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1983—1986年在河北省邯郸地区农科所采用自然感虫与人工控制虫量的开放式方法,设不同类型田、不同虫量的处理,研究了棉铃虫的为害作用、虫量与产值损失率的关系、棉株的补偿能力及其主要影响因素。同时研究了棉铃虫的自然种群生命表、虫量、农药的防治次数及防治效果,在此基础上组建了棉铃虫的动态EIL模型: 并综合考虑经济效益、生态效益和防治成本,用模糊综合评判的方法进行两级综合评判得出了高、中、低产田二、三代棉铃虫的经济阈值。经大面积大田示范验证,证明新经济阈值是可行的。
1983-1986 in Handan, Hebei Province, agricultural use of natural insects and artificial control of the amount of pests open method, set up different types of fields, different insects treatment, the study of the damage effects of cotton bollworm, insects and output loss The relationship between the rate of compensation of cotton plant and its main influencing factors. At the same time, the natural population life table, the amount of insects, the control times of pesticides and the control effect of the cotton bollworm were studied. Based on the results, the dynamic EIL model of the cotton bollworm was established: considering the economic benefits, ecological benefits and prevention costs, The two-level comprehensive evaluation of the method of evaluation obtained the economic threshold of the second and third generations of cotton bollworm in high, medium and low yield fields. After a large area demonstration demonstration of the field, it is feasible to prove the new economic threshold.