Control of various diseases and insect pests of Schisandra chinensis
(1) Powdery mildew and black spot are two common diseases of Schizandra chinensis, which usually occur in early June. Control methods: The initial period of the two diseases is similar, spraying 1 time in late May, 1:1:100 times the same amount of Bordeaux mixture for prevention, if there is no disease occurrence, can spray 1 time in 7 - 10 days. For powdery mildew control, 0.3 - 0.5% sulfur mixture or powder rust, thiophanate-methyl WP 800 times solution; black spot control with mancozeb 50% WP 600 - 800 times solution. If both diseases are developing, triadimefon and mancozeb can be mixed for primary control, and the concentrations mentioned above can still be used.
(2) Root rot occurs from early May to early August and damages roots. Control methods:
① Select land with high dry terrain and good drainage for planting;
(2) 50% carbendazim 500-1000 times solution was used to irrigate rhizosphere during disease onset period.
(3) Leaf blight occurs from late May to early July and damages leaves. Control method: At the early stage of disease, 50% topozine 1000 times solution and 3% Jinggangmycin 50 ml/liter (PPm) solution were sprayed alternately. The number of sprays depends on the condition.
In management, attention should be paid to the rational distribution of branches and vines, and the proportion of phosphorus and potassium fertilizer should be appropriately increased to improve the disease resistance of plants; before germination, the diseased branches and leaves should be cleaned up and burned or buried deeply, and the whole garden should be sprayed with 5-degree sulfur mixture once. In order to prevent blight and other soil infectious diseases, after sowing and covering soil, combined with watering, spraying 800-1000 times of 50% of ammonium bromide.
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Control methods of diseases and insect pests of Gastrodia elata
First, the disease and its prevention and control 1, the cause of the disease. The pathogens of Gastrodia elata disease are mainly basidiomycetes other than Armillaria mellea in fungi, which infect the fresh and fungus materials of symbiotic Armillaria mellea and compete with Armillaria mellea for nutrients, which will not only inhibit the growth of Armillaria mellea and reduce the yield of Gastrodia elata. It will also directly infect the tuber of Gastrodia elata, causing Gastrodia elata rot soft rot (called tuber soft rot) or rot death (called tuber rot). Most of the disease is in bad environment, such as high temperature, high humidity, poor ventilation and so on, which is not conducive to the growth of Gastrodia elata, resulting in the yellowing of the tuber skin of Gastrodia elata.
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Control of diseases and insect pests of Schisandra chinensis
The main results are as follows: (1) the leaf blight starts from the leaf tip or edge in the early stage, infects the whole leaf surface, makes it withered, yellow and shedding, and the ear falls off in severe cases. Prevention and control methods: strengthen field management, pay attention to ventilation and light transmission. At the initial stage of the disease, the patients were sprayed with 100-fold Bordeaux solution, once every 7 days, several times in succession. (2) the leaf curler larvae are harmful, causing curling leaves, affecting the growth of fruit, and even shedding. Control methods: use 50% phoxim 1500 times or 50% phoxim 1500 times or 40% dimethoate 1000 times or 80% trichlorfon
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