New pest Strongyllodes variegatus on winter oilseed rape in Anhui Province. (English)

Strongyllodes variegatus (Coleoptera: Nitidulidae, Fairmaire, 1891 ) was first found on oilseed rape in Chaohu area, Anhui Province, China in 2008. The damage it caused on rapeseed had become more serious in recent years. Field surveys and tests showed that S. variegatus mainly distributed in Chaohu, Ma' anshan, Xu-ancheng, Anqing, Liu'an, (part of) Hefei and (part of) Chuzhou in Anhui Province. The pest was observed to reproduce twice a year and occurred in spring (from March to May) and autumn (from September to November) in Anhui Province. But the main plague and reproduction period were from March to May. Adults fed on rape leaves, tender stem, buds and tender pods, which led to crescent wounds on the undersurface of leaves and bare stems. The larvae only eat mesophyll between the surfaces of leaves, forming irregular bubble damage, which led to leaf rot and fall before senescence. The over - summering adults hatched their eggs in soil and fed on leaves during September to November. The elder larvae pupated and emerged in soil. The adults aestivated and hibernated in soil and among rapeseeds. [ABSTRACT FROM AUTHOR]

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