Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Nitrogen containing other than solely as a nitrogen in an...
Reexamination Certificate
2001-02-26
2002-05-07
Pryor, Alton (Department: 1616)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Nitrogen containing other than solely as a nitrogen in an...
Reexamination Certificate
active
06384082
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to novel slug and snail baits, to a process for their preparation and to their use for controlling slugs and snails.
BACKGROUND OF THE INVENTION
It is already known to control terrestrial slugs and snails using baits which comprise feedstuffs and molluscicidally active compounds, such as methiocarb, metaldehyde or metal chelates (cf. DE-A 35 03 608, DE 36 12 161 and WO 96-05 728).
Such slug and snail baits can be prepared, for example, by pressing one or more molluscicidally active compounds with feedstuff, carrier material, adhesives and other customary additives essentially dry into shaped articles. These baits have the disadvantage that they have a relatively rough surface, which causes undesirable abrasion during packaging, during transport and also during application. Moreover, it is unfavourable that these shaped articles are relatively unstable under the influence of rainwater, losing some of their activity owing to the beginning decomposition.
Furthermore, it is already known that slug and snail baits based on metaldehyde can be prepared by mixing the active component with the other constituents, but without adhesive, followed, after addition of water, by extrusion and processing into pellets. The activity of these shaped articles is good, but the physical properties under practice conditions are not always sufficient.
SUMMARY OF THE INVENTION
A slug and snail bait includes 3,5-dimethyl-4-methylthio-phenyl methylcarbamate, fine cereal flour, modified starch, a formaldehyde-releasing substance, and molasses.
DETAILED DESCRIPTION
This invention, accordingly, provides novel slug and snail baits, comprising
a) 3,5-dimethyl-4-methylthio-phenyl methylcarbamate of the formula,
optionally in a mixture with one or more other molluscicidally active compounds,
b) fine cereal flour,
c) modified starch and a formaldehyde-releasing substance,
d) molasses and
e) optionally additives.
Furthermore, it has been found that the novel slug and snail baits can be obtained when
(1) 3,5-dimethyl-4-methylthio-phenyl methylcarbamate of the formula,
optionally in a mixture with one or more other molluscicidally active compounds,
and optionally in a mixture with additives, is mixed and finely ground,
(2) the resulting premix is mixed with
fine cereal flour,
modified starch and a formaldehyde-releasing substance and then sprayed with molasses,
(3) the resulting homogeneous mixture is admixed with sufficient water to form a dough,
(4) the dough is extruded and comminuted and
(5) the resulting product is dried.
Finally, it has been found that the novel slug and snail baits are highly suitable for controlling terrestrial slugs and snails.
It is extremely surprising that the slug and snail baits according to the invention have a better stability than the prior-art shaped articles for the same intended use. It is particularly unexpected that the baits according to the invention, in spite of containing a relatively small amount of adhesive, are, in particular with respect to rain water, considerably more stable than corresponding baits prepared by dry pressing which contain a considerably higher quantity of adhesive.
The slug and snail baits according to the invention have a number of advantages. Thus, they have high abrasion resistance. It is furthermore favourable that they maintain their shape and activity even after prolonged watering.
The slug and snail baits according to the invention are characterized by the constituents listed under (a) to (e).
The molluscicidally active compound that is contained in the baits according to the invention is in each case 3,5-dimethyl-4-methylthio-phenyl methylcarbamate of the formula (I), which is known under the common name methiocarb.
Other molluscidically active compounds which may additionally be present are preferably metaldehyde and metal chelates, such as complexes of ethylenediamine-tetraacetic acid and iron or copper ions.
The cereal flours that may be contained in the slug and snail baits according to the invention are commercial flours, such as wheat flour, rye flour, rice starch, inter alia. Preference is given to durum wheat flour and wheat flour. The flour is present in a fine form, preferably in particle sizes below 250&mgr;.
In the present case, modified starch is to be understood as meaning commercial products of this type. Preference is given to cold-swelling maize starch.
As formaldehyde-releasing substances, the baits may comprise all customary products which are suitable for releasing formaldehyde. Preference is given to urea/formaldehyde condensates.
In the present case, molasses are to be understood as customary syrup-like mother liquors obtained in the manufacture of sugar.
Suitable additives which may be contained in the baits according to the invention are preferably preservatives, colorants, slug and snail attractants, grinding auxiliaries, bitter substances, homeotherm repellents and anticaking agents, and also water.
Examples of preservatives which may be mentioned are 2-hydroxybiphenyl, sorbic acid, p-hydroxy-benzaldehyde, methyl p-hydroxy-benzoate, benzaldehyde, benzoic acid, propyl p-hydroxy-benzoate and p-nitro phenol.
Examples of colorants which may be mentioned are inorganic pigments, iron oxide, titanium dioxide and Prussian Blue, and also organic dyes, such as anthraquinone, azo and metal phthalocyanine dyes.
Suitable slug and snail attractants are all customary substances suitable for this purpose. Examples which may be mentioned are plant extracts and derivatives thereof, and products of animal origin.
Suitable grinding auxiliaries are all substances which can customarily be used for this purpose. Kaolins, aluminas, talc, chalk, quartz powder and finely divided silica may be mentioned as being preferred.
Suitable homeotherm repellents which have a repellent effect on warm-blooded organisms, such as dogs or hedgehogs, are all components which are customary for this purpose. The example which may be mentioned is nonyloic acid vanillamide.
Suitable bitter substances are all substances which are customary for this purpose. An example which may be mentioned is denatonium benzoate.
Suitable anticaking agents are all substances which are customary for this purpose and which prevent lumping and caking. Examples which may be mentioned are moisture-adsorbing powders of kieselguhr, pyrogenic silica, tricalcium phosphate, calcium silicates, aluminium oxide, magnesium oxide, magnesium carbonate, zinc oxide, stearates and fatty amines.
The content of the individual components in the slug and snail baits according to the invention can be varied within a certain range. Thus, the concentrations
of active compound of the formula (I), optionally in a mixture with one or more other molluscicidally active compounds, are generally between 0.5 and 15% by weight, preferably between 1.0 and 13% by weight,
of cereal flour are generally between 60 and 90% by weight, preferably between 65 and 85% by weight,
of modified starch and formaldehyde-releasing substance are generally between 0.1 and 6% by weight, preferably between 0.2 and 5% by weight,
of molasses are generally between 1 and 10% by weight, preferably between 2 and 4% by weight, and
of additives are generally between 0 and 5% by weight, preferably between 0 and 3% by weight.
When carrying out the process according to the invention, preference is given to using those components which have already been mentioned as being preferred in connection with the description of the slug and snail baits according to the invention for the constituents listed under (a) to (e).
The quantities of the individual components are chosen such that the substances are present in the slug and snail baits according to the invention in the weight ratios mentioned above. However, the amount of water is such that a dough is formed in Step (3) of the process. In general, the amount of water used is between 25 and 35% by weight, preferably between 27 and 34% by weight, based on the other constituents. However, in the slug and snail baits according to t
Schnorbach Hans-Jürgen
Wirth Wolfgang
Bayer Akitengesellschaft
Gil Joseph C.
Pryor Alton
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