Diseases and Pests of Guangdong Dieffenbachia and Their Control

Diseases of Dieffenbachia glabra

Leaf spot

Leaf spot is a common disease of Guangdong evergreen, and it is more likely to occur in rainy seasons.

When leaf spot disease occurs on Guangdong evergreen, spots will grow on the leaves and gradually expand. The color around the spots will fade. In the later stages of the leaf spot disease, the disease will become more serious and turn black-brown.

If leaf spot disease occurs in Guangdong evergreen, the diseased leaves need to be removed in time. When the disease is more serious, it can be sprayed with 1000 times diluted 50% carbendazim for treatment.

anthrax

Anthracnose is also a common disease of Guangdong evergreen, which mainly occurs on the leaves. In severe cases, it can develop to the leaves, causing water-soaked spots to appear on the plants. In severe cases, the spots will become one piece and black spots will appear.

The occurrence of anthrax is mainly caused by poor ventilation, so ventilation needs to be strengthened during maintenance and scale insects need to be prevented and controlled. In the early stage of the disease, you can spray 800 times diluted 60% mancozeb or 1500 times diluted 70% thiophanate for prevention and control.

Pests of Guangdong Dieffenbachia

Brown Soft Scale

Brown soft scale is very harmful to Guangdong evergreen. Generally, brown soft scale will gather on the leaves of Guangdong evergreen, suck the sap of the plant, and secrete mucus to cause the bacteria to multiply in large numbers, resulting in blackening of stems and leaves, poor plant growth, and yellowing of leaves. In more serious cases, the plants will be full of pests.

Generally, in the early stage of brown soft scale infestation, there are relatively few pests and they can be directly scraped off. However, after the nymphs hatch, it is necessary to spray pesticides. Generally, 1000 times diluted 40% malathion emulsifiable concentrate or 1000 times diluted 40% oxydemeton-methyl emulsifiable concentrate can be used for spraying.