Recently, the friends of the farmers in southern Jiangxi Province reported that the peach trees in his family had yellow water on their trunks. After a few days, the yellow water dried up and turned into brown plastic blocks. Finally, the peach trees died. Ask the experts what is this disease? How to prevent? According to the situation of the farmer's friend, after detailed communication, the expert judged that it was peach tree dripping gum disease. Here is a brief reply from the questions of the farmers' friends:
First, the symptoms
After the peach trees became infected, on the branches, translucent yellow liquid (gum) flowed out of the diseased part, and the flow of glue was more serious after the rain. The flow glue turned into a reddish-brown color upon contact with the air, showing a jelly-like shape, and turned into a red-brown hard plastic block after drying. The diseased part is easily infested by saprophytic bacteria, which causes the cortex and xylem to turn brown and rot. The lighter ones are debilitated and the whole plant is dead. Onset of fruit, secrete yellow gum from the nucleus, overflowing the fruit surface, hardening of the diseased part, cracking when severe, and inedible.
Second, transmission routes and disease conditions
One of the causes of peach gum disease is an invasive flow caused by Ascomycetes fungus. This pathogenic bacteria winters on damaged branches. In the spring of next year, pathogens spread and spread in the fields through wind and rain. The other is non-invasive fluids caused by improper management of tree wounds or cultivation due to various reasons. The activity of pathogenic bacteria in the dried peach branches is closely related to the temperature and humidity. Warm and humid weather is conducive to the occurrence of gum disease, while high temperatures can inhibit the occurrence of diseases. Infertile soil, lack of fertilizer and water, extensive orchard management, and many tree-wounded or overloaded orchard-debilitated orchards cause serious gum leakage.
Third, control methods
1. Strengthen orchard management Strengthen the management of fertilizer and water in orchards, increase organic manure and phosphorus and potash fertilizers, increase tree vigor, and increase tree disease resistance. In combination with autumn fertilization in the fruit period of peach trees, 250 g of lime nitrogen (calcium ammonium cyanide) per plant was applied to prevent and cure the disease. The effect of preventing and controlling the flow of gum was above 90%, and continuous treatment can basically cure the disease.
2. During the growth of pathogenic peach trees, scrape the glue on the branches and spray them with quicklime powder on the gel. In the early winter, the peach trees are combined with winter cutting after defoliation to remove defoliation and damaged shoots. The rough skin and plastic blocks of the diseased part are scraped off, then disinfected with lime sulfur, or 50% of the WP wettable powder 50 grams plus 50% sulfur. Suspending agent 250 g mixed and applied.
3. Chemical control During the growth of peach trees, spray 50% Carbendazim WP 800 times, or 50% Sulfur Suspender 500 times, or 50% Thiophanate Sulfur Suspender 400 times, or 50% benomyl WP 1500 times, or 70% thiophanate-methyl WP 1000 times, once every 15 days for 3 to 4 consecutive times. Http://Content/621dcc7a-7380-40cb-a6a5-820ba6528fb7?cType=2
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