The leaf-use pods planted in Guangdong and Guangxi Provinces often have a leaf spot disease during the high-temperature and rainy seasons in summer, and cause leaf yellowing and falling off in severe cases, affecting the yield and quality of alfalfa. After inspection and identification, this is a gray spot disease caused by Verticillium sp.
The disease mainly damages the leaves of aphids and also harms the fruits. At the beginning of the disease, the leaves became round or near-circular lesions, with a diameter of 2-4 mm. The lesions were brown on the edges and gray in the center. The back often grew black moldy material. The discoloration of leaves around the lesions turned yellow and gradually developed into yellowing of the whole leaf. Fruit lesions also appeared similar to lesions, causing fruit drop.
The leek can be planted in the Canton-Guangzhou area for an anniversary, and the germs did not overwinter. Disease spores with diseased foliage and diseased fruits in the soil in the field are the main source of primary infection, and seed-retaining cuttings often spread with disease. The spores of pathogens can also spread and spread around with wind and rain. In hot and rainy seasons, humid air and high soil moisture are conducive to the disease. Planting is too dense and the soil lacks fertilizer. When the plants grow weak, the disease becomes more serious.
The following measures should be taken to prevent gray spot disease:
1. Clean the pastoral areas, remove the diseased leaves and diseased fruits, and concentrate deeply or burn them to reduce the source of the disease.
2, pay attention to the selection of disease-resistant varieties, in the disease-free plants cutting cuttings cutting seedlings. The cuttings can be soaked in 1% bleach water for 10 minutes, rinsed with clean water and then planted.
3, leek needs a large amount of fertilizer, apply organic base fertilizer before planting. When growing vigorously, pay attention to timely topdressing, increase phosphorus and potassium fertilizers, increase resistance to disease, and strengthen field management, appropriate sparse shearing to prevent overcrowding and increase inter-strain permeability.
4, susceptible to disease infection and early onset of the disease can be used: Dashuangning (75% chlorothalonil WP) 700-800 times, 100 times (75% wettable powder) 500 times, Wei Wei (40% suspension Agent) 400 times, the amount of new high-fat film, spray once every 7-10 days to prevent disease.
5, plants have been infected, and the climatic conditions are conducive to the occurrence of diseases, the following agents can be used to treat: Eupatorium (70% wettable powder) 700-800 times, myclobutanil (125% Emulsion) 1000-1200 times, bacteria Standing off (15% thimycorbate water emulsion) 800 times, anti-mildew Thai (65% wettable powder) 700-800 times. Spray once every 5-7 days for 2-3 consecutive times. (China Plant Protection Network: Wei Linfei)
Spathe carnation (Dianthus barbatus l.) also known as sweet John kam and colorful carnations, ten samples, caryophyllaceae perennial herbs, 30-60 cm tall, erect stems, leaf blade lanceolate, spend majority, integrated heads, petals have long nails, disc ovate, usually red, purple with white stripes, capsule ovoid, oblong, seeds brown, flat oval, and 5-10 months.Must be bract carnation originated from Europe, now our country cultivated for ornament.Must be bract carnation hardy and not resistant to heat, like the sun, high and dry, ventilation, and well drained rich loam.Must be bract carnations can be used in flower beds, flower in the garden, flower terraces or potted, also can be used for rock gardens and the edge of the lawn ornament.
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