What are the control methods for zucchini brown spot disease?
There are mainly two diseases that can cause stalk rot in zucchini: the first is gummy stem blight. This disease mainly infects zucchini at the stem nodes; the infected area is initially dark brown, then gradually turns black, and the lesion tends to split open, exuding a white gelatinous substance; in the later stage the diseased stem shrivels and splits longitudinally, resembling tangled hemp. The second...
1. Choose disease-resistant, sterile, coated seeds. For uncoated seeds, soak them in warm water at 55°C for 15 minutes, then sprout and sow. 2. Choose fields with high, dry terrain and convenient drainage and irrigation, and adopt high-ridge cultivation to prevent waterlogging in the field and retention of moisture, reducing field humidity, which is an important measure for disease prevention.
3. Strengthen cultivation management, apply fully decomposed organic fertilizer, appropriately increase phosphorus and potassium fertilizer, build up soil fertility, cultivate strong seedlings, and plant at a reasonable density to enhance plant disease resistance; promptly remove diseased branches, leaves, and plants, carry them out of the field and burn them, and apply quicklime to the diseased planting holes for disinfection to reduce disease occurrence.
4. After harvest, thoroughly remove weeds in the field and surrounding areas, and burn them in a centralized manner or compost them; deep plow and sun the soil to reduce sources of disease and pests.
5. Reasonable crop rotation.
6. Chemical control: at the early stage of disease, spray 5% Fangheixing or 10% Duobai dust at 1 kg per mu, for 3-4 consecutive applications.
You can also use 40% metalaxyl-copper wettable powder at 600-700 times dilution, 50% iprodione at 1000 times dilution, 50% Beideli at 500 times dilution, 64% oxadixyl-mancozeb wettable powder at 500 times dilution, 50% carbendazim at 500 times dilution, or 75% chlorothalonil wettable powder at 600 times dilution, spraying once every 7-10 days for 2-3 consecutive applications.
On rainy days, you can use 40% chlorothalonil smoke agent, or 10% resin copper dust, or 5% chlorothalonil dust at 1 kg per mu.