Ginkgo biloba should prevent leaf blight after May

Bacterial leaf blight is the main disease on Ginkgo biloba in Taixing City. When the disease is severe, it can cause the leaves of the whole plant to fall off, and the fruit is dry and thin. The disease is a fungal disease. At the early stage of disease, the tip of the leaf turns yellow. After that, the yellow part gradually becomes brown and necrotic and spreads to the entire leaf margin. Thereafter, the disease spot spreads to the base of the leaf until the entire leaf becomes brown and the coke is shedding.

Ginkgo seedlings generally exhibit symptoms of leaf blight in the middle of June (a few places in mid-May), and large trees show symptoms of leaf blight in July-August. It is the peak of damage from August to September and gradually stops in October. Under the same conditions, big trees are more resistant than nursery trees. Because of the large number of results, large trees of the same age, females consume more nutrients and have decreased resistance to disease. The incidence rate is often higher than that of male trees. The lack of fertilizer in the soil, low waterlogging of fields, plant root injury and other factors can easily lead to plant disease. The incidence of ginkgo and soybeans was light, and the incidence was heavy between pine and ginseng.

For the field of ginkgo leaf blight, the diseased body should be cleaned up after the onset of disease and after the early winter leaves. Normally, it is necessary to strengthen fertilizer and water management, eliminate intercropping with pine trees and metasequoia, and prevent overdose of female plants, and prevent and control underground pests in time. Chemical control should be sprayed on the canopy with 40% carbendazim gel suspension 500 times at the beginning of the disease; during the peak onset in August-September, 70% Mancozeb WP can be sprayed at 600-800 times, every 15 - Spray once a day for 20 days; Bordeaux fluid for 1:2:200 should be sprayed properly in the later stage.

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