He used aphid fecundity data to elucidate the theoretical effects of antibiosis on insect population dynamics . 他利用蚜虫繁殖力资料说明了抗生作用对虫口动态的理论效应。
2.
Studies on the distribution of hylobitelus xiao zhang in the forest of pinus elliottii 萧氏松茎象在湿地松林中的虫口分布研究
3.
Want to have consideration to findings , circumstance of fall victim of density of the mouth that be like bug , crop ( index of be murdered rate , be murdered , loss late ) , computation of result of test of field drug effect 对调查结果要进行计算，如虫口密度、作物受害情况（被害率、被害指数、损失率） 、田间药效试验结果计算等。
4.
So far the chemical controls are still the major measures taken in locust abatement programs in china . in spite of the effectiveness and convenience , the frequent use of insecticides both in quantity and variety has caused a series of problems like locust resistance development , increased control difficulty and rising cost 我国目前控制蝗虫危害的手段主要是采用化学药剂来降低虫口密度，化学防治虽然具有快速、高效、使用灵活等优点，但是随着农药品种及数量的增加和无限制地使用农药，会导致引起蝗虫的抗药性、农药的效能降低、农药生产成本增加等一系列问题。
5.
According to basic principle and application experience of black light lamp , the trapping lamps were opened out using the principle of wave , color and taste to trap insect pests imago with the electric networks of frequently vibration and high voltages , it can trap many species and amounts of insect pests , reduce amounts of field ovum , greatly reduce insect pests density , save energy , have low lost , little harm to natural enemy and persons and livestock , have remarkable economic , ecological and social efficiency 摘要借鉴黑光灯的基本原理和应用经验，再配以频振高压电网触杀的频振式杀虫灯，诱集的害虫种类多、数量大，既大幅度降低了田间落卵量，又显著减少了虫口密度；节能省电，成本低；叶昆虫天敌杀伤力较小，对人畜安全，不污染环境，具有显著的经济、生态和社会效益。
6.
The infested area and spatial variation regularity of dendrolimus punctatus population density at all the survey spots in xianju county were studied with forecast kriging based on the data of survey for dendrolimus punctatus between september 1983 and september 1989 and the spatial forecast model of the infested area and population density of the pest was established 摘要根据1983年9月至1989年9月马尾松毛虫的虫情调查资料，用预测克立格方法研究全县各调查点的马尾松毛虫有虫面积、虫口密度的时空变化规律，建立马尾松毛虫有虫面积、虫口密度的空间预报模型。
