Repellent activity of Sirinol® (Garlic emulsion) on adults of Rhizopertha dominica (F.) and Sitophilus oryzae (L.) with two laboratory methods

Abstract

The natural products of plants come as an alternative ecologically more compatible

in substitution to the synthetic insecticides. This study had the objective

to evaluate the action of 85% Sirinol

® EC (5% of alicin extracted from

garlic bean, 75% of fuel oils, 20% of surfactant and retentive) on

Rhizopertha

dominica

(F.) and Sitophilus oryzae (L.) in the adult phase in stored wheat,

through the assessment of repellent effect on exposed individuals to wheat

grains treated. Therfore, adults of

R. dominica and S. oryzae through the use

of two methods

â€Petriâ€dishes and olfactometer Y shape tube†were exposed

to 0.5, 1, 5 and 10% concentration of Sirinol

® and Percentage Repellency

(PR) was determined. In each of two methods, the maximum PR of Sirinol

®

was at concentration of 10%, with the recorded values 71.58% and 50.26%

for adults of

R. dominica and, 75.79 % and 62.96% for S. oryzae in Petridishes

and Y

†shape olfactometer tube methods, respectively. It was shown

that

S. oryzae were more sensitive to Sirinol® than R. dominica. The interaction

between concentration and time (concentration × time) was not significant

for adults of two species.