Powdery mildew
1. Pay attention to ventilation and light, keep the field clean, and take off the diseased and old leaves in time at the early stage of the disease; and prohibit heavy water irrigation.
2. Commonly used drugs are: 40% polysulfide suspension 800 times liquid, in the pre-morbidity and early onset of the disease in the noon before the uniform spray, every 5-7 days to spray 1 time, even spray 2-3 times.
Downy mildew
1. Select disease-resistant varieties such as "Qingfeng" zucchini, through cultivation measures to raise the temperature, reduce humidity, control the disease.
2. Chlorothalonil fumigant fumigation, each mu with 45% Chlorothalonil fumigant 200-250 grams, divided into piles placed, evenly placed in the protected area, ignited and smothered shed, generally started in the evening, the end of the next morning. This method can be used at the beginning of the disease.
3. Pharmaceutical control: available 40% ethylphosphine aluminum wettable powder 200-300 times liquid or 72% DuPont Klu wettable powder 800-1000 times liquid spraying. 7-10 days spraying 1 time, alternating medication.
Virus disease
1. Choose varieties with strong resistance to disease such as early green generation, Qishan 2, Weifang 1.
2. After planting, spray 2000 times liquid speed kill Ding and other agents to prevent and control aphids, especially pay attention to the elimination of aphids on the overwintering spinach, celery, in order to reduce the source of viral infestation.
3. Spray 20% virus A wettable powder 500 times liquid at the beginning of the disease, every 10 days to spray 1 time, 3 times.
Whitefly
1. Thoroughly fumigate the residual insect population in the nursery greenhouse before seedling, eradicate weed residues, and install screens in the vents to eliminate the migration of insect sources and cultivate insect-free seedlings.
2. The use of whitefly yellow tendency characteristics, in the early stages of whitefly will be hanging in the greenhouse yellow board, coated with oil, placed in the rows above the plants, trapping adult insects.
3. In the low density of whitefly early spraying, 1 time per week, 3 times in a row. You can use 25% pesticide wettable powder 1500 times liquid.
Leaf miner
1. After harvest, remove the plant residue compost or burn, deep plowing and winter irrigation to reduce the overwintering population base.
2. The farmyard fertilizer is well rotted to avoid attracting seed flies to lay eggs.
3. The egg-laying period and the early hatching period is the right time for pharmaceutical control, and should be sprayed in time. 90% trichlorfon 1000 times liquid can be used. In addition, the adult bugs blooming period spraying 1% mirex emulsion 2000-3000 times liquid.
Red spider
1. Remove the greenhouse and surrounding weeds and dead leaves in time to reduce the source of insects.
2. Pharmaceutical control: spray with 1.8% abamectin emulsion 1000-2000 times or 20% pyridaben wettable powder 1000 times, spray once every 7-10 days, focus on spraying the back of the young leaves and the stem end, spray 3 times.