红蜘蛛是柑桔树的主要害螨。在秋冬季节,碰上长期干旱,气温下降,虫口即突增,危害猖厥。许多果农为了防治红蜘蛛,在采果后即急着喷药。由于根系吸水能力与叶片蒸腾失去平衡,原来载果较多的柑桔树叶片发生萎蔫,此时喷药叶柄容易产生离层;加之目前果农使用防治红蜘蛛的主要药剂,是可降低叶片干物质产生的石硫合剂、克螨特等农药,这就更进一步削弱了树势,引起叶片脱落。实践证明,严重脱叶的柑桔树,树势弱,翌年大幅减产,甚至失收。 Red spider is the main pest mite citrus trees. In the autumn and winter, run into long-term drought, the temperature drops, the insect population that sudden surge, hazards are rampant. Many fruit farmers in order to control spider mites, rush in the spray after the fruit picking. As the root water absorption capacity and leaf evapotranspiration out of balance, the original citrus fruit leaf bearing more fruit wilting, spraying petiole prone to delamination; combined with the current fruit farmers to use the main drug to control spider mites, is to reduce leaf dry matter Produced by the lime sulfur mixture, mites and other pesticides, which further weakened the tree potential, causing the leaves off. Practice has proved that severely defoliated citrus trees, trees vulnerable, a substantial cut the following year, or even lost.