一、怎么噴農藥殺蟲劑效果更好
在給農作物噴(pen)灑(sa)農藥殺蟲劑的時候,主要注意兩個方面,效果(guo)會(hui)更好:
1、根據氣候特點和害蟲的晝夜活動規律,選擇在有利的時間施藥
施用農藥(yao)殺(sha)蟲(chong)(chong)劑的時(shi)(shi)(shi)間以上午9時(shi)(shi)(shi)--10時(shi)(shi)(shi)和(he)(he)下(xia)午4時(shi)(shi)(shi)以后為宜。因(yin)為上午9時(shi)(shi)(shi)以后,作物葉片上露(lu)水已干,又正是日(ri)出(chu)性害蟲(chong)(chong)活(huo)(huo)動最盛的時(shi)(shi)(shi)候(hou)。在這(zhe)個時(shi)(shi)(shi)候(hou)施藥(yao),既(ji)不(bu)會因(yin)為露(lu)水沖淡(dan)藥(yao)液(ye)(ye)影響防治效果,又可(ke)使害蟲(chong)(chong)與農藥(yao)直接接觸,增加害蟲(chong)(chong)中(zhong)毒(du)機會。下(xia)午4時(shi)(shi)(shi)以后,太(tai)陽偏西(xi),光照減弱(ruo),溫(wen)度降低,而且(qie)正是黃昏(hun)時(shi)(shi)(shi)飛(fei)翔活(huo)(huo)動和(he)(he)夜(ye)出(chu)性害蟲(chong)(chong)即將(jiang)出(chu)動的時(shi)(shi)(shi)候(hou),在這(zhe)個時(shi)(shi)(shi)間施藥(yao),能提(ti)前(qian)將(jiang)藥(yao)劑施于(yu)作物上,待害蟲(chong)(chong)在黃昏(hun)和(he)(he)夜(ye)間出(chu)來活(huo)(huo)動或(huo)取(qu)食時(shi)(shi)(shi)使其接觸毒(du)液(ye)(ye)或(huo)取(qu)食中(zhong)毒(du)死(si)亡,同時(shi)(shi)(shi)還(huan)可(ke)避免(mian)藥(yao)液(ye)(ye)蒸發(fa)損失(shi)和(he)(he)光解失(shi)效。
2、要根據害蟲的危害部位,選用不同的藥劑和采取不同的施藥方法,送藥到位
如對(dui)(dui)危害(hai)根部(bu)的(de)(de)害(hai)蟲(chong)(chong)(chong)(chong),就(jiu)(jiu)將(jiang)藥(yao)(yao)劑灌施于根部(bu)或(huo)施于播種溝(gou)內(nei);對(dui)(dui)在(zai)葉(xie)背面(mian)取食(shi)的(de)(de)害(hai)蟲(chong)(chong)(chong)(chong)就(jiu)(jiu)將(jiang)藥(yao)(yao)液(ye)噴(pen)在(zai)葉(xie)片的(de)(de)反面(mian);防(fang)治(zhi)紅鈴蟲(chong)(chong)(chong)(chong)、棉鈴蟲(chong)(chong)(chong)(chong)就(jiu)(jiu)把(ba)藥(yao)(yao)打到花蕾、青鈴上(shang)及(ji)群尖(jian)上(shang);防(fang)治(zhi)螟蟲(chong)(chong)(chong)(chong)造成(cheng)枯心(xin)苗(miao)就(jiu)(jiu)撒毒土;防(fang)治(zhi)白穗(sui)就(jiu)(jiu)噴(pen)霧或(huo)潑澆(jiao);防(fang)治(zhi)稻飛虱、稻葉(xie)蟬(chan)(chan)就(jiu)(jiu)將(jiang)藥(yao)(yao)液(ye)噴(pen)施到稻株基部(bu);防(fang)治(zhi)斜(xie)紋(wen)夜蛾就(jiu)(jiu)將(jiang)藥(yao)(yao)液(ye)噴(pen)到花蕾及(ji)幼莢上(shang)。此外,對(dui)(dui)棉蚜、紅蜘蛛(zhu)、稻飛虱、稻葉(xie)蟬(chan)(chan)等(deng)隱蔽(bi)性害(hai)蟲(chong)(chong)(chong)(chong),根據(ju)其刺(ci)吸(xi)式口(kou)器取食(shi)方式,可選用內(nei)吸(xi)性強的(de)(de)殺(sha)(sha)蟲(chong)(chong)(chong)(chong)劑吸(xi)收后(hou)傳到植株的(de)(de)其他部(bu)位,達到送(song)藥(yao)(yao)到位的(de)(de)目(mu)的(de)(de)。只(zhi)有因(yin)蟲(chong)(chong)(chong)(chong)施藥(yao)(yao),送(song)藥(yao)(yao)到位,才能抓住弱點,擊中(zhong)要害(hai),實現(xian)藥(yao)(yao)到蟲(chong)(chong)(chong)(chong)除(chu)的(de)(de)功(gong)效(xiao),使(shi)藥(yao)(yao)劑發揮出(chu)最好的(de)(de)作用,獲(huo)得(de)理想的(de)(de)殺(sha)(sha)蟲(chong)(chong)(chong)(chong)效(xiao)果。
二、農業殺蟲劑噴完多久可以澆水
農藥殺蟲劑的噴灑需要等待一段時間讓它發揮作用,如果噴完立馬就澆水或者下雨的話,會導致殺蟲劑失效,那么農藥殺蟲劑噴完(wan)多久可(ke)以澆(jiao)水呢?
一般來說,不(bu)(bu)同(tong)種類的農藥(yao)(yao)殺蟲(chong)劑見效(xiao)時(shi)(shi)(shi)間不(bu)(bu)同(tong),普通的農藥(yao)(yao)殺蟲(chong)劑需(xu)要5~6個小(xiao)(xiao)時(shi)(shi)(shi),才(cai)能發(fa)揮作用,好的可能3~4個小(xiao)(xiao)時(shi)(shi)(shi)就夠了,正常情況(kuang)下,打(da)完4個小(xiao)(xiao)時(shi)(shi)(shi)后(hou),基本藥(yao)(yao)效(xiao)和作用已經達到了,這時(shi)(shi)(shi)候澆水(shui)沒什么太大的影響,不(bu)(bu)過(guo)為了讓藥(yao)(yao)效(xiao)更好發(fa)揮,建議(yi)等十二個小(xiao)(xiao)時(shi)(shi)(shi)后(hou)再澆水(shui),為了防(fang)止(zhi)農作物缺(que)水(shui),可以(yi)在噴農藥(yao)(yao)殺蟲(chong)劑之(zhi)前先澆一次(ci)水(shui)。