根是植物的吸收器官,用根外追肥也可以使叶片吸收养分,树皮有没有吸收功能呢?最近在防治虫害的过程中得到了新的启发。一、树皮能吸收农药除虫近几年来板栗树上的红蜘蛛为害猖獗,面对着满山遍野高大的板栗树,打药非常困难,同时打农药常使天敌同归于尽,使红蜘蛛越来越严重。在去年小试验的基础上,今年5月中旬到6月中旬,红蜘蛛大量发生之前,在北京郊区密云县大量试用乐果乳剂涂干。方法是将板栗树干的老皮剥去一圈,宽度约为15厘米,露出白色嫩皮,即刮去木栓层(周皮),露出次生韧皮 Root is the plant’s absorption organs, top dressing with the roots can also make the leaves absorb nutrients, the bark has no absorption function? Recently in the pest control process has been a new inspiration. First, the bark can absorb pest insects In recent years chestnut tree spiders rampant rampant, in the face of tall chestnut trees everywhere, fight drugs is very difficult, while playing pesticides often make natural enemies come to an end, the spider mites more and more serious. On the basis of last year’s small trial, mid-May to mid-June of this year, a large number of red spider mites in Miyun County, Beijing before the trial a large number of dimethoate emulsion coated. The method is to strip the chestnut trunk of the old skin, a width of about 15 cm, exposing white nubuck, that scraping off the cork layer (peritumoral), revealing secondary phloem