Field Trial of Three Plant Extracts against Tetranychus urticae Population as a Comparative with Acaricidal (Abamectin) on Two Vegetable Crops

Abstract

Effects of thorn apple or jimsonweed Datura stramonium (Solanaceae) leaves, Egyptian henbane Hyoscoyamus muticus (Solanaceae) flowers and physic nut Jatropha curcas (Euphorbiaceae) seeds. Extracts were studied for their efficacy against Two-spotted spider mite Tetranychus urticae comparative with acaricidal Vertemic. The plants were extracted by Acetone and spraying on eggplant crop Solanum molongena (Solanacae) and bean crop Phasolus vulgaris (Fabaceae) at concentration 4% in infected fields. The reduction percentages of the population were determined after 1, 3, 7, 14 and 21 days from treatments and data were analysed by Anova table and mortality percentages were calculated by Abbot’s formula. From these study it was concluded that, the plant extracts are more effective as acaricides because they recorded highly reduction percentages for T. urticae. D. stramonium reach 92.30 and 94.12 mortality on eggplant and bean respectively, J. curcas recorded 90.58 and 90.56% reduction percentages on S. molongena and P. vulgaris respectively while the extract of H. muticus recorded 95.40 and 87.46% mortality rates on the same crops respectably. On the other hand Vertemic was more effective on T. urticae.