Common diseases and insect pests prevention and control measures of Ginkgo biloba
The common diseases and insect pests of Ginkgo biloba include root rot, stem rot, leaf blight and other diseases and insect pests in nursery, symptoms and control methods, biological characteristics of Ginkgo biloba moth, Camphor silkworm and other insect pests and their control methods.
Prevention and control of diseases and pests in nursery
The main diseases of ginkgo nursery include root rot, stem rot and leaf blight. Insect pests are mainly tigers, Scarab and so on.
1. rotten diseases
Usually occurs in June, the pathogen is Fusarium. The pathogen invades from the root and causes the root to rot and peel, the xylem to be dark brown, and the leaves to wither and wither gradually. There was a high incidence of wet drainage in poor drainage and overdense seedlings. The prevention and cure methods are as follows: 1. Pulling out the diseased plant and burning it in time; 2. Spraying it with 70% tobrazine 1000 times liquid at the onset stage; 3. eliminating the accumulated water in time and improving the seedlings.
2. stem rot
There are two situations: 1. The lignification degree of seedlings is low after they are unearthed, and the pathogens are easy to invade the stems of seedlings, especially in the absence of shading measures and timely watering to reduce the surface temperature. After the pathogen invaded the stem of the seedling, it produced brown spots, which gradually expanded and caused the stem to rot, showing sudden collapse. It usually occurs in early June. One of its prevention and treatment methods is timely watering; the two is spraying 3 times 800 times carbendazim for prevention and treatment. (2) Around July, continuous rainfall and persistent high temperature caused burns to the stem, browning of the stem, decay of the endothelial tissue, gradual expansion to the root, leaf death and droop. Low lying and easy to accumulate water nursery is easy to happen. One of the control methods is to put up a shady shed to cover grass between rows of seedlings to reduce soil temperature in high temperature weather and to irrigate in time when conditions are available. We should pay attention to drainage in rainy days, spray 1% ferrous sulfate solution during the onset of disease, control the spread, and prevent artificial injury to seedlings.
3. leaf blight
In the early stage of the disease, the leaf tip became yellow, the yellow part became brown and necrotic, and the whole leaf became brown and shedding. Generally, nursery stock with excessive growth and poorly ventilated seedlings is more serious. The prevention and cure method is: 800 times liquid of carbendazim.
4. pest control
Soil disinfection. For calcareous soils, 15_of screened agricultural ferrous sulfate powder or 2.5_of Carbendazim and 2.5% of trichlorfon powder were sprayed every 667_. Disinfection of 15~20 KC of sifted carbon powder for non calcareous soil was carried out.
2. Stir up grass and grass with dichlorvos and other liquid to kill pests.