Study of the repellent effect of the insect extract of the mealybug Planococcus cirit on first-phase nymphs of the mealybug Nipaecoccus viridis

Abstract

The research on field experiments is conducted at (1 March 2021 - 1 January 2022) in the woody plant canopy / Department of Biology / College of Education for Pure Sciences / University of Anbar, and the second part included laboratory experiments that are conducted in the laboratories of the Department of Biology / College of Education for Pure Sciences / University of Anbar to study the repellent effect of the ethanolic extract of Planococcus citri on the mealybug Nipaecoccus viridis nymphs.The results have shown that there is an effect of the ethanolic extract of Planococcus citri on the repellency of Nipaecoccus viridis nymphs, where the higher concentrations of the extract achieved stronger repellency efficacy than the lowest concentrations. The repellency percentage reached at the concentration 10000 ppm (56.7%) after one hour of exposure and 73.3% after 6 hours of exposure, and the lowest percentage of repellency at the 2000ppm concentration is 10.0% after an hour of exposure and 16.7% after 6 hours of exposure. While the 4000ppm concentration achieved a repellency rate of 33.3% after an hour of exposure and 53.3% after 6 hours of exposure. The centrifugal force in these concentrations ranged between the first, third and fourth classes.