Planting greenhouse cucumbers are usually nursed from December to January every year. If the weather conditions are not good at this time, the seedlings are susceptible to damping-off and blight, causing seedling lodging and dead seedlings.
The catastrophic disease was characterized by the contraction of the cucumber seedlings at the base or middle of the stem, and the plants quickly lodged on the seedbed in patches until the plants died. Blight is mainly caused by rotten species, rotten buds, and the bud has a round dark brown spot on the base of the stem, which causes the wilting of the cotyledon during the day, the diseased part shrinking and dying, and stands upright. In addition, cucumber rooting is also prone to emergence, showing no new roots and rotten roots, leaves yellow, scorch; also prone to stiff seedlings, showing a small leaf, root less. For disease prevention at the seedling stage, prevention should be the main priority. Vegetable farmers should pay attention to the following points:
1. Do a good job of seed disinfection. Seeds of cucumber are soaked in warm water at 55°C for 10 to 15 minutes, stirred continuously, cooled and soaked in warm water at 30°C for 6 hours, then disinfected with 10% trisodium phosphate for 30 minutes, and the seeds are picked up and dried with a dry towel or dried. . Can kill the seeds of bacteria, such as disease, virus disease, anthrax, blight, keratoses.
2. Bed soil disinfection. Use 50% carbendazim 0.5 kg per acre, add 100 kg of dry soil, and evenly cover the seeds.
3. Disease prevention and control. Post-emergence management can spray 10% Amisida 1500 times for prevention.
If the seedling stage is infected with damping-off disease, use 98% hymexazide wettable powder 3000 times, 64% antivirus powder wettable powder 600 times, 50% carbendazim wettable powder 600 times liquid, 7 to 10 days 1 Times, spray 2 or 3 times. 50% Carbendazim WP plus 70% Mancozeb 600 times after onset of blight. When the blight and damping-off diseases were mixed, spray with 72% Preclosure 800 times solution plus 50% thiram 800-fold spray.
4. Control of roots and seedlings. Mainly to improve the temperature of the nursery shed, geothermal lines, lights, small sheds and other ways to increase temperature. In addition, the leaves were sprayed with 6000 times liquid of estutonin, or 6000 times more love and 400 times of nucleotide leaf fertilizer, in order to promote root growth, so that the growth of seedlings returned to normal.
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Nisin (CAS 1414-45-5) is light brown powder, a polycyclic antibacterial peptide produced by the bacterium Lactococcus lactis that is used as a food preservative. Streptococcus, security is very high. Lactic streptococcus, but with other preservatives of anti-corrosion system, can effectively protect the food from microbial destruction, now is widely used in meat products, dairy products, etc.
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