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在田间进行农作物昆虫系统调查时,常采用定点定株调查(即定株取样)和定点不定株调查(即非定株取样)两种取样方式,来获得测报所需的第一手资料。至于它们对昆虫数量有何影响,则尚无报道。基于此,笔者于1984—1987年就上述问题进行了初步调查研究。1 材料和方法(1)本项研究以棉田内棉蚜、红铃虫、蓟马类、瓢虫类和蜘蛛类为材料,分别对棉蚜的若虫,红铃虫的卵、蓟马类的成虫、若虫,瓢虫类的成虫,若虫及卵,蜘蛛类的成蛛、若蛛及卵等几种主要的昆虫进行
In the field of crop insects system survey, often using fixed-point surveys (ie, Strain sampling) and sentinel plants survey (ie non-Strain sampling) two sampling methods to obtain the first-hand information required for the report. As for how they affect the number of insects, there is no report yet. Based on this, I conducted a preliminary investigation and study on the above issues in 1984-1987. 1 Materials and methods (1) In this study cotton aphid, red bollworm, thrips, ladybugs and spiders as materials, respectively, aphids nymphs, eggs of pink bollworm, thrips Adults, nymphs, ladybugs, adults, nymphs and eggs, arachnids of spiders, spiders and eggs and several other major insects