Apolygus lucorum has become one of the most pestiferous pests of cotton and fruits with widely applications of transgenic Bt cotton in China. Cold tolerance of its overwintering eggs was studied, and the content of biochemical substances was also determined, to evaluate its overwintering adaptability. The results showed that there were significant differences on cold survival ability of the overwintering eggs among months. Lt50 of the overwintering eggs was in order of January > February > December > March > April at the temperature of-10 ℃ or-20 ℃ , and in order of January > December > March >February > April at the temperature of-30 ℃. The mortality of protected eggs in the April (4. 32% , 5. 36% , 5. 42% , 6. 79% and 7. 63%) was significantly lower than non-protected eggs in the April (46. 06% , 51. 84% , 54. 59% , 63. 07% and 74. 41%) when they were treated at the temperature of-20 ℃ for 1, 2, 3, 4 and 5 days. The cold
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