Su Jun, Zhang Fei-Ping, Huang Wen-Ling, Chen De-Lan, Chen Shun-Li
College of Forest, Fujian Agricultural and Forest University, Fuzhou, China.
Forestry Bureau of Sanming, Fujian Province, China.
J Insect Sci. 2015 Apr 5;15(1). doi: 10.1093/jisesa/iev008. Print 2015.
We found that Pantana phyllostachysae, a dangerous pest of moso bamboo (Phyllostachys pubescens), showed differences in growth and development after feeding on diverse types of moso bamboo leaves. The mortality rate of Pa. phyllostachysae due to Beauveria bassiana, an entomopathogenic fungus, was also affected by the varied larval diet. Larval and pupal developmental duration of Pa. phyllostachysae was longer when feeding on "off-year" bamboo leaves. Pupal weight and adult fertility were higher when feeding on "on-year" bamboo leaves. Mortality due to B. bassiana was significantly lower in larvae fed on on-year bamboo leaves than in larvae fed on off-year bamboo leaves. Larvae fed on new bamboo leaves had a shorter development period and higher survival rate than those fed on off-year bamboo leaves. However, mixed feed (mixture of new, on-year, and off-year bamboo leaves) decreased the egg production of Pa. phyllostachysae. After infection by the second generation of B. bassiana, the survival time of Pa. phyllostachysae fed on mixed feed increased significantly compared with the first generation. We also fed Pa. phyllostachysae different proportion of new bamboo leaves in mixed feed to simulate natural conditions. We found that increasing the proportion of new bamboo leaves in the food promoted pupal development and increased egg production; it also increased the resistance of larvae to the first generation of B. bassiana. The pathogenicity of the second generation of B. bassiana declined in all mixed feed treatments.
我们发现，毛竹（Phyllostachys pubescens）的一种危险性害虫——竹织叶野螟（Pantana phyllostachysae）在取食不同类型的毛竹叶后，其生长发育表现出差异。球孢白僵菌（Beauveria bassiana）这种昆虫病原真菌对竹织叶野螟的致死率也受到幼虫不同食料的影响。竹织叶野螟幼虫和蛹的发育历期在取食“小年”竹叶时较长。取食“大年”竹叶时，蛹重和成虫繁殖力较高。球孢白僵菌导致的死亡率在取食大年竹叶的幼虫中显著低于取食小年竹叶的幼虫。取食新竹叶的幼虫比取食小年竹叶的幼虫发育历期短且存活率高。然而，混合饲料（新叶、大年叶和小年叶的混合物）降低了竹织叶野螟的产卵量。在受到第二代球孢白僵菌感染后，取食混合饲料的竹织叶野螟存活时间相比第一代显著增加。我们还在混合饲料中给竹织叶野螟投喂不同比例的新竹叶以模拟自然条件。我们发现，提高饲料中新竹叶的比例促进了蛹的发育并增加了产卵量；这也增强了幼虫对第一代球孢白僵菌的抗性。在所有混合饲料处理中，第二代球孢白僵菌的致病性均有所下降。
