Downy mildew ntawm cucumbers thiab txiv hmab txiv ntoo tuaj yeem ua rau cov neeg laus cov nroj tsuag nyob rau theem yub thiab feem ntau ua rau nplooj thiab stems puas tsuaj, nrog rau kev puas tsuaj tsawg rau tendrils thiab pedicels. Downy mildew muaj qhov cuam tshuam tseem ceeb rau kev loj hlob ntawm cucumbers thiab txiv hmab txiv ntoo, thiab ncaj qha cuam tshuam rau cov qoob loo ntawm cucumbers thiab txiv hmab txiv ntoo. Yog li yuav ua li cas tiv thaiv thiab tswj downy mildew? Niaj hnub no, kuv xav qhia rau koj ib tug tshwj xeeb tshuaj rau kev tiv thaiv thiab kho downy mildew, uas yogdimethomorph.
1. Khoom nta
Dimethomorph feem ntau ua rau cov kab mob hauv peb yam hauv qab no: kev tiv thaiv kev tiv thaiv, uas tuaj yeem tiv thaiv kev loj hlob thiab cuam tshuam ntawm cov kab mob spores. Cov nyhuv kho tuaj yeem nkag mus rau hauv cov ntaub so ntswg thiab tua cov fungal hyphae; cov nyhuv anti-spore tuaj yeem tiv thaiv kev tsim cov kab mob spores thiab txo cov kab mob.
Qhov no tshwj xeeb mechanism ntawm kev txiav txim thiab cov yam ntxwv ntawm ntau yam kev txiav txim theem ua rau dimorpholine muaj kev tswj zoo heev ntawm downy mildew thiab blight.
(1) Cov nyhuv zoo thiab ua haujlwm ntev
Dimethomorph muaj cov txheej txheem tshwj xeeb ntawm kev ua haujlwm, ua haujlwm zoo rau txhua theem kev loj hlob ntawm Oomycete fungi, thiab muaj kev cuam tshuam tshwj xeeb rau ntau yam kab mob mildews thiab kab mob sib kis. Nws muaj ob qho tib si tiv thaiv thiab kho cov teebmeem, nrog rau kev tiv thaiv sporulation.
Lub sijhawm thov ntawm dimethomorph feem ntau yog li ntawm 7-10 hnub, uas yog 3-4 hnub ntev dua li lwm tus neeg sawv cev. Nws muaj cov nyhuv kav ntev, txo cov ntawv thov, thiab txuag lub sijhawm thiab cov nqi.
(2) Yuav tsis tsim tshuaj tiv thaiv
Dimethomorph tsis muaj qhov cuam tshuam nrog lwm cov tshuaj fungicides xws li metalaxyl thiab cymoxanil, thiab yog qhov tsis zoo. Nws tuaj yeem tua cov kab mob sai sai uas tiv taus lwm cov fungicides thiab ua kom muaj txiaj ntsig ruaj khov.
(3) Resistant los nag yaig
Nws yog super dej-soluble thiab dispersible, muaj zog penetrating nyhuv, tuaj yeem nkag mus sai sai ntawm nplooj thiab kis hauv zos, thiab tiv taus los nag yaig. Qhov kev ua tau zoo yuav luag tsis cuam tshuam los ntawm nag los 1 teev tom qab txau.
Txhim kho cov nroj tsuag photosynthesis, ua kom cov txiv hmab txiv ntoo thiab zaub ci dua, thiab ua kom tiav cov qoob loo tawm los thiab zoo.
(4) Kev sib xyaw ua ke zoo
Dimethomorph tuaj yeem sib xyaw nrog pyraclostrobin, azoxystrobin, cymoxanil, mancozeb, propenzeb, mesostrobin, thiram, chlorothalonil, aluminium triethylphosphonate, pyraclostrobin, aminooligosaccharides, prochloraz, metalaxyl, zhongshengmycin, iprodimethylphosphonate, thiab lwm yam.
(5) Kev nyab xeeb zoo
Dimethomorph kuj muaj kev nyab xeeb heev txawm tias siv thaum lub sij hawm flowering thiab fruit expansion theem.
2. Scope ntawm daim ntawv thov
Grapes, lychees, dib, melons, iab melons, txiv lws suav, peppers, qos yaj ywm, zaub cruciferous.
Dimethomorph muaj peev xwm tswj tau zoo ntawm cov kab mob me me, kab mob me me, kab mob lig, blight (mildew), Phytophthora rot, pythium, dub shank thiab lwm yam kab mob uas tsis tshua muaj fungal. Ntawm cov zaub, nws tuaj yeem tiv thaiv thiab tswj dib downy mildew, melon downy mildew, taro blight, kua txob blight, cruciferous zaub downy mildew, thiab lwm yam.
Dimethomorph ntau npaum li cas muaj xws li 25%, 30%, 50% wettable hmoov, 25% microemulsion, 10%, 20%, 40%, 50% suspending agent, 40%, 50%, 80% dej-dispersible granules, 50% effervescent ntsiav tshuaj 10%, 15% dej emulsion. Dimethomorph yog hmoov dawb los yog siv lead ua. Nws yog hydrolytically ruaj khov nyob rau hauv ib txwm muaj mob thiab ruaj khov rau ntau tshaj 5 xyoo nyob rau hauv qhov tsaus ntuj.
