Effects of Crude Extract from Fever Vine (<I>Paederia linearis</I> Hook. f.) in Controlling Rice Weevil (<I>Sitophilus oryzae</I> L.)

Abstract

The problem in rice storage is infestation and destroy by insect pests of rice. Especially, the rice weevil, Sitophilus oryzae L., is one of the major insect in rice production in Thailand.  The objective of this study is the effect of extract from fever vine as the repellent, insecticidal and progeny deterrent on rice weevil. The various concentrations of extract from fever vine 0, 0.25, 0.5, 1, 2, 4 and 8% (w/v) were applied. The treatments were arranged in a completely randomized design (CRD) and replicated 5 times on 10 adults. The experiment was conducted at laboratory biology. The results found that the repellent, insecticidal and progeny deterrent of extract form fever vine on the rice weevil were significantly effective (p<0.05) when compared with the control. At the concentration of 8%, of extract form fever vine were the highest effective as the repellent, insecticidal and progeny deterrent on rice weevil. The repellent of rice weevil was 9.60 + 0.48 adults (PR=92%) at 12 h and the highest 10.0 + 0.00 adults (PR=100%) at 24 h. The percent of mortality on the rice weevil was the highest value 100% and the LC₅₀ value with 1.62 and 0.89% at 24 and 48h, respectively. The progeny deterrent, the number of progeny was 0.40 + 0.48 adults, percent of progeny deterrent was 98.84% and the time of development was 52.20 + 1.72 days. Whereas the control, the number of progeny was 34.60 + 3.55 adults, percent of progeny deterrent was 0.0% and the time of development was 29.60 + 0.74 days.