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本文报道了不同幼虫密度下（１、１０、２０、３０、４０头／瓶－８５０ｍｌ）粘虫蛾飞行能力与产卵量的变化情况。对未取食１日龄成虫１２ｈ飞行能力的测定结果表明，不同幼虫密度羽化的成虫飞行力差异显著（Ｐ＜０．０５），其中以１０头／瓶羽化的成虫飞行时间最长（平均２２５．４分），飞行距离最远（平均１７．５ｋｍ），飞行超过１２０ｍｉｎ的个体为６１．１％，超过１０ｋｍ的为５５％。其它处理的各项参数随幼虫密度的增加而下降。粘虫蛾的翅长、翅宽、翅面积和翅负荷随幼虫密度的增加而下降。除翅负荷外。其余各项参数在处理间的差异显著（ｐ＜０．０５）。成虫飞行能力与蛹重或翅负荷不呈直线相关，但与蛹重具有一定的关系：当蛹重为３００－４００ｍｇ时，强飞行个体均超过５０％，当小于３００ｍｇ或大于４００ｍｇ时，强飞行个体比例下降，当小于２２５ｍｇ时，强飞行个体为零。处理间的成虫产卵量差异显著（ｐ＜０．０５），且随幼虫密度的增加而下降。密度内的蛹重与成虫产卵量的关系不明显，但密度间的蛹重与产卵量的关系高度相关（ｒ＝０．７８，Ｐ＜０．０１）。这些结果表明，当粘虫幼虫密度达到一定的阈值时，便可能促使成虫迁飞，而不是等到种群密度很高时才进行迁飞
In this paper, the variation of flight ability and fecundity of armyworm, Mythimna separatea under different larval densities (1, 10, 20, 30, 40 heads / The results of the 12-h flying ability test showed that there was a significant difference (P <0.05) in the flight force of adults with different larval eclosion, and the longest flight time (average 225 .4 points), farthest distance (17.5 km on average), 61.1% for individuals over 120 min and 55% over 10 km. The parameters of other treatments decreased with the increase of larval density. The length, wing width, wing area and wing load of the armyworm moth decreased with the increase of larval density. In addition to wing load. The remaining parameters in the treatment of significant differences (p <0.05). The flying ability of adult was not linearly correlated with pupa weight or wing load, but had a certain relationship with pupa weight. When pupa weight was 300-400mg, all the flying individuals were more than 50%, and when less than 300mg or more than 400mg, The proportion of individuals decreased, when less than 225mg, strong flight individuals to zero. There was significant difference (p <0.05) in fecundity between the treatments, and decreased with the increase of larval density. There was no significant relationship between the pupal weight within the density and the fecundity of adults, but the relationship between density and fecundity was highly correlated (r = 0.78, P <0.01). These results indicate that when the density of the armyworm larvae reaches a certain threshold, they may promote the migration of adults instead of waiting until the population density is high