EFFECTS OF THE NEEM EXTRACTS ON OVIPOSITION AND EGGHATCH OF APRIONA GERMARI(COLEOPTERA,CERAMBACIDAE)
The branches of Broussonetia papyrifera Lin n. were treated with neem extracts(Neem EC) as the food of the beetle (Apriona germari Hope), the effects of neem extracts on the oviposition and egg hatch of the b eetle were investigated. The testing pair beetles were put into the plastic cont ainers with a diameter of 25 cm and of a height 25 cm and covered with iron scre en. During 15 days testing period, the average egg number laid per pair beetle s per day in treated group (7 pairs), which were fed on branches treated by neem extracts containing 50×10-6 g/mL azadiractin was 2.00±1.56 and that in the control group (7 pairs) was 10.33±3.33. T-test showed significant differen ce in the values of the average egg number laid between treated and control grou ps. In the test with a dosage of the neem extracts containing 100×10-6 g/ mL azadirachtin, in the treated group (7 pairs), the beetles began to die on the fifth day and all the beetles were died on the eighth day, their average egg nu mber laid per pair for the living be etle pairs per day, was 1.00±1.41 and that for the control group was 13.73±2.9 0. T-test showed the difference between the two values was significant. The hat ching rate of the eggs laid by the beetles, which had fed on the treated branche s with a dosage of neem extracts containing 50×10-6 g/mL azadirachtin, re ached 33.3% at the nineteenth day. However, that of eggs laid by the control bee tles was 98.9% on the ninth day. During a 24 days\' choice test of feeding, the branches were treated with a dosage of the neem extracts containing 100×10 -6 g/mL azadirachtin and the average food taken by the beetles in the treated group (7 pairs) was 3.53±0.38g per pair per day and that on the control group(7 pairs) was 3.42±0.60g per pair per day. T-test showed that the difference bet ween the two values was insignificant. It indicated that the beetle could not d istinguish the food treated with neem extracts, that is, neem extracts is not an antifeedant for the beetle. Based on the above results a new way using neem ext racts to control the beetle was put forward and discussed.
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