EFFECT OF SEVERAL INSECTICIDE AGAINST OIL PALM POLLINATOR’S WEEVIL, ELAEIDOBIUS KAMERUNICUS (COLEOPTERA: CURCULIONIDAE)

Abstract

Study on the effect of pesticide application against Elaeidobius
kamerunicus population was carried out in lab scale. The study
was divided into two parts which are the direct effect against the
weevil and indirect effect against the eggs. Cypermethrin
showed the highest toxicity level compared to the other types of
pesticides as the application eliminate all weevil population
after one day of application (DAA). The mortality rate of weevil
was significantly different only on the first day after application
(F= 268.86, p<0.05). Result of our field study indicate that there
were significant different in the number of weevil resurgence
between the pesticide application and control (F= 93.75 p<0.05)
except for Bacillus thuringiensis. The application of
cypermethrin, chlorantraniliprole and Bacillus thuringiensis had
a negative effect on the weevil directly. Meanwhile, the application of B. thuringiensis did not affect the eggs of E. kamerunicus.