An estimation influences evoked by some natural insecticides on greenhouse pest-insects and mites
2001
Hiiesaar, K. | Metspalu, L. | Kuusik, A. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Plant Protection)
In the present research we compared the effect of three commercial preparations of natural origin - Neko (Finnish firm OY Neko AB), Neem (Scotts Celaflor GmbH and Co) and Phytoverm-0,2 per cent (Russian PharmBioMed) on the greenhouse pests - greenhouse whitefly, two-spotted spider mite , and tobacco thrips. Karate, a synthetic pyrethroid, served as a standard insecticide, whose efficacy was compared with the above-mentioned natural substances. All the natural preparations tested proved to be more effective against the eggs of two-spotted spider mite than the synthetic Karate, used as standard. About 90 per cent of eggs perished when Neem was applied, followed by Neko (84 per cent), Phytoverm (70 per cent) and Karate (42 per cent). From all the preparation tested, the Neko proved to be the most effective against the larvae and pronymphs of greenhouse whitefly causing the death of 90 per cent of the individuals. On eggs the effect was weaker than that of Neem, which prossessed strong ovicidal properties, Phytoverm and Karate did not reveal any action on the eggs because of low temperature. On the larvae and adults of tobacco thrips the effectiveness of Neko was on the same level with Karate used as standard. The efficacy of Phytoverm and Neem remained behind that of Neko and Karate. A shortcoming of Neko is its strong phytotoxicity to cucumber plants
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