Plant husbandry – Process
Patent
1996-11-07
1999-09-14
Wax, Robert A.
Plant husbandry
Process
47 576, 71 6, 71 7, 71 6409, 800298, A01B 7900, A01C 106, C05F 1108, A01N 2500
Patent
active
059503602
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the use of water-containing gel formulations for dressing seed.
It has already been disclosed to dress seed with dry pulverulent formulations of pesticidal active compounds in customary mixers. However, a disadvantage of this method is that such powders adhere only poorly to the surface of the seed and therefore some of the active compound is lost by abrasion. It is also a disadvantage that seed dressed with dry powders dusts during use and this causes trouble to or even endangers the user.
It is furthermore known to dress seed by mixing powder formulations with water and stirring the slurry dressings thus formed with the seed in suitable apparatuses. What is detrimental about this method of seed treatment is that the mixture must be kept homogeneous by constant stirring, because otherwise incorrect dosages which jeopardise the success of the dressing easily occur. It is furthermore a disadvantage that as a result of the addition of water, the moisture content of the seed increases, which means that the storage stability is reduced in some cases. Finally, slurry dressings are prone to dusting off from the surface of the seed during long mixing times, so that a loss in active compound may occur, as in the case of dry dressing.
It is furthermore known to employ dressings of pesticidal active compounds in the form of solutions, emulsions or suspensions. However, these methods of seed treatment are also not always satisfactory. Thus, moist dressings often comprise organic solvents, which may pollute the environment or may impair the seed tolerance of the dressings. Emulsion dressings and suspension dressings must be further diluted by addition of water before use, so that an adequately uniform distribution of the active compounds on the seed is achieved. This is a disadvantage above all if batch mixers are used and in the case of yard dressing, because the moisture content of the seed is greatly increased by the high water content and the storage stability of the seed is therefore limited to a considerable extent.
A process for seed dressing is furthermore known which comprises first mixing the seed with an aqueous formulation which comprises at least one pyrethroid and at least one binder, and then treating it with at least one pulverulent fungicide (cf. DE-OS (German Published Specification) 4 220 931). This dressing method produces good results, but is relatively complicated since the seed treatment is carried out in two steps.
Pesticide formulations in gel form and their use for the preparation of aqueous spray liquors have furthermore already been described (cf. EP Published Specification 0 449 773 and EP Published Specification 0 518 689). However, a use of gels for dressing seed is not mentioned.
It has now been found that gel formulations which comprise
It is to be described as extremely surprising that the gel formulations according to the invention can be employed for dressing seed. In particular, on the basis of the prior art already known, it was to be assumed that gels cannot be applied to seed sufficiently uniformly and with sufficient abrasion resistance. In contrast to expectations, however, the gels which can be used according to the invention produce a firmly adhering deposit on the grains of the seed, which also withstands mechanical stresses to an adequate degree.
The use according to the invention of gel formulations is distinguished by a number of advantages. Thus, before use of the gels, no further dilution with water is necessary. The moisture content of the seed is thus not noticeably increased and the storage stability of the treated material is retained. Since the gels furthermore are distributed sufficiently uniformly on the surface of the seed and have excellent adhesion, hardly any losses of active compound by abrasion occur. It is also particularly advantageous that the dressings in gel form can be employed in exactly the desired amount in each case, so that incorrect dosages can be avoided. It is furthermore to be mentioned that the dressings in
REFERENCES:
patent: 4161397 (1979-07-01), Bellet et al.
Heinrich Gunter
Weber Erhard
Zimmermann Manfred
Bayer Aktiengesellschaft
Saidha Tekchand
Wax Robert A.
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