How to prevent and treat anthracnose in clivia? These methods you need to master

The pathogen of clivia anthracnose is Gloeosporium sp. The disease mainly infects leaf tips and leaf edges, and the symptoms are similar to those of leaf spot disease. In the early stage of the disease, moist brown lesions appear, sometimes with pink gelatinous slime. After it develops and spreads, semicircular or irregular oval red-purple or dark purple lesions form, with the center being light brown or grayish white and slightly sunken. After onset, they gradually expand, and brown concentric ring markings can be seen around them. The lesions gradually shrink and dry up, with black granular substances scattered on them. When the disease is severe, it causes the entire leaf to turn black and wither. Summer, with higher temperatures, increased rainfall, and overly wet soil, is the season when anthracnose is most likely to occur. Improper fertilization, especially excessive nitrogen application, or failure to apply phosphorus and potassium fertilizers, is the main cause of the disease. The control methods are as follows.

1. Strengthen plant care, apply more phosphorus and potassium fertilizers, control nitrogen fertilizer, and improve disease resistance.

2. Improve environmental conditions, and pay attention to ventilation and light. The potting soil must have good drainage. Prune diseased leaves and destroy them promptly.

3. Control scale insects to reduce infection. During the egg incubation period, spray 50% omethoate emulsifiable concentrate or 50% malathion 1000-fold solution.

4. Spray plants with 50% thiophanate wettable powder 1000-fold solution or 60% anthracnose formalin 800—1000-fold solution, once every 7—10 days, for 3—5 consecutive times, which can provide good control.