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麦田蚜虫不论在一般年份还是大发生年份,不论在施药前或施药后,其天敌的数值反应均为指数类型,即Y=A·EXP(BX)。用Solomen回归系数法计算回归系数表明,该数值反应为反密度制约关系或与密度无关。虽然天敌对蚜虫种群数量的增长有一定的抑制作用,但是在蚜虫影响小麦产量的关键期,若蚜虫数量在防治标准之上,仍需采用化学防治的方法。上述反应与经典数值反应不同,属于节肢动物与作物种类引起的特殊反应类型。
The aphids in wheat field showed the exponential type of natural enemies both in the general year and in the year of occurrence, ie, Y = A · EXP (BX) before or after spraying. Solven regression coefficients calculated regression coefficients show that the value of the reaction for the inverse density control relationship or has nothing to do with the density. Although natural enemies may have a certain inhibitory effect on the population growth of aphids, in the crucial period when the aphids affect the wheat yield, if the quantity of aphids is above the prevention and control standard, the chemical control methods still need to be adopted. The above reaction is different from the classical numerical reaction and belongs to the special reaction type caused by arthropods and crop types.