Preventive Effect of Different Concentrations of Three Kinds of Agents on Notobitus meleagris

To explore the pollutionfree prevention method and control of Notobitus meleagris, 1% matrine SL (smoke type), 1.2% matrinenicotine missible oil, and 1.8% Avermectin missible oil were selected to test the preventive effect on control of the nymph and adult of N. meleagris at Shaxian County, Fujiang province in 2003. The result showed that, after 3 d of spray matrine and Avermectin missible oil by smoke spray technology, the preventive effect on nymph and adult was more than 80%. In which, the optimum agent dosage for two kinds of matrines was 1∶9, while 1∶40 was the best dosage for Avermectin missible oil.