INTERACTIONS AMONG THE LARVAL ENDOPARASITOID Microplitis rufiventris KOK. (HYMENOPTERA; BRACONIDAE), ITS HOST Spodoptera liltoralis (BOISD.) (LEPIDOPTERA; NOCTUIDAE) AND SPINTOR 24 SC.

Document Type : Original Article

Authors

Department Of Biological Control, Plant Protection Research Institute, Dokki, Giza, Egypt

Abstract

Spintor is a new insecticide from natural resource, the active ingredient is spinosyns A and D, which are secondary metabolites from the aerobic fermentation of Saccharopolyspora spinosa on nutrient media.
Effect of Spintor treatment on the larval parasitoid Microplitis rufiventris Kok. was evaluated. Pre- and post-feeding of S. littoralis 2nd instar larvae on castor leaves treated with different concentrations of Spintor had adverse effect on the development of the parasitoid immature stages. Prolongation of the development periods (egg- larval duration and pupal stage) and decreasing of adult longevity were recorded when concentrations of 0.188 and 0.125ml/L water were tested. At concentrations of 0.188, 0.125, 0.0625 and 0.0313ml/L percentages of immerged parasitoids were decreased.
The combined effect of Spintor and parasitism led to an obvious increase in host mortality compared to the treatment with Spintor alone: 4-days Lc50 values for parasitized and unparasitized larvae were 0.194 and 0.239 ml/L respectively.

Keywords

Journal of Plant Protection and Pathology
Volume 30, Issue 3
March 2005
Pages 1693-1700

Files

Share

How to cite

Statistics