论文部分内容阅读
1986—1987年,用制作玻片标本和记录叶片上螨量的方法观察新乡棉区棉花叶螨优势种的消长。结果表明:一、新乡地区棉花叶螨为朱砂叶螨Tetranychus cinnabarinus和截形叶螨T.truncatus构成的复合种群。二、不同年份及同一年份不同时期优势种有变化。1986年朱砂叶螨是优势种,1987年棉花生长初期,朱砂叶螨为优势种,6月中旬后,该螨所占比例开始下降,7月上旬后,截形叶螨成为优势种,并维持优势到危害后期。
From 1986 to 1987, the growth and decline of dominant species of cotton spider mite in Xinxiang cotton area were observed by making slides and recording the amount of mites on leaves. The results showed as follows: (1) The cotton spider mites in Xinxiang were Tetranychus cinnabarinus and T.truncatus. Second, in different years and in the same year, the dominant species changed in different periods. In 1986, Tetranychus cinnabarinus was the dominant species. In the early stage of cotton growth in 1987, Tetranychus cinnabarinus was the dominant species. After the middle of June, the proportion of Tetranychus urticae began to decline. In early July, Tetranychus urophylla became the dominant species and maintained Advantages to endanger the late.