Anhui-CABI Joint laboratory for Agricultural Pest Control, Institute of Plant Protection and Agro-Products Safety, Anhui Academy of Agricultural Sciences, Hefei, PR China.
Crop Research Institute, Anhui Academy of Agricultural Sciences, Hefei, PR China.
Environ Entomol. 2021 Oct 12;50(5):1151-1157. doi: 10.1093/ee/nvab066.
Holotrichia oblita (Faldermann) (Coleoptera: Scarabaeidae) is a major soil insect pest that damages forest trees, crops, and lawns. Adults of H. oblita fly, forage, and mate at night but remain underground during the day. We studied the effect of photoperiod on H. oblita reproduction. H. oblita females laid more eggs at 8:16 (L:D) h and 0:24 (L:D) h than other photoperiods. As the scotophase increased, the preoviposition period decreased and the oviposition period increased. Female longevity exceeded that of males at all photoperiods, and both males and females at 0:24 (L:D) h had the shortest longevity. The number of eggs laid per female increased with increasing food consumption. Females at 8:16 (L:D) h had the greatest food consumption and laid the most eggs, while females at 24:0 (L:D) h had the lowest food consumption and laid few eggs. The food intake of adults increased gradually and decreased slowly after reaching a peak. Females began to lay eggs when their food consumption reached a maximum. These results indicate that a scotophase is necessary for the reproduction of H. oblita. A long scotophase promotes greater oviposition. The effect of photoperiod on reproduction is affected by food intake.
暗黑鳃金龟（Holotrichia oblita）（鞘翅目：金龟科）是一种主要的土壤昆虫害虫，会损害森林树木、农作物和草坪。暗黑鳃金龟成虫在夜间飞行、觅食和交配，但白天仍在地下活动。我们研究了光周期对暗黑鳃金龟繁殖的影响。与其他光周期相比，8:16（L:D）h 和 0:24（L:D）h 的光照周期下，暗黑鳃金龟雌虫产卵更多。随着暗期的增加，预产卵期减少，产卵期增加。在所有光周期下，雌虫的寿命均长于雄虫，而在 0:24（L:D）h 时，雌雄虫的寿命均最短。每个雌虫产卵数随食物消耗量的增加而增加。8:16（L:D）h 的雌虫食物消耗量最大，产卵最多，而 24:0（L:D）h 的雌虫食物消耗量最低，产卵最少。成虫的食物摄入量逐渐增加，达到峰值后缓慢减少。当雌虫的食物摄入量达到最大值时，它们开始产卵。这些结果表明，暗期对暗黑鳃金龟的繁殖是必要的。较长的暗期可促进更多的产卵。光周期对繁殖的影响受食物摄入量的影响。
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