Poinsettia Diseases and Control Methods

Poinsettia gray mold

Gray mold disease often occurs in winter, which is the season when flowers bloom. Once it encounters continuous rainy, humid and sunless weather, gray mold disease will be out of control. Brown spots appear on the leaves, branches, and inflorescences, spreading throughout the plant as the disease progresses.

Therefore, especially in winter, strong maintenance and management are required to increase indoor temperature, enhance light transmittance and reduce humidity. Once diseased plants are found, immediately move them to a ventilated place and place them in the sun, which can achieve effective prevention and control effects. In addition, when the disease is serious, Bordeaux liquid can be sprayed for treatment.

Poinsettia Root Rot

Root rot usually occurs in hot seasons, but soil, watering and other factors can also induce this disease. Light brown spots can be seen on the roots of infected plants, but it is difficult to find symptoms above ground in the early stages. As the disease worsens, the lesions spread upward and the plant will gradually wither. In the later stage, the plant will die due to lack of water because the roots cannot absorb water.

Strengthen maintenance at ordinary times, change the soil in time, loosen the soil frequently, and ensure that the roots have sufficient oxygen to breathe. In addition, during the maintenance process, the roots can be irrigated with disinfectant once a month to inhibit fungal growth.

When the roots are rotten, remove the plant from the pot, cut off the rotten parts, and replant it. If the root rot is serious, just throw it away.

Poinsettia leaf spot

It occurs more seriously in spring and summer, and the lesions mostly start to appear on old leaves. In the early stages, irregular spots appear on the leaves, which quickly expand and spread, causing the leaves to twist and dry out.

If you find spots on the leaves, remove them immediately and throw them away. Clean up dead leaves regularly and keep the surface of the potting soil clean.

When the disease is serious, spray pesticides. You can choose 1000 times solution of Benomyl and spray it once every 5 to 7 days. The condition will improve in 3 to 5 days.