Ginkgo biloba extract of the outer seed coat of apple anthracnose and other 11 plant diseases, the inhibition rate of 88% to 100%. The alcohol extract has a control rate of 100% within 3 days, and it can also prevent and control pests such as leafhoppers, peach aphid, and aphid warts. The following are common symptoms of Ginkgo biloba: Stalk rot stalk rot is one of the most concerned ginkgo disease at present. In the early stage of infection, the stem base near the surface of the epidermis and the underlying root tissue became brown, resulting in water-stained lesions. The above-ground leaves lost chlorosis and droop, and the disease spreaded around the stem base and spread to the upper part of the seedlings. The whole plant withered, when the leaves drooped orange but did not fall off. Seedling stem bark swollen and swollen, peeled off the victim's cortex, visible under the cortex has spoiled as a sponge or powder, gray, it is full of many small black sclerotia. The disease spreads to the roots, making the root phloem brown and decaying. The cortex is rotted. The gray mycelium grows on it, and the seedlings are forced to pull off, and the root cortex can be seen to fall off. Control methods: 1. Ginkgo stalk rot prevention is the focus of soil treatment and seedling disinfection, the use of organic fertilizer to fully decomposed. 2. To cultivate healthy seedlings, improve the disease resistance of seedlings, timely irrigation and loose soil weeding, and do not touch the seedling stems when weeding. 3, strict control of moisture, to prevent excessive humidity, seedlings too dense. 4, in the winter to prevent frost damage and improve seedling resistance. Dead seedlings were found to be removed in time and burned in a concentrated manner to avoid spreading. 5. Nursery sites should not be located in low-lying areas. Using enough manure or cotton cake as base fertilizer can reduce the incidence. The above-mentioned measures should be used in conjunction with the use. If shading conditions are good, less or no drugs can be used, and the risk of stalk rot will also be reduced. 6, after the disease with 50% carbendazim WP 200 to 300 times spray, spray once every other week, a total of 2 or 3 times. Dry leaf disease Ginkgo biloba, also known as ginkgo Blight. After the occurrence of the disease, round or irregular spots on the bark occur, and the swelling is growing day by day. The bark cracks longitudinally. In the spring, many yellowish Pseudopothocyta spores can be seen on the damaged bark. When the weather is wet, a light yellow or yellow tendril-like conidiophore angle can be extruded from the cormorant. In autumn, the sub-seat becomes red to red, and the ascospora shell gradually forms in the middle. With the spread of lesions, the tree can become a ring of necrosis, eventually leading to the death of shoots and plants. Control methods: 1. Strengthen management, increase tree vigor, and increase plant resistance to disease. This is a key measure to prevent ginkgo biloba disease. 2. For pathogenic strains, pathogens should be cleared thoroughly and promptly. Severe or dead branches need to be burned to reduce the source of infection. 3, for the formation of lesions should be promptly scraped, scraping depth should reach the xylem, and 1:100 Bordeaux mixture or 50% carbendazim WP 100 times or 0.1 of mercury, 1% ferrous sulfate Solution, lime coating agent brushing the wound to kill bacteria and prevent the spread of bacteria. Ginkgo biloba disease Ginkgo biloba disease often jeopardizes the stems and leaves of young seedlings, especially the most serious grafting interface. The affected petioles are grayish black. Leaf disease, lesions of white margins spread to the leaves, the diseased leaves scalded with boiling water, the lesions spread to the whole leaf, leaves wilting, and finally the leaves turn yellow; the bacteria invade the top buds, the entire top buds black withered, in Under natural conditions, it is difficult to see symptoms at the site of the disease. The damaged stems produced water-stained lesions that spread around the stems. When the lesions expanded for a period of up to a week, the leaves above the lesions wilted, followed by yellow, and the stems became black. Occurrence: The disease often occurs from April to June every year. The period from the beginning of May to the beginning of June is the period of high incidence of disease, because the temperature at this time is most suitable for the growth of the pathogen. After June, the condition is not developing. The disease often harms young seedlings, and the trees that have grown for years are less victimized. The disease seedlings are generally the victims of the stem, and the roots are rarely victimized. Affected nursery stocks often die, and the resulting shoots of large trees that have been produced for many years generally do not die, but affect the quality and yield of ginkgo biloba. Control methods: 1. Completely clean the garden, dig out the diseased plants, cut the disease slightly, and burn them together. 2. Prior to the occurrence of the disease, spray poisonous toads, 500 to 1000 times of Toxin and spray 1-2 times. Early yellowing Gingko early yellowing is a physiological disease caused by zinc deficiency. A pale yellow lesion appeared on the edges of the diseased leaves and there was reflection; then, the lesions expanded toward the leaf base and gradually half of the leaves turned brown; finally, the leaves turned brown, gray, dead or fallen ahead of time. Occurrence: The onset of yellowing disease and the expansion of lesions have nothing to do with weather conditions, but due to the long-term use of chemical fertilizers in nurseries, organic fertilizers are rarely applied, resulting in soil-deficient zinc, low humus content and poor fertility. In severe cases, the morbidity rate reaches 80%, which usually occurs in early June of each year. During the period from mid-July to late August, the lesion rapidly expands and the diseased leaves die. Control methods: 1. From late March to early April, apply zinc fertilizer to the diseased ginkgo, and apply 80 to 100 g of zinc sulfate to each tree, and apply 1000 to 1500 g of zinc sulfate to each tree. 2. During the dry season, do a good job of watering, and do a good job of drainage work during the flood season.
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