Pepper spring and spring seedlings often show leaf curling, stagnation, and even death.
I. Causes and Symptoms
(1) Physiological diseases: The long-term low temperature and high humidity of the seedbed will cause poor plant growth, yellowing of stems and leaves, curling of the parietal lobe, and slow growth. The severe roots will die and the roots will become rust-colored and then rot. (2) Viral disease: Virus disease in greenhouses occurs in all seasons. The parietal lobe of the diseased plant is shrunken and bent into a fern leaf shape. (3) Tea hazard: The leaf margins of young leaves are rolled down, and the back surface is brownish-stained. In severe cases, the apical buds are dry. (4) Locust damage: The initial leaf curls and deforms, and then the insect-feces contaminate and the leaves are covered with oil stains and become black.
Second, prevention and control measures
1, exclude the low temperature and high humidity: Let the sun shine in full, even the low temperature weather, increase the heating facilities. After the seedlings are not ventilated, keep the seedbed temperature at 25-30°C during the day and 18-20°C at night. In case of high temperature at noon, it can cover the shade of grass and leaves the seedbed heated evenly; at night, the temperature is too low, and it can be covered with straw and straw. After easing the seedlings, the temperature was reduced by 3-5°C overnight, and the seedbed was sown with haywood ash or fine dry soil to absorb moisture and heat. Foliar application of 500 times photosynthetic fertilizer or potassium dihydrogen phosphate, urea mixture to promote its growth. For the young seedlings, the gibberellin solution with a concentration of 15 mg/kg can be sprayed to promote its sprouting.
2. Prevention and cure of virus diseases: Spray 20% virus A, sprayed Po solution mixture (50 kg of water plus virus A100 g, sprayed with 5 ml) or 5% of Bacteria toxin 300 times or 1.5% plant Elixir 800 times solution, once in 7 days, even spray 3-4 times.
3, to kill the tea aphid: spraying the back of the leaves 15% Dai Ling EC 300 times, or 20% chloric sterol 800 times, or 20% swop 2000 times.
4. Locust control: Spray 2.5% Uranus or 50% anti-inverse 2000 times liquid.
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