Causes and drug regimen of anthracnose of Zucchini
Causes of the disease: mainly mycelium or sclerotia on the seeds of zucchini, or with the diseased plants in the field overwintering, when the conditions of the next year are appropriate, a large number of conidia are produced, which becomes the primary source of infection. The conidia of the pathogen are spread by rainwater, and the spores are germinated at a suitable temperature of 22-27 °C. The growth of the pathogen is 24 °C, below 8 °C, and growth stops above 30 °C.
Control methods: 1. To keep seeds from disease-free plants, the bitter melon seed coat is thick and hard, and the seedlings are slow under the low temperature conditions in early spring, and the disease persists in the soil for a long time. It must be seeded with a new high-fat film before sowing. Keep warm, moisturize, and swell, increase seed germination rate, and make seedlings strong. Repel underground pests and isolate viral infections. It can also be mixed with a seed coating. 2. The ground temperature is higher than 10 °C, the northern greenhouse is suitable for sowing in early April, and the seedling period is 20 to 30 days. The growth potential is strong for disease resistance. 3. Apply compost or fully decomposed organic fertilizer, and carry out rotation for more than 3 years. If necessary, disinfect the seedbed to reduce the initial infection source. 4. Strengthen the humidity management of the room temperature. Ecological control in the shed, that is, ventilation and drainage, so that the humidity in the shed is kept below 70%, reducing leaf surface condensation and spitting. Field operations, in addition to disease and pest control, tying vines, harvesting should be carried out after the dew is dried, reducing the spread of human transmission. 5. Spraying a new high-fat film 600 times before the onset of disease, it can automatically form a polymer protective film that is invisible to the naked eye to optimize the water absorption, breathability and light transmission quality of the plant. Blocking pests and smuggling signals and weakening the media to resist and defend against natural environmental disasters. In the early stage of the disease, timely application of highly targeted agents in combination with the new high-fat membranes alternately rotate to increase the control effect and reduce the amount of pesticides .
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