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二斑叶螨是为害苹果的重要害螨。为经济有效地控制其为害,通过田间调查二斑叶螨种群动态,利用螨日(MD)和苹果的产量损失率建模,研究了苹果树上二斑叶螨的经济为害水平(EIL)。结果显示,苹果的产量损失率与二斑叶螨的螨日具有显著相关性,并据此建立了螨日与产量损失率的回归方程:Q=0.0157+0.00016 MD,R2=0.9567。在经济允许损失率为4.57%时,若以虫口密度作为经济允许为害水平的评价方法,则7月3日之前的EIL≤7.70头/叶,7月25日之前的EIL≤8.70头/叶;当以累计螨日评价时,7月3日之前累计螨日≤29.93,7月25日之前累计螨日≤122.95,在整个生长季的累计螨日需低于188.70。
Two-spotted spider mite is an important pest damage to apple. In order to control its damage economically and effectively, the economic damage level (EIL) of two-spotted spider mites on apple trees was studied by field investigation of the population dynamics of two-spotted spider mites, using the mites yield (MD) and apple yield loss model. The results showed that there was a significant correlation between the yield loss rate of apple and the mite day of Tetranychus urticae and the regression equation of mite days and yield loss was established: Q = 0.0157 + 0.00016 MD, R2 = 0.9567. When the economic allowable loss rate is 4.57%, if the insect population density is taken as the evaluation method of economic allowable damage level, EIL≤7.70 head / leaf before July 3, EIL≤8.70 head / leaf before July 25; When evaluated on the cumulative mite day, cumulative mites day ≤ 29.93 before July 3, cumulative days of mite day ≤122.95 before July 25, and cumulative acaroid day less than 188.70 throughout the growing season.