The resistance to emamectin benzoate, tebufenozide, chlorfenapyr, methomyl of field populations of diamondback moth Plutella xylostella from six counties in Pearl River Delta was detected by leaf dipping method in 2008.The results showed that the resistant factors of diamondback moth to emamectin benzoate varied from 1.08 to 41.86.In the six tested populations,one was high resistant,one was moderate resistant and four were low resistant to emamectin benzoate.The resistant factor to chlorfenapyr ranged from 5.38 to 22.73.Among the six tested populations, three were moderate resistant and three were low resistant to chlorfenapyr.The resistant factors to tebufenozide were from 3.05 to 86.38.Among the five tested populations,two were high resistant, two were moderate resistant and one was low resistant to tebufenozide.The resistant factor to methomyl differed were from 9.56 to 190.32 ( except the population from Shantou ).In the six tested populations, two were very high resistant, two were high resistant, one was moderate resistant and one was low resistant to methomyl.%采用浸叶法测定了2008年珠三角6个地区小菜蛾对甲氨基阿维菌素苯甲酸盐、溴虫腈、虫酰肼和灭多威的抗药性.结果表明,珠三角地区小菜蛾对甲氨基阿维菌素苯甲酸盐的抗性倍数介于1.08~41.86,所测试的6个田间种群有1个种群对甲氨基阿维菌素苯甲酸盐表现出高抗水平,有1个种群表现出中抗水平,4个种群表现出低抗水平;对溴虫腈的抗性倍数介于5.38~22.73,所测试的6个田间种群中,有3个种群对溴虫腈表现出中抗水平,有3个种群表现出低抗水平;对虫酰肼的抗性倍数介于3.05~86.38,所测试的5个田间种群有2个种群对虫酰肼表现出高抗水平,有2个种群表现出中抗水平,有1个种群表现出低抗水平;对灭多威的抗性倍数介于9.56~190.32(汕头种群除外),所测试的6个田间种群有2个种群对灭多威表现出极高抗水平,有2个种群表现出高抗水平,有1个种群表现出中抗水平,有1个种群表现出低抗水平.
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