霜降后,气温逐渐下降,苹果树进入落叶收浆休眠期,果树体内树液停止流动,树皮厚粗、枝干光秃,清园、修剪、改土等田间管理操作易进行,并且果树此时期对农药敏感性低,不易产生药害,施药时可适当提高药液浓度。同时,果树病虫在冬季处于越冬状态,活动性弱,不扩散转移,常栖息于越冬? Frost down, the temperature gradually decreased, the apple tree into the deciduous harvest period dormancy, fruit tree body fluid flow stops, thick bark, branches bare, clear garden, pruning, soil modification and other field management operations easy to carry out, Period of low sensitivity to pesticides, not easy to produce phytotoxicity, drug application may be appropriate to increase the concentration of liquid. At the same time, pests of fruit trees are in the wintering state in winter, with weak activity, non-proliferation and metastasis, and often habitat in winter.