Control of Powdery Mildew of Lycium barbarum L.
[symptom characteristics] mainly harms the leaves. The leaves are covered with white mildew spots (initial) and powder spots (later). This white mildew spot and powder spot are not only the symptoms of the disease, but also the symptoms of the disease (conidiophores and conidia). In severe cases, the plant of Chinese wolfberry appears white, which is quite eye-catching. The photosynthesis of diseased plants was blocked, which eventually caused the leaves to turn yellow and easy to fall off.
[pathogen and pathogenic characteristics] the pathogen is Oidiumsp. In cold areas, the pathogen overwintered in the soil with the disease residue as a sexual fruiting body. In warm areas, the pathogen mainly carried out the initial invasion and re-invasion by apomorphic conidia, and completed the annual cycle of the disease, and there was no obvious overwintering period. Warm and humid weather or planting environment is conducive to the disease. However, the spores of the pathogen have the characteristics of drought tolerance and can still sprout and infect and cause disease under the condition of high temperature and drought.
[prevention and control methods] early spraying should be used to prevent and control the disease. Like rust, powdery mildew is sensitive to triadimefon and to organic or inorganic sulfur fungicides. Before the onset of the disease, no later than after the onset of the disease, 45% lime-sulfur mixture crystallization or paste 300 times, or 50% colloidal sulfur or ultra-fine sulfur suspension 200 times 400 times, or 15% Fenruoning wet powder 2000 times, or 70% mancozeb 600 times, 2 times 3 times, every 7 days or so (colloidal sulfur, stone sulfur mixture, ultra-fine sulfur suspension) or 10 days (mancozeb) to more than 20 days (strychnine), apply alternately Spray foot evenly to prevent and control the disease.
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Planting Gastrodia elata to grasp three key points can produce high yield.
1. Armillaria mellea needs three new strains. 1. New technology: new methods to obtain new strains. The new method is to use the latest biotechnology to detoxify the bacteria, which is by far the most advanced method to obtain strains. The traditional Armillaria mellea strain has the best effect on the organization.
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A New Method of High Grafting Walnut
At present, large-scale cultivation of walnuts, most of the seedlings. These seedlings, population mixed, serious degeneration of species, low yield, poor quality. The results showed that the yield of early bearing walnut varieties could be significantly improved by using the method of high grafting and seed exchange, and the yield of late bearing walnut varieties could be significantly improved by using the method of high grafting and seed exchange.
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