Fumigant, Contact Toxicity and Progeny Deterrent from Lantana camara L. oil Against Lesser Grain Borer, Rhyzopertha dominica (Fabricius) (Coleoptera: Bostrychidae)

Abstract

Efficacy of essential oil from Lantana camara L. as the fumigant, contact toxicity and progeny deterrent were tested against lesser grain borer, Rhyzopertha dominica (Fabricius). Concentrations of essential oil from L. camara at 0, 20, 40, 60, 80 and 100 μμl/ml were applied with 5 replications. The experiment was conducted at biology laboratory under 25-27°oC and 75-80% RH conditions. Results showed that the fumigant, contact toxicity and progeny deterrent of essential oil from L. camara on the lesser grain borer were effective when compared with control. At concentration of 100μ μl/ml, using it as fumigant gave 70% mortality with the LC50 value of 76.45μ μl/ml at 24 h, while the contact toxicity gave 94% mortality with the LC50 value of 50.00μ μl/ml at 24 h. For progeny deterrent effects, using the same concentration of essential oil and starting from 5 pairs of parent, the number of derived progeny was 1.80 ± 0.74 adults, percentage of progeny deterrent was 94.11 and the time of development was 54.40 ± 1.62 days. Whereas in control, the number of progeny was 30.60 ± 2.55 adults, percentage of progeny deterrent was 0.0% and the time of development was 28.60 ± 3.35 days.