一、怎么噴農藥殺蟲劑效果更好
在(zai)給農作物噴灑(sa)農藥殺(sha)蟲劑(ji)的(de)時候,主要注意兩個方面(mian),效果會更好:
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(nong)藥(yao)殺蟲(chong)(chong)(chong)劑(ji)的時(shi)(shi)(shi)間以上(shang)午(wu)9時(shi)(shi)(shi)--10時(shi)(shi)(shi)和(he)(he)下(xia)午(wu)4時(shi)(shi)(shi)以后為(wei)宜(yi)。因(yin)為(wei)上(shang)午(wu)9時(shi)(shi)(shi)以后,作物(wu)葉片上(shang)露水(shui)已干,又(you)正(zheng)是日出(chu)性(xing)害(hai)蟲(chong)(chong)(chong)活(huo)動最(zui)盛的時(shi)(shi)(shi)候。在這個(ge)時(shi)(shi)(shi)候施藥(yao),既不會因(yin)為(wei)露水(shui)沖淡(dan)藥(yao)液(ye)影響防治效果,又(you)可使害(hai)蟲(chong)(chong)(chong)與農(nong)藥(yao)直接接觸(chu),增加(jia)害(hai)蟲(chong)(chong)(chong)中毒(du)機會。下(xia)午(wu)4時(shi)(shi)(shi)以后,太陽偏西,光照減弱,溫度降(jiang)低,而且正(zheng)是黃(huang)昏時(shi)(shi)(shi)飛翔活(huo)動和(he)(he)夜出(chu)性(xing)害(hai)蟲(chong)(chong)(chong)即將(jiang)出(chu)動的時(shi)(shi)(shi)候,在這個(ge)時(shi)(shi)(shi)間施藥(yao),能提前將(jiang)藥(yao)劑(ji)施于(yu)作物(wu)上(shang),待害(hai)蟲(chong)(chong)(chong)在黃(huang)昏和(he)(he)夜間出(chu)來活(huo)動或(huo)取食時(shi)(shi)(shi)使其接觸(chu)毒(du)液(ye)或(huo)取食中毒(du)死(si)亡,同時(shi)(shi)(shi)還可避免(mian)藥(yao)液(ye)蒸發(fa)損(sun)失和(he)(he)光解失效。
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
如對危害(hai)(hai)根(gen)部的(de)(de)(de)害(hai)(hai)蟲(chong)(chong),就(jiu)(jiu)(jiu)將(jiang)藥(yao)(yao)(yao)(yao)劑(ji)灌施(shi)于根(gen)部或(huo)施(shi)于播(bo)種溝內;對在葉背面取食(shi)的(de)(de)(de)害(hai)(hai)蟲(chong)(chong)就(jiu)(jiu)(jiu)將(jiang)藥(yao)(yao)(yao)(yao)液(ye)噴(pen)在葉片的(de)(de)(de)反面;防(fang)(fang)治紅(hong)鈴(ling)(ling)蟲(chong)(chong)、棉(mian)鈴(ling)(ling)蟲(chong)(chong)就(jiu)(jiu)(jiu)把藥(yao)(yao)(yao)(yao)打(da)到(dao)(dao)(dao)花(hua)(hua)蕾、青鈴(ling)(ling)上(shang)及群尖上(shang);防(fang)(fang)治螟蟲(chong)(chong)造(zao)成枯心苗就(jiu)(jiu)(jiu)撒毒土;防(fang)(fang)治白穗(sui)就(jiu)(jiu)(jiu)噴(pen)霧或(huo)潑澆;防(fang)(fang)治稻飛(fei)虱(shi)、稻葉蟬就(jiu)(jiu)(jiu)將(jiang)藥(yao)(yao)(yao)(yao)液(ye)噴(pen)施(shi)到(dao)(dao)(dao)稻株基部;防(fang)(fang)治斜紋夜蛾就(jiu)(jiu)(jiu)將(jiang)藥(yao)(yao)(yao)(yao)液(ye)噴(pen)到(dao)(dao)(dao)花(hua)(hua)蕾及幼莢上(shang)。此(ci)外,對棉(mian)蚜、紅(hong)蜘蛛、稻飛(fei)虱(shi)、稻葉蟬等隱蔽性(xing)害(hai)(hai)蟲(chong)(chong),根(gen)據其刺吸式(shi)口器(qi)取食(shi)方式(shi),可選用內吸性(xing)強的(de)(de)(de)殺蟲(chong)(chong)劑(ji)吸收后傳(chuan)到(dao)(dao)(dao)植(zhi)株的(de)(de)(de)其他部位(wei),達到(dao)(dao)(dao)送藥(yao)(yao)(yao)(yao)到(dao)(dao)(dao)位(wei)的(de)(de)(de)目的(de)(de)(de)。只有因蟲(chong)(chong)施(shi)藥(yao)(yao)(yao)(yao),送藥(yao)(yao)(yao)(yao)到(dao)(dao)(dao)位(wei),才能抓(zhua)住弱點,擊中要(yao)害(hai)(hai),實現藥(yao)(yao)(yao)(yao)到(dao)(dao)(dao)蟲(chong)(chong)除的(de)(de)(de)功效,使藥(yao)(yao)(yao)(yao)劑(ji)發(fa)揮出最好的(de)(de)(de)作用,獲得(de)理想的(de)(de)(de)殺蟲(chong)(chong)效果。
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多久(jiu)可(ke)以澆水呢?
一(yi)般來說,不(bu)(bu)同(tong)種類的(de)農藥(yao)殺(sha)(sha)蟲(chong)劑見效(xiao)(xiao)時(shi)(shi)間不(bu)(bu)同(tong),普通的(de)農藥(yao)殺(sha)(sha)蟲(chong)劑需要(yao)5~6個(ge)(ge)小時(shi)(shi),才能發(fa)揮作用,好的(de)可(ke)能3~4個(ge)(ge)小時(shi)(shi)就(jiu)夠了(le),正常(chang)情況下,打完4個(ge)(ge)小時(shi)(shi)后,基本(ben)藥(yao)效(xiao)(xiao)和作用已經(jing)達到了(le),這時(shi)(shi)候澆(jiao)(jiao)水沒什么太大的(de)影響,不(bu)(bu)過(guo)為了(le)讓藥(yao)效(xiao)(xiao)更好發(fa)揮,建議等(deng)十二個(ge)(ge)小時(shi)(shi)后再澆(jiao)(jiao)水,為了(le)防止農作物缺水,可(ke)以在(zai)噴(pen)農藥(yao)殺(sha)(sha)蟲(chong)劑之前(qian)先澆(jiao)(jiao)一(yi)次(ci)水。