A life-history trait of the Asian corn borer, Ostrinia furnacalis (Lepidoptera: Pyralidae)-positive correlation between body weight and temperature
HE Hai-Min1, XIAO Liang2, CHEN Qian-Wu3, XUE Fang-Sen1,*
(1. Institute of Entomology, Jiangxi Agricultural University, Nanchang 330045, China; 2. Agricultural Technology Extension Station of Songhu Town, Xinjian, Jiangxi 330107, China; 3. Plant Protection Station of Yongxiu County, Yongxiu, Jiangxi 330300, China)
Abstract 【Aim】 Temperature is the most important environmental factor for ectotherms and affects all aspects of lifehistory traits. This study aims to understand how lifehistory traits vary with temperature in the Asian corn borer, Ostrinia furnacalis. 【Methods】 The developmental duration from egg hatching to pupation and from pupation to adult eclosion, and the pupal and adult weight were examined in the Nanchang population of O. furnacalis at 20, 22, 24, 26, 28, 30 and 32℃ under a photoperiod of 16L∶8D in the laboratory. 【Results】 The larval and pupal duration and total developmental duration of O. furnacalis were significantly decreased with the increasing of rearing temperature. The larval duration and total developmental duration were significantly shorter in males than in females, showing the protandry phenomenon. The growth rate was positively correlated with temperature. The growth rates of females were significantly lower than those of males at low temperatures but significantly higher than those of males at high temperatures. The relationship between body weight and rearing temperature in O. furnacalis did not follow the temperature-size rule, and both males and females gained heavier body weight at high temperature. Females were significantly larger in size than males at all temperatures, showing a female biased sex size dimorphism (SSD). Contrary to Rensch’s rule, the SSD index and body weight of O. furnacalis tended to increase with rising temperature. Male pupae lost significantly more weight at metamorphosis compared to females, resulting in higher SSD index in adults than in pupae. 【Conclusion】 High temperature not only significantly shortens developmental duration, but also results in heavier body weight at maturity in O. furnacalis. There are significant differences in life-history traits between females and males of O. furnacalis.
HE Hai-Min,XIAO Liang,CHEN Qian-Wu et al. A life-history trait of the Asian corn borer, Ostrinia furnacalis (Lepidoptera: Pyralidae)-positive correlation between body weight and temperature[J]. ACTA ENTOMOLOGICA SINICA, 2018, 61(3): 340-347.