REPELLENCY, TOXICITY AND BIOLOGICAL EFFECT OF SOME PLANT EXTRACTS ON EGG AND ADULT FEMALE STAGES OF EUTETRANYCHUS ORIENTALIS (KLEIN)

EBRAHIM, HUSSEIN M.; ABDEL-SAMED, MAGDY A.; EL-SAFTE, AZEZA F.

doi:10.21608/ejar.1997.404755

REPELLENCY, TOXICITY AND BIOLOGICAL EFFECT OF SOME PLANT EXTRACTS ON EGG AND ADULT FEMALE STAGES OF EUTETRANYCHUS ORIENTALIS (KLEIN)

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt

10.21608/ejar.1997.404755

Abstract

Repellency and toxicity effects of plant extracts of citrus, spearmint, cumin and marjorum on egg and adult female stages of E.orientalis was studied. Citrus extract gave the highest degree of repellency followed by cumin, marjorum and spearmint extract on adult female after 24, 48 and 72hr. of treatment. On the basis of the LC50 values, the toxic effect of citrus extract was 333.33, 866.66 and 678.57 folds as that of majorum, against 1,2 and 3-days old eggs of E.orientalis, respectively, while cumin and spearmint were the 2nd effective toxicants. On the other hand, the spearmint extract was found to be the most effective toxicant on the adult female of E.orientalis. Citrus extract treatments with sub-lethal doses (LC30 level) on the eggs of 3-day old resulted in a reduction in number of deposited eggs by female during first and second generations.