optionally in admixture with other metal salts,

and diluents, preferably water and

optionally one or more other molluscicidal active ingredients and optionally additives, such as preservatives, dyes, additives, etc. produces,

»In step (3) add enough water with mixing and kneading to make a dough,

In step (4) extruding and crushing the dough under pressure and

In stage (5), the particulate material is first pre-dried and then subsequently dried and then cooled to room temperature.

8. A process for the preparation of compositions according to claim 3, characterized in that

First preparing a premix of all the powdery constituents and then processing them into a dough with the solution of a phosphonic acid of the formula (I) according to claim 1, a diluent and a binder,

Extruded and crushed the dough under pressure and

• Pre-dry the particulate material before and then finish with drying and then cool to room temperature.

A method for controlling terrestrial snails, characterized in that compositions according to claim 1 are allowed to act on terrestrial snails and / or their habitat.