ACARICIDAL POTENTIAL AND REPRODUCTIVE IMPACT OF MARINE ALGA, Laurencia obtusa COMPOUNDS AGAINST Tetranychus urticae (Koch) and, Panonychus ulmi (Koch)

Document Type : Research articles.

Authors

Department of Economic Entomology & Pesticides, Faculty of Agriculture, Cairo University, Egypt

Abstract

The red alga Laurencia obtusa (Huds), has long been known as
a reliable source of secondary metabolites. The toxicity of
dichloromethane extract and its fractions against Tetranychus
urticae (Koch) and Panonychus ulmi (Koch) spider mites was
assessed. Bioassay efficacy guided to isolate two halogenated
terpene and one nonterpenoid compounds. The latent effects of
three compounds were also investigated. The results showed that
the crude extract and its three fractions were active against both
mites. It was found that T. urticae was more sensitive than P. ulmi
to the isolated fractions of L. obtusa and to the reference acaricide
dicofol. The number of progeny and the longevity of the exposed
adults of both mites were used as criteria for the deleterious effects
of the fractions .It was observed that the three fractions showed
highly effect on the hatchability of eggs. Significant variations
were recorded on the reduction in total numbers of eggs/female
against the two mites.

Keywords

Files

Share

How to cite

Statistics