2024 Tus sau: Chloe Blomfield | [email protected]. Kawg hloov kho: 2023-12-15 23:55
Stately elms ib zaug taug txoj kev ntawm Midwestern thiab Eastern lub zos. Nyob rau xyoo 1930, Dutch elm kab mob yuav luag tshem tawm cov ntoo zoo nkauj no, tab sis lawv tau rov qab muaj zog, ua tsaug rau ib feem ntawm txoj kev loj hlob ntawm ntau yam resistant. Cov kab mob Elm tseem ua lub luag haujlwm tseem ceeb hauv lub neej ntawm cov ntoo thiab ua rau lawv nyuaj rau kev saib xyuas. Txhua tus uas muaj elm nyob rau hauv lawv toj roob hauv pes yuav tsum paub cov tsos mob ntawm tus kab mob kom lawv thiaj li daws tau cov teeb meem tam sim ntawd.
Kab mob ntawm tsob ntoo Elm
Muaj ntau yam kab mob elm ntoo nplooj uas ua rau pom, tawg thiab defoliation. Thaum lub sij hawm cov nplooj poob los ntawm tsob ntoo, cov pob me me tau loj hlob ua ke thiab lwm yam kev hloov pauv tau tsim, ua rau nws nyuaj rau kev sib txawv ntawm cov kab mob yam tsis muaj kev sim kuaj.
Feem ntau cov kab mob elm uas tua cov nplooj yog tshwm sim los ntawm fungi, tab sis elm nplooj scorch, tshwm sim los ntawm kab mob, txawv me ntsis. Nrog rau tus kab mob no, cov kab mob ntawm cov hlab ntsha hauv nplooj tau txhaws kom dej tsis tuaj yeem txav mus rau hauv nplooj. Qhov no ua rau cov nplooj zoo li scorched. Tsis paub kho elm tsob ntoo nplooj scorch.
Cov kab mob elm uas phem tshaj plaws yog Dutch elm kab mob thiab elm phloem necrosis. Dutch elm kab mob yog tshwm sim los ntawm ib tug fungus kislos ntawm elm bark beetles. Cov kab mob microscopic uas ua rau tus kab mob elm phloem kis los ntawm cov nplooj dawb-banded.
Cov kab mob zoo sib xws, nrog rau tag nrho cov nplooj browning ntawm cov ceg ntoo cuam tshuam, tab sis koj tuaj yeem qhia qhov txawv ntawm qhov chaw ntawm kev puas tsuaj. Tus kab mob Dutch elm feem ntau pib ntawm cov ceg qis, thiab tuaj yeem tshwm sim, cuam tshuam rau ib feem ntawm tsob ntoo thiab tawm hauv lwm qhov tsis raug. Elm phloem necrosis cuam tshuam rau tag nrho cov yas ib zaug. Cov kev pabcuam ntxiv rau kev ua liaj ua teb nyob rau ntau thaj chaw nug kom koj qhia txog qhov xwm txheej ntawm cov kabmob no.
Kev Kho Mob Ntawm Cov Ntoo Elm
Thaum elm ntoo nplooj kab mob tuav, tsis muaj kev kho mob zoo. Rake thiab hlawv nplooj los pab tiv thaiv kev kis kab mob. Yog tias koj muaj teeb meem nrog cov kab mob nplooj, sim siv tshuaj tua kab mob thaum ntxov rau lub caij xyoo tom ntej. Qhov no yuav pab tiv thaiv kab mob. Powdery mildew yog lwm kab mob nplooj uas qee zaum cuam tshuam elms, tab sis nws tshwm sim lig rau lub caij uas kho tsis tsim nyog.
Tsis muaj kev kho rau Dutch elm lossis elm phloem kab mob. Tsob ntoo muaj kab mob Dutch elm qee zaum teb rau pruning. Qhov no yog ib qho kev kho mob uas txuas ntxiv lub neej ntawm tsob ntoo rau ntau xyoo yog tias ntes tau ntxov thiab ua kom zoo, tab sis nws tsis yog kev kho. Nws yog qhov zoo tshaj los ntiav ib tus kws kho mob uas muaj ntawv pov thawj rau txoj haujlwm. Tsob ntoo nrog elm phloem necrosis yuav tsum tau muab tshem tawm sai li sai tau.
Vim tias tsis muaj kev kho tau yooj yim, nws yog ib qho tseem ceeb kom kawm paub tiv thaiv tsob ntoo elm los ntawm kab mob. Nov yog qee cov lus qhia:
- Saib cov kab uas ua rau elmtsob ntoo kab mob, thiab pib qhov kev tswj xyuas sai li sai tau thaum koj pom lawv.
- Rake thiab rhuav tshem tsob ntoo elm tawm tam sim.
- Siv tshuaj tua kab mob yog tias koj muaj teeb meem nrog elm tawm xyoo dhau los.
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