Topraktan izole edilen bazı Streptomycetes türlerinin Leptinotarsa decemlineata (Say, 1824) (Coleoptera, Chrysomelidae) ergin ve larvalarına karşı insektisidal etkileri

Abstract

Thirty-seven Streptomycetes strains isolated from different soils and geographical areas in Turkey were used in this study to investigate the insecticidal effects of their three different solutions (A, B, C) on 1-4 th instar larvae and adults of the Leptinotarsa decemlineata (Say.) (Coleoptera: Chrysomelidae). The solutions (A, B, C) of 37 strains were given to larvae (1-4 instar) and adults of L. decemlineata through the food plant (potato leaves). Following eight days of bioassay, larvae showed different signs before death; generally the larvae displayed sluggishness, loss of appetite and depth of color. As in larvae, during bioassays, adults showed different signs before death; generally the adults displayed sluggishness, loss of appetite and depth of color. According to this study; considerable lethal effect of some Streptomycetes sp. were observed on the larvae (1-4 instar) of L. decemlineata , 93.1% larval mortalities caused by (C) solution of Streptomycetes strains M1483 and M1282; 96.6% larval mortalities caused by (B) solution of Streptomycetes strain M3024 and 98.3% larval mortalities caused by (A) solution of Streptomycetes strain M4010. On the other side, no significant mortality effect of Streptomycetes strains was observed on adults of L. decemlineata . Only Streptomycetes strains (B) solution showed 56.4% mortality at M7002. Results of this study indicate that some Streptomycetes strain solutions have a potential use in the bio-control of L. decemlineata.