Red squash seedlings attention 3 diseases
1. Blemishes: Bleeding and blight frequently occur at the stem base near the ground. It takes only one day from the onset to the emergence of the seedlings. The disease is pre-emerged and causes cotyledon, larvae, and young stems to turn brown. rot. The incidence of seedlings, mostly from the roots of the Ministry began as water stains, and quickly expanded, in the cotyledons still green, wilt, before the roots of the Ministry of contraction and thinning, seedlings lodged deadly. When the humidity of the seedbed is high, a layer of white cotton floc is produced on the diseased area and surrounding beds. In the beginning, only a few seedlings were attacked. When the conditions were appropriate, these diseased plants were the center of rapid spread to the surrounding areas. Fields often formed a patch of wards. 2. Blight: Blight is more likely to die later than the onset of damping off. It is also wilting during the day and recovers at night until it dies but remains upright. After emergence of seedlings and large seedlings can be disease, the incidence of large seedlings is high, generally occurs in the middle and late stages of nursery. Embryonic seedlings and young plants showed reddish-brown indeterminate or elliptical lesions on the bases of the main roots and ground stems. The diseased leaves and stems were wilted during the day and recovered at night and in the early morning. Lesions continue to spread around, and gradually sag, and finally around the stem for 1 week, the base of the stem turns brown and rot, some xylem is exposed, the cortex is cracked and ulcerated, and finally the diseased plant shrinks and dries, the plant dies, but generally still stands Fall, so called blight. Under wet conditions, pale brown spider silk-like mycelium was observed on the epiphyseal site and its vicinity, and later formed granular sclerotia. The diseased seedlings such as damping-off and blight and the soil nearby can both grow white hyphae, and the disease-fighting department resembles white cotton wool. The blight is relatively sparse, but later it may be assembled into small sclerotia. 3. Root rot: The main damage to radicles, larvae, and sometimes diseases spread to the base of the stem, causing seedling rot, the upper part of the disease seedlings first wilting, after the stems and leaves become yellow, and then withered, cut the base of the seedling stem can be seen To vascular become brown. The above disease prevention methods: 1. Soil treatment: First, bed soil with loose fertility and no vegetables for many years must be selected. The water is sprayed on the seedbed evenly with Rhizoctonia, carbendazim and the like. Seedling soil not to use herbicide in field spray to prevent seedling growth or slow growth. Can also be used nursery medium direct nursery to reduce the incidence of seedling disease. 2. Seed treatment: Before the seeds are sown, they are first air-dried in the sun for about 2 hours to kill germs and prevent seeding with bacteria. Seed treatment agents also need to be seeded to prevent disease. 3. Chemical control at the seedling stage: At the beginning of the above-mentioned diseases, thiophanate-methyl or mancozeb-zinc is continuously used for prevention and treatment twice at intervals of 7 days. The carbendazim can also be used to irrigate roots of seedlings in the early stage of disease. Fast Shipping Laser Distance Sensor Hi there, Fast Shipping Laser Distance Sensor,Serial Laser Distance Sensors,USB Laser Distance Sensors,RS232 Laser Distance Sensors Chengdu JRT Meter Technology Co., Ltd , https://www.rangingsensor.com
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