Results The cypermethrin preparation could control pests for 2 months,but the effective duration of cypermethrin confected by chitosan was more than 3 months.

• 结果单纯氯氰菊酯制剂的持效时间为2个月左右,壳聚糖复配的氯氰菊酯制剂的持效时间至少为3个月。