Harmonia axyridis (Pallas) is an important natural enemy of crop pests. Feeding H. axyridis through artificial diets (ADs) is an important means to achieve large‐scale production. In this study, the effects of different diets on the growth, development and reproduction of H. axyridis were comprehensively evaluated, and the reasons for the reduced reproductive capacity of H. axyridis fed ADs were preliminarily explored. Artificial diets were prepared using pig liver and pork as the main ingredients. Larval duration, larval survival rate, egg production and other traits were comprehensively evaluated. Harmonia axyridis fed ADs during both the larval and adult periods completed growth and development from larva to adult but had a prolonged development duration (6.13‐day extension) and reduced survival rate (15.3% reduction) in the larval stage. In addition, adults could not lay eggs. Next, individuals of H. axyridis were fed Megoura japonica (Matsumura) in the larval stage and an AD, adequate aphids (AA) or an artificial diet plus 5 (AD5), 10 (AD10) or 25 (AD25) aphids in the adult stage. The adults in the AD group produced a small number of eggs (103.3 eggs). When aphids were added to the diet, egg production gradually increased with the number of aphids added. The AD25 group exhibited no significant difference in egg production compared with that in the AA group (983.8 eggs and 1,158.3 eggs, respectively). Anatomical observations of the H. axyridis adults in these five groups revealed that ovary development was slowest in the AD group. In addition, we found that the levels of vitellogenin and juvenile hormone were significantly lower in the AD group than in the AA group. These results provide a foundation for formulating ADs for H. axyridis and improving the large‐scale reproduction of this species.

中文翻译：

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不同日粮对异色瓢虫(Pallas)生长发育的影响

Harmonia axyridis (Pallas) 是农作物病虫害的重要天敌。通过人工饲料 (ADs) 饲喂蝾螈是实现规模化生产的重要手段。本研究综合评价不同日粮对尖吻螟生长、发育和繁殖的影响，初步探讨饲喂ADs后尖吻螟繁殖能力下降的原因。以猪肝和猪肉为主要成分制备人工饲料。对幼虫持续时间、幼虫成活率、产蛋量等性状进行综合评价。在幼虫和成虫时期喂食 ADs 的异色瓢虫完成了从幼虫到成虫的生长发育，但在幼虫阶段发育持续时间延长（6.13 天延长）和存活率降低（减少 15.3%）。此外，成年人不能产卵。接下来，在幼虫阶段用 Megoura japonica (Matsumura) 和 AD、足够的蚜虫 (AA) 或人工饲料加 5 (AD5)、10 (AD10) 或 25 (AD25) 只蚜虫喂养成虫阶段。AD 组的成虫产卵量很少（103.3 个卵）。当饲料中添加蚜虫时，随着蚜虫数量的增加，产蛋量逐渐增加。AD25 组产蛋量与 AA 组相比无显着差异（分别为 983.8 个和 1,158.3 个）。对这五个组中的 H. axyridis 成虫的解剖观察显示，AD 组的卵巢发育最慢。此外，我们发现AD组的卵黄蛋白原和保幼激素水平显着低于AA组。