(4) among the smearing agents for controlling the third instar larva, 20% Imidacloprid soluble liquid (1:10 dilution) had better effect, which effectiveness was 90%.

• 涂干防治3龄若虫期供试的几种药剂中，20%25吡虫琳可溶性液剂1:10的稀释液防效达到了90%25以上。