柑桔锈壁虱phyllocoptruta oleivorus(Ashm.)以若螨和成螨寄生于柑桔果实和叶片上,受害叶容易脱落,果上则形成不同程度的锈斑。严重影响柑桔产量、品质和销售等级。据观察、9月中旬至10月中旬果实正处于快速彭大期,螨的为害对果实生长的抑制作用最明显,锈果直经比正常果显著缩小。采果期测得受害果重(y)与锈斑面积占果面百分数(x)的关系为: y=-0.5150x+133.9826 (r=-0.6680~(***) 若按市场规定,被害果面的锈斑率在5%以上由甲级果降为丙级果,价格由0.25元 Citrus rust ticks phyllocoptruta oleivorus (Ashm.) If nymphs and mites parasitic on citrus fruits and leaves, the victim leaves easily fall off, the fruit is the formation of varying degrees of rust. Seriously affect the citrus yield, quality and sales level. It is observed that from mid-September to mid-October the fruit is in the rapid Peng large period, the damage of mite damage on the growth of the fruit most obvious, rust fruit straight through significantly reduced. The relationship between the fruit weight (y) and the percentage of fruit surface area (x) measured during the harvesting period was y = -0.5150x + 133.9826 (r = -0.6680 ~ (***) Surface rust rate of more than 5% from Grade A to Grade C fruit, the price from 0.25 yuan