What is banana scab? What is the harm of scab?

What is banana scab? What is the harm of scab? How to control scab is an uncommon disease of banana, which mainly harms leaves and fruits. The leaves were damaged, premature senescence and withering, the appearance of diseased fruit was poor, the commodity value was low, and it was easy to rot during storage and transportation. The disease occurred in the lower leaves of the susceptible plants first, and there were many small black grains scattered on the leaves (this is the pathogen conidium). The disease gradually developed to the middle and upper leaves, resulting in a large number of leaves (but young leaves rarely occurred). After hanging the fruit, many small black grains gradually appeared in the turquoise pericarp, and the disease on the outward side of the ear was more than that on the inside of the ear. When the fruit is ripe, brown is more obvious on the periphery of the small black grains. The primary infection source came from diseased leaves and fruits in the field, and the conidia spread with Rain Water and airflow. Every spring rain season, the mature conidia spatter a large number of conidia, infecting leaves and fruits to make it sick. The banana orchards with high fertilizer and dense planting are sickly; the later stage of the calendar fruit is the most susceptible; bananas are more susceptible than pink bananas and plantains. Control methods: ⑴ should pay attention to field hygiene and feed the primary infection source (refer to banana leaf spot). ⑵ was bagged to protect fruit after breaking buds. The specification of the bag is a blue polyethylene film bag with a length of 80 cm 120 cm, a width of 50 cm and a thickness of 0.3 mm to 0.4 mm. The bag body is punched with small holes to dissipate heat in summer. The specific method is to put the ear into the bag, the upper end is tightly tied to the base of the ear shaft, and the lower part is opened for air. Bagging can prevent the bacteria from transferring to the fruit with Rain Water, and has a certain cold-proof effect, but it is easy to cause fruit burns in the middle of summer. ⑶ sprays leaves and fruits with 75% chlorothalonil wettable powder 800 / 1000 times, or 70% methyl topiramate wettable powder 800 / 1000 times, or 40% methomyl glue suspension 600 / 800 times, especially before bagging after the fruit buds are broken. Click to get more banana planting techniques click to get more fruit planting techniques