Control of Colletotrichum gloeosporioides

The pathogen of Colletotrichum gloeosporioides is Micromonosporium. The disease mainly infects leaf tip and leaf edge, and its symptom is similar to that of leaf spot. At the initial stage of the disease, there are moist brown plaques, sometimes pink colloid mucus. After development and diffusion, it showed a semicircular or irregular oval reddish purple or dark purple spot, light brown or grayish white in the center, and slightly sunken. After the onset of the disease gradually enlarged, the wheel marks can be seen around the brown. The plaque gradually shrunk and dried up, and there were black particles scattered on the spot. When the disease is serious, it causes the whole leaf to blacken and wilt. Summer temperature is higher, rainfall increases, the soil is too wet, is the most prone to anthrax season. Improper fertilization, especially excessive amount of nitrogen fertilizer, or no application of phosphorus and potassium fertilizer is the main cause of the disease. The prevention and control methods are as follows.

1. Strengthen plant maintenance, increase the application of phosphorus and potassium fertilizer, control nitrogen fertilizer, and improve the ability of disease prevention.

two。 Improve environmental conditions and pay attention to ventilation and lighting. The basin soil should be well drained. Cut off the diseased leaves and destroy them in time.

3. Control shell insects to reduce infection. Spray 50% omethoate emulsion and 50% marathon 1000 times during incubation.

4. The plant sprays 1000 times of 50% tophan wettable powder, 60% anthrax Fumei 800 1000 times of anthrax, once every 7 times every 10 days, for 5 times in a row, which can play a good role in prevention and treatment.