The RR in a Pakistani strain (PAK) was 2320, 4100 and 223-fold. IND strain was collected from India with more than 10000 fold resistance to cypermethrin. The synergisms of PBO and DEF on pyrethroids were tested in these strains.

• PAK品系来自巴基斯坦,对氰戊菊酯、氯氰菊酯和溴氰菊酯的抗性分别是2320、4100和223倍。