There are several kinds of leaf spot disease in bananas, and the common and serious occurrence of the disease is brown spot disease. The disease initially produced red-brown small strips parallel to the veins, spreading on the surface of the leaves, and then the stripes expanded and turned dark. In the middle period, the stripes expanded to become elliptical, brown, with yellow halos surrounding, dark brown later, and intermediate retreat. It is gray and the leaves are dead for a long time.
Pathogen: This disease is caused by fungi.
Transmission route: Conidia of germs spread by wind and rain. The occurrence of diseases is closely related to the climate. The temperature is around 25°C, and the relative humidity of more than 95% is the most suitable condition for the disease.
Prevention methods are as follows:
(1) Be careful to cut off dead leaves and burn them.
(2) Strengthen the cultivation and management, spray strong fruit turf in the young fruit period to enhance nutrient delivery and increase plant resistance to disease.
(3) spraying control. In each year of April, May and June, each drug is sprayed once, and various drugs such as thiophanate-methyl, chlorothalonil, carbendazim wettable powder and the like may be selected to avoid drug resistance. It is recommended to add a new high-fat film to enhance the efficiency of drug use.
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