3. Yuav siv li cas
(1) Tiv thaiv thiab tswj downy mildew ntawm dib, melons, iab melons thiab lwm yam melons. Pib siv tshuaj tua kab ua ntej lossis thaum pib ntawm tus kab mob. Siv 30-40 grams ntawm 50% dej-dispersible granules los yog 50% wettable hmoov, 20-25 grams ntawm 80% dej-dispersible granules, thiab 40-50 grams ntawm 40% dej-dispersible granules ib daim av . , 60-80 grams ntawm 25% wettable hmoov, 150-200 ml ntawm 10% dej emulsion, sib tov nrog 45-75 kg dej thiab tshuaj tsuag. Siv ib zaug txhua 7-10 hnub, hloov pauv siv cov tshuaj tua kab sib txawv, tsom rau sab nraub qaum ntawm nplooj, thiab siv 3 zaug ua ke.
(2) Tiv thaiv thiab tswj cov kab mob kua txob. Pib txau ua ntej qhov pib ntawm tus kab mob los yog thaum ntxov ntawm tus kab mob. Siv 30-40 grams ntawm 50% wettable hmoov rau ib daim av thiab sib tov nrog 50-75% dej rau txau. Nyob ntawm qhov kev loj hlob ntawm tus kab mob, cov tshuaj yuav tsum tau muab ib zaug txhua 5-7 hnub thiab 3 zaug tsis tu ncua.
(3) Tiv thaiv thiab tswj cov txiv lws suav lig blight. Nyob rau theem pib ntawm tus kab mob, siv 40-60 grams ntawm 50% wettable hmoov thiab 40-50 kilograms dej rau txau.
(4) Tiv thaiv thiab tswj cov txiv lws suav Phytophthora paus rot. Thaum ntxov ntawm tus kab mob, ncuav 50% wettable hmoov 2000 zaug los yog 50% boscalid dej-dispersible granules 1000 zaug tov nrog 50% dimethomorph dej-dispersible granules 750 zaug.
(5) Tiv thaiv thiab tswj cov qos yaj ywm lig blight. Pib tshuaj tsuag thaum ntxov ntawm tus kab mob, siv 1000 zaug ntawm 50% wettable hmoov. Txau ib zaug txhua 7-10 hnub thiab siv nws ua ke nrog cov neeg sawv cev sib txawv.
(6) Tiv thaiv thiab tswj lettuce downy mildew. Pib tshuaj tsuag thaum ntxov ntawm tus kab mob, siv 1000 zaug ntawm 50% wettable hmoov. Txau ib zaug txhua 7-10 hnub, thiab tshuaj tsuag li 2 zaug ua ke, tsom rau sab nraub qaum ntawm nplooj.
(7) Tiv thaiv thiab tswj cov kab mob downy mildew ntawm cruciferous zaub. Siv 20-25 grams ntawm 80% dej-dispersible granules ib daim av los yog 50% wettable hmoov, 30-40 grams ntawm 50% dej-dispersible granules, thiab 30-40 grams ntawm 40% dej-dispersible granules ., 40-60 grams ntawm 25% wettable hmoov, 100-150 ml ntawm 10% dej emulsion, sib tov nrog 30-45 kg dej thiab tshuaj tsuag.
(8) Tiv thaiv thiab tswj cov kab mob yub, kab mob damping-tawm, thiab qia hauv paus kab mob ntawm txiv hmab txiv ntoo thiab zaub. Pib irrigate (los yog tshuaj tsuag) lub noob los yog lub hauv paus ntawm cov nroj tsuag qia nrog cov tshuaj tov los ntawm thawj cov tsos mob ntawm cov nroj tsuag muaj kab mob, ib zaug nyob rau hauv txog 10 hnub, thiab siv cov tshuaj ob zaug ua ke. Feem ntau siv 80% dej dispersible granules 2000-3000 zaug kua los yog 50% wettable hmoov, 50% dej dispersible granules 1500-2000 zaug kua, 40% dej dispersible granules 1000-1500 zaug kua, 10% dej emulsion 300- 400 zaug ua kua.
(9) Tiv thaiv thiab tswj cov kab mob qoob loo ntawm cov txiv hmab txiv ntoo, cov txiv hmab txiv ntoo solanaceous, thiab zaub nplooj. Feem ntau, 35-50 grams ntawm cov khoom xyaw nquag siv rau ib daim av, thiab 30-60 kilograms dej yog siv los txau. Cov tshuaj siv tau zoo tshaj plaws ua ntej tus kab mob tshwm sim los yog thaum qhov txhab tshwm sim thawj zaug.
(10) Tswj downy mildew ntawm ntsuab dos thiab dos. Nyob rau theem pib ntawm tus kab mob, tshuaj tsuag nrog 50% wettable hmoov 600 zaug ua kua. Txau ib zaug txhua 7-10 hnub thiab tswj 2-3 zaug tsis tu ncua.
(11) Tiv thaiv thiab tswj cov strawberry Pythium cag rot. Thaum lub sij hawm loj hlob, tshuaj tsuag 50% wettable hmoov 2000 zaug.
(12) Tiv thaiv thiab tswj Phytophthora cag rot hauv strawberry. Ncuav 2000 zaug ntawm 50% dimethomorph wettable hmoov los yog 600-800 zaug ntawm 69% dimethoyl manganese zinc wettable hmoov.
(13) Tiv thaiv thiab tswj cov qos yaj ywm lig blight. Txau nrog 50% wettable hmoov 1500 zaug ua kua.
