The serious disease of chrysanthemum is chrysanthemum leaf spot disease. The disease occurs from the lower leaves of the plant, and the diseased spots on the leaves are scattered. At the beginning, it turned green and then turned brown or black. The lesions gradually became round, oval, or irregular. Diameter 2-10 mm, gradually increased, spread from the plant upside down, when severe lesions combined with synthetic films, leaves withered, hanging upside down on the stem, affecting the entire plant. The diseased bacterium is wintered by a conidial device on a diseased plant in a diseased plant or soil, and is transmitted by wind and rain, and the stomata invades. Each year from April to October is the onset period, especially in the hot and humid seasons from May to August. Therefore, management should be strengthened in peacetime. When watering, avoid spraying and wetting the lower leaves. Do not plant too densely, increase ventilation and light transmission. If diseased leaves are found, remove them and destroy them in time. Spray 65% ​​zeocin zinc WP 500 times, or 75% chlorothalonil wettable powder 500 times, or 10%. The Bordeaux mixture is sprayed once every 7-10 days. 3-4 times to control the condition. Or spray 50% thiophanate 1000 times before the onset, or 50% carbendazim 500 times, all have good control effect. The common pests of chrysanthemum are aphids and red spiders. Locusts occur from the start of seedlings to the end of flowering. When the spring worms germinate in the spring, they colonize the stems and leaves and suck the juice. In the fall, it can breed for dozens of generations, damaging buds and petals. Yellow plants were damaged, buds were damaged, and flowering time was shortened. After the aphid was found, 40% omethoate was used for 1500-3000 times, 25% of iminophos-phosphonate was 1000 times, and 50% of the fleshed pine emulsion was 1500 times. Red spiders occur in the high temperature and dry season in summer, lurking on the back of leaves, sucking leaf juice, and making the leaves dry and yellow. Flowering also harms the petals, causing the hair to fade quickly. After the red spider was found to be harmed, 40% omethoate 1000 times, or 80% DDVP 1000 times, or 40% dicofol 1000-1500 times, all had significant effects. In the summer high temperature and dry season, commonly used water spray also has certain prevention and treatment effect. China Agricultural Network Editor
Jasmine Tea,Tea Leaf,Jasmine Tea Pregnancy,Jasmine Tea House
GSDGA , http://www.nbblacktea.com