Colaphellus bowringi
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Colaphellus bowringi Baly - (cabbage leaf beetle)
This beetle is a pest of crucifers in China. The adults and larvae eat the leaves of crops like Brassica's or radish. There is a large variation in the life cycle depending on the location and on environmental conditions. The adults undergo 2 resting periods in the soil, a hibernation period in the winter and a diapause in the summer. Adults, emerging from the soil in spring usually re-enter the soil for the summer diapause after feeding and egg laying. They re-emerge in autum and there is normally one or more additional generations. Both, the duration of the resting periods, as well a the number and duration of the generations per year (up to 4) varies, depending on the environmental condition and the geographical location.
