Symptoms: it is mainly caused by bacterial infection. The pathogen invades from the stem. At the beginning of the disease site, there will be light brown water spots, which will gradually spread to the stem and petiole of the plant. Many white flocculent hyphae will be produced in the diseased area.
Prevention and control: pentachloronitrobenzene, Sclerotinia and bactericide can be selected for spray control.
Symptoms: the diseased part will appear water stain like spots, then turn brown and then become sticky, slippery and soft rotten. There are white, yellow or grayish brown paste like viscous substances mixed in the soft rotten tissue, which can give off a foul smell.
Control: Agricultural streptomycin can be used to spray the plant and rhizosphere soil for control.
Symptoms: virus disease is a kind of disease caused by very small parasites. The affected plants are prone to distortion, rolling leaves, dwarfism and other symptoms.
Prevention and control: jiedukang, xiaoyedi and virus a mixed spray, W2000, etc.
Symptoms: whitefly is white and small in size. When the plant is damaged, the leaves will gradually turn yellow and fall off.
Prevention and control: enemy killing, dimethoate, Omethoate and dichlorvos spray can be used for prevention and control.
Symptom: it affects the ornamental value of the plant and is fatal to the foliage plant. When the larvae get sick, they will get into the mesophyll and form a white tunnel on the leaf. It usually appears in May and lasts until August.
Prevention and control: root can be irrigated with 40% Omethoate emulsion 1000 times for prevention and control.
