Biology of Green Scale (<I>Coccus viridis</I> Green) and It’s Control by Insecticides and Entomopathogenic Fungi in Coffee Plantation

Abstract

Biology of green scale, Coccus viridis Green, and efficacy of various insecticides and entomopathogenic fungi were studied. The green scales were reared on coffee seedlings better than gardenia plants in cage under rainproof greenhouse (28.9 ±1.84 ºC and 62.5 ±9.82% RH).  Size of egg, nymph at instar 1-3 and adult were 0.16 ±0, 0.22 ±0.02, 0.56 ±0.15, 0.98 ±0.05, 1.69 ±0.02 millimeters in width, respectively and 0.26 ±0.01, 0.43 ±0.03, 1.13 ±0.31, 2.02 ±0.01 and 2.92 ±0.01 millimeters in length, respectively. An efficacy test of 4 insecticides white oil, azadirachtin, buprofezin and Beauveria bassiana was carried out in rainproof greenhouse. All treatments were able to decrease number of scale insects significantly different from untreated control but no significantly different among insecticide treatments. In field test all treatments were done in the same pattern. Buprofenzin at 0.025% a.i. was the most effective of controlling green scale and the survival rate was 17.50% comparing to 83.33% in untreated control at day 16. The latex from green papaya and water at the ratio 1:1 to 1:5 reduced number of scales down from 51.62% to 5.60 to 11.16% of control respectively.