[Biological efficiency of muscardine fungi in relation to pest insects]
2006
Prishchepa, I.A. | Kolyadko, N.N. | Shinkorenko, E.G.,National Academy of Sciences. Scientific and Practical Center for Arable Farming (Belarus). Institute of Plant Protection
The estimation of efficiency of a preparation NeemAzal – T/S, EC on crops of white cabbage against complex of pests has shown, that this insecticide possesses high toxicity in relation to harmful entomofauna and is small toxical for useful insects . Obtained data testify perspectivity of its application in vegerable-growing facilities of republic. It is necessary to emphasize especially, that for achievement of the greatest efficiency, processing of crops of white cabbage by NeemAzal – T/S, EC at norm of the charge of 2,5 l/ha it is necessary to spend when Lepidoptera pest caterpillars of 1-3 age prevail, and larvae of cabbage aphids - to their initial stage of their life. Under production conditions biological efficiency of insecticide of vegetative origin against complex of Lepidoptera pest changed from 82 up to 100 %. Destruction of aphids - from 79 up to 84 %. At the stretched period of setting of cabbage plants by phytofaga and at their number above harmfulness threshold the treatment by the prepararation should be repeated. High sensitivity to the preparation is noted at cabbage moth caterpillars (100 % destruction for the 7-th day after processing). Number of cabbage white butterfly caterpillars under influence of NeemAzal – T/S, EC at norm of the charge of 2,5 l/ha decreased on 92,7 %, and cabbage cutworm - on 82 %. According to monitoring dynamics of number of pests in crops of cabbage, increase of density of sucking insects is noted in 2,5 weeks after the first processing. The density of Lepidoptera pest caterpillars and cabbage aphid exceeded a threshold level in all variants of experience that has demanded repeated (8.08) carrying out of protective actions for decrease in their harmfulness.
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