1. Effect of leaf spot on banana production
Leaf spot disease not only harms banana leaves, but also affects the weight and quality of the fruit. If fewer than 6 healthy leaves are harvested, bananas will be severely reduced. Leaf spot disease can also cause premature fruits and reduce economic value.
2. Control strategies for leaf spot
Leaf spot disease is very difficult to control in hot and humid weather. To effectively control leaf spot disease, it is necessary to adopt comprehensive management strategies, including cultivation and prevention measures and chemical control measures.
1Cultivation control: The purpose of cultivation control is to reduce the number of spores in the orchard and the humidity around the banana leaves. The annual diseased leaf tissue (spore source) should be regularly removed. Use sickle to cut sick leaves and dead leaves. In the dry season, remove all diseased leaves as much as possible so that the plantation is clean in the coming rainy season. Banana plots should be designed to ensure rapid drainage and air circulation. The planting density is reasonable to improve the spray coverage and increase the air circulation in the banana garden, so that the banana leaves are rapidly dried.
2 Chemical Control: Sprayed bactericides should include protective bactericides and systemic bactericides. Due to the thick waxy layer of the banana leaf, banana oil is usually added when the fungicide is sprayed to enhance the penetration of the bactericide in the banana leaf.
Protective bactericides are dithiocarbamates, such as mancozeb, antaisheng; systemic bactericides are benzoimidazoles, such as carbendazim; sterol inhibitors have a defensive force, R & F library, must Shoul.
Protective fungicides should be used before infection. When the pathogen has infected banana leaves, a systemic fungicide should be used. The systemic fungicide can kill leaf spot pathogens at the spotting and striping stage, but cannot be applied later than the late striping stage.
3, the frequency of application (number and interval) depends on the degree of disease development and weather conditions
Because the new leaves are susceptible to germs, the goal of the fungicide is to protect the new leaves. Aircraft spraying has been widely used in banana planting due to its large area for short-term spraying of the plantain garden, especially for the control of airborne ascospores.
4, to prevent the production of fungicides resistance
Frequent application of systemic bactericides to prevent severe diseased leaf tissue may cause populations of leaf spot pathogens to become resistant to fungicides. When the population of leaf spot pathogens is resistant to a systemic fungicide, this fungicide should not be used until a specific leaf spot pathogen population is controlled.
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