一、yaoduizhengxiayao

，youdefangshi。rutuobujinfangzhigualeibaifenbingshigaoxiaonongyao。duishuangmeibingjiushiwuxiaoyao。fangzhikuweibingshixuturangshiyao，ruguozhizaidimianshangpenyaojiubulixiang。

二、要(yao)摸(mo)清(qing)病(bing)蟲(chong)發(fa)生(sheng)規(gui)律(lv)。掌(zhang)握(wo)防(fang)治(zhi)適(shi)期(qi)
，病(bing)蟲(chong)都(dou)有(you)自(zi)己(ji)的(de)發(fa)生(sheng)規(gui)律(lv)，病(bing)蟲(chong)測(ce)報(bao)點(dian)，應(ying)定(ding)期(qi)，定(ding)點(dian)進(jin)行(xing)係(xi)統(tong)調(tiao)查(zha)，及(ji)時(shi)發(fa)現(xian)尋(xun)找(zhao)防(fang)治(zhi)的(de)最(zui)好(hao)時(shi)機(ji)。多(duo)數(shu)病(bing)害(hai)隻(zhi)要(yao)發(fa)現(xian)有(you)病(bing)株(zhu)，就(jiu)應(ying)噴(pen)藥(yao)防(fang)治(zhi)。而(er)蟲(chong)害(hai)不(bu)一(yi)樣(yang)，一(yi)般(ban)在(zai)達(da)到(dao)一(yi)定(ding)的(de)蟲(chong)口(kou)密(mi)度(du)時(shi)才(cai)噴(pen)藥(yao)。如(ru)蚜(ya)蟲(chong)株(zhu)率(lv)達(da)30%，菜青蟲二齡幼蟲達20%時噴藥為防治適期。

三、yaoyangezhangwoyaolianghenongdu。zaipenyaoshiyouderenrenweiyaonongyidian，penyaosudukuaiyidian，xiaoguojiuhuihaoxie。qishiburan，penyaosudukuai，wangwangpenbujunyun
，chuxianjubunongduhengaoershijiyaoliangbuzudexianxiang
，tebieshibujuneixixingnengdeyaoji。tongshisuiyitigaoyongyaonongdu，haihuishibingchongjixingchanshengkangyaoxing。yinci，bixuanzhaoguidingdenongdupeiyao。penyaoshiliqiujunyunzhoudao，yong0.7毫米小孔徑噴片
，可使霧滴細微
，既省藥又可提高防治效果。

四、要yao合he理li用yong藥yao。既ji省sheng人ren力li又you兼jian治zhi病bing蟲chong。如ru將jiang樂le果guo與yu白bai菌jun清qing托tuo布bu津jin混hun合he施shi用yong
，可ke起qi到dao殺sha蟲chong和he滅mie菌jun兩liang種zhong作zuo用yong，並bing可ke延yan緩huan病bing菌jun對dui瑞rui毒du黴mei產chan生sheng抗kang性xing
，一yi舉ju兩liang得de。在zai一yi個ge地di區qu連lian續xu使shi用yong一yi種zhong農nong藥yao，容rong易yi使shi病bing蟲chong產chan生sheng抗kang性xing，造zao成cheng用yong藥yao濃nong度du不bu斷duan提ti高gao，防fang治zhi效xiao果guo卻que越yue來lai越yue低di的de後hou果guo。所suo以yi，最zui好hao是shi多duo種zhong農nong藥yao輪lun換huan使shi用yong。