2 . during growing season , spray germicide every 7 - 10 days , 3 or 4 times of spray is enough . address no . 904 , zhaolou , heze city , shandong province , china 2生长季节的化学防治中：发病后喷50 %多菌灵1000倍液，或65代森锌500600倍液， 7天10天喷1次，连续喷3次4次。
The technique system of integration dodder management on alfalfa including plant quarantine , agricultural and biological prevention and chemical and biological control are put forward 并系统的提出了植物检疫、农业防治、物理防治、化学防治和生物防治等较为有效的菟丝子综合治理技术体系。
One of the common protecting method is chemical medicine . although it has some effect , it also brings some disadvantages , such as heavy polluted environment , maladjustment ecology and harm to human healthy 目前采用最多的化学防治取得了一定功效，但带来了严重的环境污染、生态失调和危害人类健康等弊端。
The resistance of cotton bollworm to pesticide brings great economic loss to cotton planting . the exploitage of transgenic bt cotton makes it possible to cotton bollworm 80年代以来，棉铃虫( helicoverpaarmigerahubner )抗药性的激增导致化学防治失败，给世界各产棉国造成重大损失，棉铃虫成为棉花生产的严重制约因素。
During growing season , spray the plants with liquid of bordeaux mixture every 10 - 15 days , 2 or 3 times is enough . 3 . do not buy tree peonies with disease , do not plant tree peonies too close , soil must has good drainage ability , 2生长季节化学防治：生长季节一旦发病可采用下列药剂进行喷雾防治： 1 %石灰等量式波尔多液， 70 %甲基托布津1000倍液， 65 %代森锌500倍液，或50 %氯硝胺1000倍液。
So far the chemical controls are still the major measures taken in locust abatement programs in china . in spite of the effectiveness and convenience , the frequent use of insecticides both in quantity and variety has caused a series of problems like locust resistance development , increased control difficulty and rising cost 我国目前控制蝗虫危害的手段主要是采用化学药剂来降低虫口密度，化学防治虽然具有快速、高效、使用灵活等优点，但是随着农药品种及数量的增加和无限制地使用农药，会导致引起蝗虫的抗药性、农药的效能降低、农药生产成本增加等一系列问题。
It use natural or synthesized chemicals ( effective , low toxicity and environment friendly ) of different formulations ( powder concentrate , emulsiflable concentrate , suspension concentrate and granule concentrate , etc . ) to poison or drive away pests by different means ( stomach toxicity , touching out and in - hale , etc . ) 化学防治是指使用天然或合成的药物（高效、低毒、环保） ，以不同的剂型（粉剂、乳剂、水悬剂、颗粒剂等） ，通过不同途径（胃毒、触杀、内吸等）毒杀或驱赶害虫，使害虫因接触或吞食药剂而中毒死亡，或者因此而产生忌避作用而不能侵入危害。
Meanwhile , overall prevention and control measures ( environment conditions , geological location , etc . ) should be adopted based on practical conditions ( environment harnessing , ecological prevention and control , physical prevention and control , and chemical prevention and control , etc . ) and insect ecology to keep the harm of pests at acceptable level 同时结合实际情况（环境条件、地理位置等） ，以昆虫生态学为基础，将有害昆虫采用综合防治措施（环境治理、生态防治、物理防治、化学防治等一切有效手段）控制于不足造成危害水平。
