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从秋季落叶后到早春发芽前,为梨树的休眠期,这一时期病虫越冬场所比较集中,龄期一致,冬眠时间长,活动能力弱。此期加强防治,省工、省药、效果好,对减轻梨园全年的病虫危害,能起到事半功倍的作用。 1、清园 许多病菌如梨黑星病、褐斑病、轮纹病病菌和某些害虫如梨木虱、梨冠网蝽、黄粉虫等,都在树下的枯枝落叶或杂草中越冬。因此,在梨树落叶后应及时清扫落叶,埋于树下作肥料或集中烧毁,以消灭越冬病虫源。 2、耕翻 在结冻前或早春解冻后,翻松土壤,破坏害虫的越冬场所,将越冬虫翻出地表风干而死或被鸟类啄食,以减少桃小食心虫、梨实蜂及舟形毛虫等害虫的越冬虫源。 3、刮树皮 在梨树的翘皮裂缝中潜藏有多种
From the autumn leaves to early spring before germination, pear dormant period, during this period pests and parasites wintering places are more concentrated, consistent age, hibernation for a long time, activity is weak. This period to strengthen prevention and control, labor, medicine, good effect, to reduce the pear orchard pests and diseases throughout the year, can play a multiplier effect. 1, many of the Park Qingyuan bacteria such as pear scab, brown spot disease, rotten pathogen and some pests such as pear lice, pear crown net bug, Tenebrio, etc., are in the tree litter or weeds in the winter . Therefore, pear leaves should be promptly cleaned deciduous trees, buried under the tree for fertilizer or concentrated burned to eliminate overwintering source of pests and diseases. 2, plowed before freezing or early spring thaw, loosen the soil, destroy the pests of the overwintering place, the overwintering insect turned out of the surface air-dried or pecked by birds, in order to reduce peach moth worms, pears pear and boat Caterpillars and other pests overwintering insect source. 3, scraping the bark Pear in the cracks in the hide a variety of hidden