Drying disease

Drying disease, also known as chestnut disease, chestnut carcass blight, chestnut bark disease, is a fungal disease. Pathogenic bacteria from the wound invasion, mainly harmful to the trunk and branches, the initial stage is not easy to find, with a knife to scrape the bark, visible reddish-brown spots, spots connected to the block, the surface of the bark raised bubble, flaccid, cortex internal decay, flow sap, with the smell of wine, gradually dry shrinkage, the later part of the disease is slightly enlarged into a fusiform, the bark is cracked or off, affecting the growth of the heavier withered. Drying disease spread by rain, birds and insects, mainly by a variety of wound invasion, especially grafting mouth is more.

Prevention methods: ①Strengthen fertilizer management, enhance tree strength. ② cut off the diseased branches, remove the source of infection. ③ Avoid human and animal damage to the branch bark, reduce the wound. ③ Avoid damage to the bark of branches and trunks to minimize wounds. ④ Protect the trunks in winter by painting them white. ⑤ In early April and early to mid-June, scrape off the diseased bark, each coated with 1 time sodium carbonate 10 times liquid, the cure rate can reach 96%. It can also be painted with 50% carbendazim or 50% tolbutazin 400-500 times liquid, or 5 boomer degrees of sulfuric acid, or 50% diclofenac ammonium 500 times liquid. Scraping down the bark should be centralized and burned.

Powdery mildew

Powdery mildew is a fungal disease that mainly affects seedlings and young trees, and the young leaves of the affected plants are curled, yellowed, scorched, and peeled off, seriously affecting growth. Victims of young leaves at the beginning of the yellow spot, the leaf surface of the back of the leaf was white powdery mold layer, autumn in the white powder layer appeared many needle-like, the first yellow-brown and then turned black-brown small particles, that is, the pathogenic bacteria of the closed capsular shell. The pathogen overwinters on the fallen leaves and spreads the infestation by airflow in March-April.

Prevention methods: ① winter removal of fallen leaves and burned to reduce the source of disease. ② during the onset of spray 0.2-0.3 degrees of sulfuric acid, or 0.5:1:100-1:1:100 Bordeaux solution, or 50% of the retreat 1000 times. ③ Strengthen cultivation management, enhance disease resistance. Chestnut rust

Chestnut rust

Fungal disease, mainly affecting seedlings, causing early defoliation. Affected leaves on the back of the yellow or brown vesicular spots on the rust spore heap, ruptured and dispersed yellow rust spores. Winter spore pile is brown, waxy spots, not rupture.

Prevention methods: remove fallen leaves in winter to reduce the source of disease. Spray 1:1:100 Bordeaux solution before the onset of the disease.