相对湿度对苹小卷叶蛾实验种群的影响

为明确相对湿度对苹小卷叶蛾生长发育及繁殖的影响,在室内(25±1) ℃和12L∶12D条件下,分别设置40%、50%、60%、70%、80%、90% 6个相对湿度(RH),研究其对苹小卷叶蛾生长、发育、存活及繁殖的影响.结果表明: 在40%～90%RH范围内,随湿度升高苹小卷叶蛾未成熟期逐渐缩短,由40%RH时30.31 d缩短至90%RH的25.87 d,未成熟期存活率逐渐升高.湿度对卵的孵化具有显著影响,40%RH下卵的孵化率最低,为39.3%.在80% RH条件下,成虫寿命最长,单雌产卵量最多(110.8粒),卵和幼虫的存活率最高,净生殖率(R₀)和内禀增长率(r_m)最高,分别为26.46和0.1018．说明较高湿度能促进苹小卷叶蛾生长发育,提高其繁殖力.

Influence of relative humidity on the Adoxophyes orana experimental population.

In order to explore the effects of relative humidity (RH) on the population growth of summer fruit tortrix moth Adoxophyes orana, the development, survival, fecundity and longevity of A. orana were assessed at 6 different constant humidities (40%, 50%, 60%, 70%, 80% and 90%), (25±1) ℃ and a photoperiod of 12L:12D in the laboratory. The results showed that immature developmental time was gradually shortened with the increasing humidity at 40%-90%RH, ranged from 30.31 d at 40%RH to 25.87 d at 90%RH. However, the survival rate for immature moth was gradually increased from 40%RH to 90%RH. Hatchability was inhibited significantly by low humidity and the lowest was 39.3% at 40%RH. And at 80% RH, the longevity of adults was the longest, the oviposition was the most (110.8 eggs per female), and the survival rates for eggs and larvae were the highest. It resulted in the highest net reproductive rate (R₀=26.46) and intrinsic rate of increase (r_m=0.1018). In conclusion, the development and fecundity of A. orana were promoted and improved at the higher humidity.