Gum disease, black spot disease, sand skin disease and brown stalk rot can be called resin disease, which occurs in different parts and at different times.
It is usually called resinous disease or gummosis on the branches; black spot disease or sand skin disease on the peel and leaves; brown rot on the fruits during storage.
Production principle
The pathogen mainly overwinters in the diseased tree with mycelium, sporophyte and conidia, which are transmitted by wind, rain, insects and other media. Spores can germinate and infect only when there is water, and the suitable temperature is 15 ~ 25'c. The pathogen is a weak parasite and can only invade from the wound of the host. If the tree is weak, it may aggravate the disease. When the pathogen infects the new tissues such as the tender leaves and young fruits with no wound and strong vitality, it is blocked in the epidermis of the host, forming many colloidal small black spots. Therefore, only when the host has a large number of wounds, and when the rain is abundant and the temperature is appropriate, the branches flow glue, dry up and fruit stalk rot will be popular. However, the occurrence of black spot and sand skin only needs more rain and proper temperature.
Control method
(1) Winter or early spring. In winter or early spring, the dead branches of the diseased branches were cut off and taken out of the garden for centralized burning, and 0.8% Bordeaux solution, or 0.8 ~ 1 baumead mixture of sulfur and soda 8 ~ 10 times solution could be sprayed for garden clearing. If the disease occurs on the branches, the diseased tissues on the branches shall be scraped off thoroughly in spring. After disinfection with alcohol, 50% thiophanate methyl wettable powder 100 times solution, allicin ethyl, copper sulfate 100 times solution and other agents shall be applied.
(2) Germination stage of spring shoots. Spray 0.8% Bordeaux solution or 80% mancozeb WP 600 times at the germination stage of spring shoots.
(3) From 2 / 3 of blossom to fruit expansion. Spraying was started at 2 / 3 of the time of flower fading. 80% mancozeb wettable powder was 600 times liquid and 99% mineral oil was 250 times liquid. Spray once every 14-20 days until the end of fruit expansion period.
(4) Other prevention and control measures. Build a protective forest, do a good job in anti freezing, drought and waterlogging, and keep the tree strong: for the orchard with sparse cultivation, paint the trunk white before midsummer to prevent sunburn; for the orchard with poor tree potential, spray humic acid water-soluble fertilizer before fruit picking to stabilize the tree potential, and apply organic fertilizer and water fertilizer after fruit picking to restore the tree potential.
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