Diadegma insulare (Cresson) is the most efficient parasitoid of Plutella xylostella (L.) in cruciferous crops. Considering its effectiveness, the present study was performed to investigate the impacts of cauliflower and cabbage cultivars under 3 different temperature regimes on the parasitism efficiency and offspring sex ratio of D. insulare. This study revealed that D. insulare remained active at all the 3 temperatures (i.e., 19, 23, and 27 °C) and on all selected cruciferous cultivars. However, 23 °C (along with 65±5% RH and 16L: 8D hours) was the most suitable temperature, whereas relatively preferred host plant cultivars were the “White marble” (cauliflower) and “Asha” (cabbage) at which comparatively higher parasitism rates (79.39 and 73.31%, respectively) were recorded. Moreover, non-significant differences were observed in the offspring sex ratios of the parasitoid at different temperature regimes; however, minute differences were found among studied cruciferous cultivars. Overall, “White marble” (cauliflower) and “Asha” (cabbage) were recommended to be used as potential host plant cultivars for mass rearing of D. insulare.

中文翻译：

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不同温度下十字花科小菜蛾（Cresson）（膜翅目：翅目科）与小菜蛾（Linnaeus）（鳞翅目：tell科）的寄生关系和性别比

斜纹夜蛾（Diadegma insulare）（Cresson）是十字花科作物中小菜蛾（Plutella xylostella）的最有效寄生虫。考虑到其有效性，本研究旨在研究菜花和甘蓝品种在3种不同温度下对盾叶石D寄生效率和后代性别比的影响。这项研究表明，在所有3个温度（即19、23和27°C）和所有选定的十字花科品种上，D。insulare都保持活性。但是，最适合的温度是23°C（相对湿度65±5％，16L：8D小时），而相对首选的寄主植物品种是“白色大理石”（花椰菜）和“ Asha”（白菜），相对而言记录到较高的寄生率（分别为79.39和73.31％）。此外，在不同温度下，该寄生虫的后代性别比例无显着差异；然而，在研究的十字花科品种之间发现了微小的差异。总体而言，建议将“白色大理石”（花椰菜）和“ Asha”（白菜）用作潜在的寄主植物，以进行Insulare的大规模繁殖。