DD265784A1 - MEANS OF INCREASING AND EXTENDING THE ADHESIVITY OF PREPARATIONS BASED ON INSECT PATHOGENIC VIRUSES (WAESSED PREPARATIONS) OF PLANT MATERIAL FOR THE TREATMENT OF HARMONY - Google Patents

Abstract

Means for increasing and prolonging the adherence of preparations based on insect pathogenic viruses to plant material for controlling noxious insects. The invention relates to the addition of wasserverduennbaren Disperionen of polymers without organic Loesungsanteile, especially Polyvinylazetatlatex types to aqueous treatments of preparations of insect pathogenic viruses, applied to plants in agriculture, horticulture and forestry for the control of insect pests. The addition of the polymer dispersions forms on the treated plants a polymer film which is resistant to rain and increases the adhesive capacity of the virus particles on the plant surface. The insect pathogenic effect of the viruses is not impaired thereby. By applying such mixtures, the effectiveness of the virus particles is increased in comparison with insect pests and their duration of action is prolonged. The agents according to the invention are added to the aqueous virus preparation in a proportion of between 0.1% and 40%.

Description

Example for testing the effect of the additive according to the invention on aqueous preparations of insect pathogenic viruses (Kohler nuclear polyhedron virus) on larvae of the charcoal (Mamestra brassicae L.) and the damage caused by feeding on cabbage plants.

treatment " mortality rate Feeding damage ²¹ after 3 weeks variant after 2 weeks +++ virus 85% + ++ Virus + latex (1%) 71% ++ ++++ Latex (1%) 76% ++ + ++++ Control (H ₂ O) 0% ++++

"Virus Concentration 1 ²¹ Food damage +

10 * polyhedra / ml

low

medium

strongly

very strong

Claims (3)

1. A means for increasing and prolonging the adhesion of preparations based on insect pathogenic viruses (aqueous preparations) to plant material for controlling noxious insects, characterized in that the aqueous virus preparations are added to 40% water-dispersed polymers, preferably polyvinyl acetate, in addition to conventional dispersants, wherein the addition of about 0.1% wetting agent is recommended, and the mixture is applied at a rate of 100-1500 l / ha in orchards and forestry and 400-1000 l / ha in vegetable crops or in agricultural crop stands. 2. Composition according to claim 1, characterized in that the agents according to the invention weraen instead combined with insect pathogenic virus preparations with other insect pathogens. 3. Composition according to claim 1, characterized in that the compositions according to the invention are combined with further crop protection products which are gentle on the beneficial agent. Field of application of the invention The invention relates to novel additives to crop protection preparations based on insect-pathogenic viruses, which are applied to plants in agriculture, fruit growing, horticulture and forestry to combat insect pests, and which increase and prolong the adhesiveness of the preparations to plant material. Characteristic of the known state of the art Insect pathogenic viruses are currently being applied to plants in aqueous suspensions to control noxious insects. Milk powder is sometimes added as an adhesive (Gröner et al., 1978). The adhesiveness of these formulations in dry weather is about 4-5 days. As a result, the effectiveness of a treatment against certain insect pests significantly affected, especially in insects with long flight times. If, however, precipitation sets in after treatment, then with the current adhesives there is no longer any adherence of the virus preparations. In such cases, several treatments are required at intervals of a few days. Object of the invention The aim of the invention was therefore the development of well plant-compatible, well-adhering to plant material agents which do not interfere with their insect pathogenic activity when mixed with virus preparations, are rain resistant and have a duration of adhesion of at least 6-8 weeks. Explanation of the essence of the invention The object of the invention was to find an additive for preparations based on insect-pathogenic viruses, the aqueous suspensions of the viruses are buried and ensure the applicability of the viruses to the plant parts for several weeks after application to the plants, the effect of the viruses not adversely affect and are well tolerated by plants. The object is achieved in that are used as additives to preparations based on insect pathogenic viruses water-dilutable dispersions of polymers without organic solvent components, of which Polyvinylazetat latex types prove particularly useful. These are very good plant tolerant and adhere even after precipitation of the treated plant material up to 8 weeks. They do not affect the effect of insect pathogenic viruses against insect pests. The polyvinyl acetate latex types contain a number of conventional auxiliaries, such as thickeners, plasticizers, emulsifiers, small amounts of inorganic salts and preservatives, which do not have a negative impact on the task. The agents according to the invention are added to the aqueous virus preparation to 0.1% to 40%. embodiment The agents are mixed in the specified concentration with the aqueous virus preparation and sprayed with the usual application technique. Favorable is the addition of 0.1% wetting agent to the spray mixture. The PUanzen are uniformly sprayed to achieve the Wirkführig invention until it forms a uniform, thin coating. The covering is rain resistant and retains its adherence to plant material for up to 8 weeks. Plant damage does not occur.