1.Yog cov nplooj yellowing sai heev nyob rau hauv tag nrho lub vaj, nws yuav yog ib tug phytotoxicity;(vim tias tsis muaj cov as-ham lossis kab mob, nws tsis zoo li tias tag nrho lub vaj yuav tawg sai sai).

2. Yog hais tias nws yog sporadic, ib feem ntawm cov nroj tsuag nplooj yellowing thiab muaj ib tug txheej txheem, tej zaum nws yuav tsis muaj as-ham, kab mob hauv paus los yog nplooj kab mob.

3. Yog tias cov nplooj nplooj ntsuab ntsuab, tab sis cov hlab ntsha yog daj, nws yuav yog hlau lossis magnesium tsis txaus.Peb tuaj yeem txuas ntxiv subdivide.Yog tias cov nplooj qub daj thiab cov nplooj tshiab tsis daj, nws tuaj yeem pom tias tsis muaj magnesium;yog tias cov nplooj qub tsis daj thiab cov nplooj tshiab yog daj, nws tuaj yeem pom tias tsis muaj hlau.

4. Yog tias cov hlab ntsha ntawm cov nplooj daj daj thiab cov hlab ntsha muaj xim ntsuab, nws tuaj yeem txheeb tau tias yog kab mob.

5. Yog hais tias muaj pob daj ntawm nplooj daj, thiab macula yog maj mam necrosis, nws tuaj yeem txheeb xyuas tau tias yog kab mob fungal ntawm nplooj.

6. Yog tias cov nplooj daj nplooj qhuav los ntawm ntug ntawm nplooj ua ntej, tab sis cov hlab ntsha thiab cov hlab ntsha tseem zoo li qub, nws tuaj yeem txheeb xyuas tias cov hauv paus puas lossis cov chiv puas.

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