棉铃虫与棉花生长发育耦合系统的建立

以棉铃虫取食模型、种群动态模型及棉花生长发育模型为基础,通过对棉田生态系统中一些关键环节的分析,进一步发展出田间棉铃虫的管理系统。这个系统较好地反映出了国内外到目前为止在棉铃虫管理方面的最新研究成果。强调了在棉花生长发育过程中超补偿机制的实现,以及人工去早蕾与2代棉铃虫取食对棉花生长和产量形成的影响。本系统可以反映第2、3代棉铃虫不同卵量水平下,及不同人工去早蕾水平下棉花生长发育的动态过程。通过不同卵量水平时各去蕾量对产量的影响,以及不同用药时间的最终产量效果的比较,可以找出最佳的去蕾量以及合理的用药时间。

Establishment of a field management system with coupling cotton bollworm (Helitothis armigera) dynamics and cotton plant development.

Based on detailed studies of Heliothis armigera foraging behaviour in cotton field, its population dynamics and simulation model of cotton growth and development, a management system has been established. The latest research achievements in this area are combined in the system. The dynamical effects of the 2nd and 3rd generations of cotton bollworm on the growth and development of cotton plant can be given separately and compositely. As a management system, it can produce suitable schemes of artificially removing squares in different egg levels of the 2nd generation. And, by comparing the final yields of cotton in different spraying tactics, the optimal one can be given. The overcompensation mechanism in cotton plants has been especially emphasized in the system. Field experiments had shown that artificially removing early squares can increase cotton yields, and if without or within a certain extent of the damages of plant growing points, the foraging by cotton bollworm had same effect, but with less degree. The system can differentiate clearly the effect of these two different "stimulations" on cotton growth and final yields.