Appraisal role of some Bio-Control agent, botanical oils and a traditional insecticide against onion thrips Thrips Tabaci (Lindeman)

Hanaa E Sadek; Dalia E Lotfy; Marwa MAEl-Sabagh

Appraisal role of some Bio-Control agent, botanical oils and a traditional insecticide against onion thrips Thrips Tabaci (Lindeman)

Authors
Hanaa E Sadek, Dalia E Lotfy, Marwa MAEl-Sabagh

Abstract
Thrips raid a number of crops mainly thrips of onion producing large economic destruction on onion yields. Typically young leaves are preferred, and then buds and flowers too get infected. Botanical insecticides, entomopathogenic fungal and two plant oils (Moringa, Moringa oleifera L. and bitter almond, Prunus amygdalus var amara) are highly effective toward Thrips Thrips, beside it safe and ecologically acceptable. Beauveria bassiana, Metarhizium anisopliae and Paecilomyces lilicanus produced moderately the same effect on Thrips tabaci however the best one was Beauveria bassiana was recorded 90% death at 10⁸ spores/ ml. conc. Typically, the great concentration 10⁸ spores/ ml. produced the best death percentage particularly after 2 days of dealing all tried fungi. But both Metarhizium anisopliae and Paecilomyces lilicanus have the same mortality which recorded 82% and 82% at 10⁸ spores/ ml. Concentrations of two tested oils (bitter almond and moringa) were caused mortality to thrips after 48 hr. of exposure reaching to 73 % in bitter almond but moringa recorded 17 %. On the other hand the concentrations of a conventional insecticides Pleo^® were caused mortality approximately equal mortality to Entomopathogenic Fungi and botanical oils. The aim of this research was to assess the efficacy of Entomopathogenic fungi and botanical oils against onion thrips T. tabaci and compare it with a conventional insecticide under laboratory conditions.

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