Ball orchid diseases and prevention methods

Hoya anthracnose

symptom

Anthracnose of Hoya usually infects the plant through wounds. Initially, a number of light yellow, dark brown or light gray spots appear on the leaf surface, sometimes forming several black bands. When the spots expand, the surrounding tissues turn yellow or gray-green and sink. In severe cases, the entire plant may die.

Prevention and treatment methods

Strengthen management, do not plant too densely, maintain good light and ventilation, water from the edge of the pot, if there are damaged leaves, cut off the diseased leaves in time, avoid sunburn, cold damage, fertilizer damage, and drug damage, and reduce the occurrence of anthracnose.

Take routine prevention measures and spray regularly with 600 times diluted 80 % anthrax thiram or 1000 times diluted 70 % thiophanate methyl.

Hoya soft rot

symptom

Soft rot is prone to occur in high temperature and high humidity environments. It is more likely to occur in the rainy season in early summer and less likely in winter. Initially, water-soaked spots appear on the leaf surface and petioles, and then they wilt and droop, losing their ornamental value. Generally, the whole plant is infected. When the leaves are affected, they appear as dark green water-soaked spots, which quickly expand to become yellow-brown soft rot, with brown water droplets oozing out and a special odor.

Prevention and treatment methods

Once the plant becomes sick, the diseased leaves should be cut off in time and the wounds should be coated with M-45 cornstarch to prevent reinfection.

Use 5000 times of agricultural streptomycin or 1000 times of methyl polysulfonate for spraying for prevention and control.

Hoya rust

symptom

In the early stage, orange-red spots appear on the leaves of the Hoya orchid, and in the later stage, brown spores appear on the back of the leaves.

Prevention and treatment methods

Disinfect the cultivation medium in advance, strengthen environmental management, maintain ventilation and light, and remove diseased leaves when necessary.

When the disease occurs, spray 800 times of 50 % carbendazim or 1000 times of 70 % thiophanate-methyl for prevention and control.