Control of Colletotrichum gloeosporioides

Symptoms: light brown spots appear on the leaves at first, and with the development of the disease, the spots gradually expand into a round or oval shape (semicircle if the spot occurs at the leaf edge). The part of the disease has wheel lines, and there are many small black grains in the later stage, and pink sticky material is gushed out under wet conditions.

Pathogen and disease status: the disease is caused by a kind of anthrax (fungus) infection. The disease occurs more frequently when there is too much nitrogen fertilizer and relatively lack of phosphorus and potassium fertilizer in cultivation. The disease is serious in the climate with high temperature, rainy and humid climate. Potted flowers are easy to develop due to over-dense or over-watering, poor ventilation and high humidity.

Prevention and control measures:

1. Strengthen cultivation management: it is not suitable to apply nitrogen fertilizer, but to increase phosphorus fertilizer and potassium fertilizer properly to enhance plant disease resistance. Indoor flowerpots should not be placed too tight and should be well ventilated. Water should be injected from the rim of the basin. Cut off the diseased leaves or plaques. And burned or buried in time to reduce the source of infection.

2, chemical control: during the onset of the disease, 50% carbendazim can be sprayed, or 1000 times of methyl thiophanate can be sprayed, or 70% anthrax can be sprayed once.

Bacterial soft rot of Cymbidium

Bacterial soft rot is also a common disease of Cymbidium. The disease often causes the soft rot of the leaves, the lodging of the plant in severe cases, the ornamental effect on the light ones and the rot of the whole plant in the severe ones.