推荐回答（2个）
山楂果树的秋季、冬初易遭白粉病、蚜虫、球坚介壳虫、鳞翅目幼虫危害。因此7月以后喷一次防虫治病药剂，结合叶面肥，促花等。落叶休眠期彻底喷一遍广谱杀菌剂，彻底清除越冬病虫源。
在做好病虫防治的同时，干旱要适当灌水，并叶面喷水，可防止叶片病毒感染，使枝叶翠绿茂盛、光合作用产物积累和定向转运能力增强，防止叶片过早脱落，影响明年正常挂果和品质的提高。
山楂较耐旱，如未结果以偏干为宜。如结果了就要保证水分的充足供应，以湿润为好，但不宜积水。秋天要控制浇水量，而冬季则宁干勿湿。
扩展资料
山楂树种植的注意事项
1、在夏季山楂抽生新生的枝条能力很强，每个树枝能分生两到三个侧生枝条，树木顶端的外围树枝按照这个规律不断繁殖，造成树冠周围过于葱郁，透光度越来越差。
2、冬季树枝外围很容易进行分枝，树冠外面自然形成闭锁，造成内部的未生长成的枝条生命力减弱，枝条枯死数量也越来越多，秃枝也就越来越多。
3、山楂树虽然生命力很强，但依然会遭受病虫害的袭击。红蜘蛛、桃蛀螟和轮纹病都是山楂树发生的典型的病虫害。要注意防范。
参考资料来源：百度百科-山楂树
参考资料来源：百度百科-植物害虫
在冬季休眠期和春季发芽前分别喷一次“护树将军”+5波美度石硫合剂，保护花芽，消毒灭菌，保温防冻。在5月上旬至6月上旬，喷洒灭扫利2500倍液，防治红蜘蛛和桃蛀螟。在6月中旬、7月下旬、8月上旬各喷1次“新高脂膜”+杀虫剂+杀菌剂，防治桃小食心虫、轮纹病等。对白粉病发病较重的山楂园，在发芽前喷1次，花蕾期、6月各喷1次50%多菌灵可湿性粉剂600倍液成50%甲基托布津可湿性粉剂。
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