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猿葉蟲有大猿葉蟲和小猿葉蟲兩種,多混合發(fā)生,主要危害十字花科中薄葉型的蔬菜,以秋季在油菜、蘿卜、白菜、芥菜上危害最重,還可危害甘藍(lán)、花椰菜、黃花菜等。猿葉蟲的成蟲和幼蟲均危害蔬菜的葉片。初孵幼蟲僅食葉肉,造成小凹斑痕。成蟲和大齡幼蟲把葉片
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Total yields of vine tip of seven varieties of Leaf-vegetable sweetpotato during 2006-2007 were investigated; proportions of the weights of leaf, leaf stalk and stem in total vine tip yield and their changes among varieties and during topping stages were studied. The results showed that vine tip yields of sweetpotato were significantly different among either varieties or topping stages; leaf yield accounted for about 51% of total vine yield, and changes in leaf yield among topping stages were higher than that among varieties; while yields of leaf stalk and stem each accounted for 25% of total vine tip yield, their changes among varieties were higher than those among topping stages. These results revealed the yield composition of vine tip of Leaf-vegetable sweetpotato, which provided scientific references for breeding and cultivating new Leaf-vegetable sweetpotato variety and its industrialization.
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