Preventing two diseases of greenhouse cucumber
Affected by the recent hazy weather, cucumbers in the greenhouse have downy mildew and gray mold. The rate of cucumber downy mildew strains on individual plots reached 100%, and the gray mold disease went up to the cucumber strips. In the initial stage of pests and diseases, effective chemical control measures should be taken to control the disease so as to extend the period of melon harvesting and achieve the purpose of increasing production and income. Downy mildew Symptoms: Downy mildew only damages the leaves. After the seedlings are unearthed, the cotyledons can become infected, and irregular spots with greenish irregularities appear, which turn yellowish-brown. The leaves are infected with diseased spots with irregular water spots on the leaf margins or leaves. With the development of the disease, the lesions are expanding, due to the limitation of the veins, they are polygonal yellow-brown lesions, and when the skin is wet, there is a purplish black mold layer on the back. It generally spreads upward from the lower leaves, and when the disease is severe, the lesions are linked to each other and the diseased leaves die. Control methods: 72.2% Preclo 800X, or 58% Ledomil WP 500 times, or 64% WP WP 400 times, spray every 7-10 days , even against 2-3 times. To reduce the humidity in the greenhouse in the near future, 45% of chlorothalonil aerosol can be used, 250 grams per acre, 4-5 points in the shed, ignited in darkness, smoked in closed sheds for one night, or 5% of chlorothalonil dust per hour. 1,000 grams of mu, closed the night, in the morning, once every 7 days. Grey mold Symptoms: mainly damage the young melon, leaves, stems and so on. Leaf disease, mostly from the margin of the leaf, showing a "V" shape extending into the leaf, the Minister of the disease out of the gray mold layer; bacteria from the invasive female flowers invade, resulting in petal rotten, and the emergence of gray mold layer, extended to the young melon Rotten melon. Diseased melon surface with gray mold layer. Rotten melon or burnt-out, detached to the leaf blade to cause foliar disease to form a round or irregular shape lesions, obvious edges, a small amount of gray mold on the surface, burnt or rotten melons attached to the stem, causing stem disease, serious When the vines are broken, the plants die. Control methods: In the flowering stage, add 0.1% of 50% procymidone or 50% iprodione to the female flower after adding 0.1% of anthracycline. In the early stage of disease, use 10% fast-keratin smoke agent 250 grams per mu, or 45% chlorothalonil smoke agent 250 grams per mu, sealed smoked shed overnight; or use 50% acetaminophen 1000-1500 times fluid, 20% Pyrimethanil 600 times, 40% Shijiale 1000 times spray control, once every 7 days, even 2-3 times. Blood Pressure Machine,Blood Pressure Cuff,Best Blood Pressure Monitor,Wrist Blood Pressure Monitor K-MED Co., Ltd. , https://www.kmedasia.com