Blight: Also known as seedling damping-off, it often occurs when seedlings grow 1 to 2 leaves. The stem near the soil surface at the time of onset was rotten or puckered with a pale yellowish brown, resulting in lodging on the ground and the disease rapidly developing. Control methods: 1 Use 70% pentachloronitrobenzene powder to treat soil, soak seeds, or water the wards. Treatment of soil 667 square meters of medication 1 to 1.5 kg, evenly mixed in the soil before sowing; soaking with 500 times the liquid soaked for 10 minutes; irrigated with 200 times liquid, wet soil deep 5 cm. 2 Spray with 50% thiophanate-methyl wettable powder 800 to 1000 times.
Black stem disease: also known as bacterial wilt, occurs in July-August high temperature and rainy season. In the stem close to the ground, there are long dark spots, which expand up and down, making the stems thin and thin, yellow-green leaves, sagging leaves, edges inward roll. The internal tissues of the stems were darkened in the cut-away view, and the entire plant was withered when severe. Control methods: Strengthen field management, increase phosphorus and potash fertilizers, and eliminate water in a timely manner.
Pelicans and small tigers: These two types of underground pests can bite off seedlings and cause dead seedlings; crickets also drill many tunnels in the seedbed soil, injuring the roots and causing dead seedlings. Common damage during nursery and during planting. Control methods: 1 The applied manure should be fully decomposed, preferably high-temperature composting. 2 Light traps and kills adults, that is, they use a black light, a lantern, or an electric light to seduce them in the field. A container of insects is placed under the lamp, and an appropriate amount of water is placed in the water. A small amount of kerosene can be added to the water. 3 During the field period, use 90% trichlorfon 1000 times or 75% phoxim EC 700 times. 4 poison bait trapping, with 25 grams of chlordane EC mixed bran 5 kg of wheat bran plus appropriate amount of water dubbed bait, spread in the field in the evening or in the face trapping. For cockroaches, poison baits can also be trapped at the entrance of the tunnel.
Tiger moth: In September-October, the larvae eat the leaves and bite into holes or nicks. The larvae have brown, tan or dark brown hairs, commonly known as caterpillars. The damage period can be sprayed with 90% crystal trichlorfon 1000 times.
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