Ginkgo tree planting: what are ginkgo tree diseases and insect pests?

What are the diseases and insect pests of ginkgo trees? What method is used to control ginkgo tree diseases and insect pests? Please introduce the common diseases and pests of ginkgo trees, such as ginkgo stem rot, mildew, leaf blight, dry disease, ginkgo silkworm moth, peach borer, withered leaf moth, ginkgo super-small leaf roll moth, pod borer, tea yellow thrips and so on. Detailed control methods can be listed as follows: first, the harm of ginkgo stem rot: the disease mainly damages 1-2-year-old seedlings, and it is the main cause of inducing stem rot under high temperature. Under high temperature, the seedlings are damaged, the disease resistance is weakened, and the pathogen grows rapidly, which invades from the seedling wound and causes the disease. In addition, the nursery land low-lying stagnant water, poor seedling growth is prone to disease. The disease is serious when the weather continues to be dry and hot from June to August. Prevention and control methods of ginkgo stem rot: sowing early, improving the Lignification degree of seedlings before the advent of high temperature season, strengthening the resistance to stem rot, disinfecting soil in nursery, proper shading and timely irrigation. In the early stage of the disease, 50% methyl topiramate 1000 times solution was used for prevention and treatment. 2. The harm of Ginkgo biloba mildew rot: the seeds of Ginkgo biloba were damaged during storage, and the disease was spread under the condition of about 20 ℃ temperature and high humidity, and immature or broken seeds were more common. Prevention and control of ginkgo mildew rot: seeds must be harvested after full maturity, while avoiding damage to the seed coat. Cool and dry fully before storage, pick out broken and diseased species, maintain low temperature in the storeroom, and pay attention to ventilation. Use 0 before storage. Soak the seeds in 5% potassium permanganate solution for 30 minutes, or spray disinfection with 40% formaldehyde diluted 10 times. Third, the harm of ginkgo leaf blight: the pathogen mainly overwintered on the fallen leaves and formed spores in March of the following year, infecting new leaves. The disease occurred at the beginning of June, and the peak period was from August to September. The incidence of seedlings is usually higher than that of big trees. Ginkgo leaf blight control methods: strengthen management, eliminate fallen leaves, proper fertilization. Plant tree species reasonably to avoid interplanting with metasequoia, pine, tea and grape. Young and big trees were treated with carbendazim 500 times solution at the initial stage of the disease in early July, and the seedling control time was about from early June to late August, with 0. 5% potassium dihydrogen phosphate, 0. 2% urea solution was sprayed to enhance its resistance. Fourth, the harm of ginkgo dry disease: germs invade the backbone or branches from the wound, forming irregular disease spots on the smooth bark. The disease was spread by wind, rain, insects and birds. New disease spots appeared in the tree trunk after May, and the peak period was from July to September. Ginkgo tree dry disease prevention and control methods: protect the tree, avoid trauma, strengthen the tree potential, improve disease resistance. Eliminate seriously diseased plants and diseased branches and destroy them in time, and smear them with 10% alkali water after scraping, and the effect is very good. Fifth, the harm of ginkgo tree silkworm moth: it is a large moth, which occurs one generation a year. Feed on leaves with larvae. The newly hatched larvae have the habit of living in groups. 1 the 2nd instar larvae could feed from the leaf margin, but the food intake was very small, the food intake increased gradually after the 4th instar, and the 5th instar fell behind into the overeating stage, which could eat up all the leaves. The control method of ginkgo tree silkworm moth is to trap and kill adults with black light from August to September. The damaged leaves were removed before the 3rd instar of the larvae. In case of severe occurrence, 2% deltamethrin 2500 times or 90% trichlorfon 1500mur2000 times were sprayed at the stage of young larvae. 6. the harm of peach borer to ginkgo trees: one generation a year. After hatching, the larvae first crawl for a short distance, then eat into the seed nucleus and eat up all or only part of the seed nucleus, and one larva eats only one seed per birth. The control method of ginkgo peach borer: 1000 times of dichlorvos was used to control the emergence of the first generation adults. 1000 times solution of fenitrothion can be sprayed at the peak of egg incubation, and then sprayed for the second time after 7 days to kill egg hatching larvae. Seventh, the harm of withered leaf armyworm to ginkgo trees: when adults suck fruit juice, ginkgo fruits will fall off within 10 days. The eggs are mostly laid on the leaf back of Tongcao, ten great achievements and other hosts, and the larvae mature and pupate in the soil chamber. Ginkgo tree withered leaf armyworm control methods: root out the ginkgo around the grass, ten major achievements and other host plants. From the beginning of May to the middle of June, 50% trichlorfon 500 times solution was sprayed, and the drug was used again 10 days later, and the effect was the best at dusk. Eighth, the harm of tea yellow thrips to ginkgo trees: both adults and nymphs damage the leaves of seedlings and adult trees, sucking sap on the back of the leaves, and the leaves quickly lose green after sucking, and when the leaves are white and withered, leading to early defoliation, drought conditions are suitable for the occurrence of thrips and damage from seedlings to big seedlings and trees with the increase of temperature. Ginkgo tree tea yellow thrips control method: thistle drug resistance is poor, timely spraying is easy to get the effect, in June-August high incidence period with 80% dichlorvos 1000 times liquid control, spray 2 times, has a good effect. 9. Harm of ultra-small leaf roll moth of Ginkgo biloba: larvae are drilled into branches to damage new shoots of the year, resulting in withered branches, fallen leaves and fruit. The insect has the characteristics of light preference, and the occurrence around the edge of the forest is heavier than that in the forest. The occurrence degree was close to temperature. With the increase of altitude and latitude, the annual average temperature decreased and the population density decreased. The control method of Ginkgo biloba ultra-small leaf moth: 2 before the peak period of adult Eclosion. 5% deltamethrin 2500 times solution for prevention and control. At the initial stage of hatching, the damaged branches were sprayed with 800 times of 80% dichlorvos EC. Tenth, the harm of pod borer to ginkgo trees: the larvae are eaten into the seed nucleus and have the habit of turning fruit to damage. In severe cases, the nucleolus of the seed is eaten up, and only insect dung is left in the seed nucleus, which seriously affects the yield and quality of ginkgo biloba seed. Because the larvae drill into the soil and pupate, their occurrence is closely related to the humidity and texture of the soil, while the occurrence of heavy rainfall and solid soil is lighter. Control methods of pod borer: there are no other legumes around to reduce the damage of transfer and breeding of bean pod borer. During the peak period of adults, 50% dichlorvos or 90% trichlorfon 800-fold solution was sprayed for the second time 10 days later, which had a good effect. Click for more ginkgo tree planting techniques click to get more flower planting techniques