摘要
棉蚜在每株接种 2 ,4 ,8,16,32头等不同初始密度情况下的种群数量变化进行了实验观察 ,并对有翅蚜的数量动态进行了观察和分析。棉蚜增殖速度有随初始接种密度的增大而显著降低 ,而且随着繁殖时间的增加而加强趋势。在接种 2周后 ,有翅蚜占总蚜量的比例在接种密度为 8头 /株时达到最高 ,之后开始迁飞 ,但到接种 3周后 ,最高比例出现在接种密度为 16头/株 ,说明有翅蚜的产生与迁飞不但受种群密度的影响 。
The population dynamic of the cotton aphids, Aphis gossypii Glover, under varying inoculated densities by 2,4,8,16 and 32 aphids per plant, was observed in the gauze covering cage in June, 1998. The alate population was observed and analyzed. The cotton aphid population increased significantly with the downward inoculated densities and with the time. At the age of two weeks after inoculation, the highest ratio between alate and total aphids occurred under the density of 8 per plant and emigrated thereafter. But at the age of three weeks, the highest ratio switched to the density of 16 per plant. The result showed that the development of alate in the cotton aphid was not only affected by the density of aphids (crowd) but also by other factors.
出处
《新疆农业大学学报》
CAS
2000年第3期42-44,共3页
Journal of Xinjiang Agricultural University
关键词
棉蚜
种内竞争
种群数量
害虫
棉花
Aphis gossypii
intra specific competition
pupolation dtnamic
