Major Diseases and Control of Orchids
Anthracnose is an important orchid disease. At the early stage of disease, the leaves developed round and dark brown lesions. Afterwards, the edges gradually darkened, and the center was grayish brown. The lesions were easily disintegrated. In severe cases, the lesions are numerous and the leaves are yellow. Prevention and control measures: 1 cut off diseased leaves, remove diseased bodies, and concentrate burning; 2 pay attention to ventilation and light transmission; 3 cultivate robust plants, reduce incidence, prevent over-watering, especially avoid water directly sprayed plants; 4 diseased plants available 50% benzene To special or 70% thiophanate or 50% carbendazim 600-800 times spray, once every 10 days, even spray 3-4 times, control effect is quite good. Orchid round spot disease, also known as leaf blight. The bacteria invaded the leaves and began to have small dots of reddish-brown color, rapidly expanding into semicircular or round dark brown spots. When there are many leaf spot changes, the leaf tissue between the lesions will become green and yellow. Control measures: 1 Remove diseased leaves. 2 In the growing season of the plants, spraying with 1:1:100 Bordeaux mixture, 70% chlorothalonil 500 times, 50% trehalose 800 times or 65% zeocin 500 times. Orchid whitefly disease is a fungal disease. At the beginning, the brown base rots near the soil at the base of the orchid, and white silkworms are soon produced, spreading on the surface of the rhizosphere, and finally causing the entire leaf cluster to die. Occurred in the high temperature and rainy season. Control measures: 1 remove diseased plants; 2 pay attention to ventilation; 3 0.2% pentachloronitrobenzene basal weight disinfection, mixing and uniform after planting; 4 pairs of plants available chloronitrobenzene powder 50 grams and diseased plants Semi-dry semi-wet fine soil 3-5 kg ​​mix, spread the medicine in the rhizome of the plant. Orchid ring blotch virus can infect Jian Lan, produce mosaics, and green ring spots. Prevention and control measures: 1 Remove diseased plants, no sick plants to reproduce new strains, disease areas should try to cultivate disease-free seedlings; 2 orchid management (separation of roots or pots, etc.) in the process, try to reduce damage to the leaves to prevent juice friction infection. Orchid necrotic spot disease is a virus disease. The virus spreads through juices, peach pods and other channels. Green spots and necrotic spots are produced on Jianlan; local necrotic spots are found on Catalans; mosaics are produced in trees and orchids; control measures are taken; 1 seed propagation is used to eliminate virus transmission; 2 rational fertilization promotes plant robustness and reduces disease; 3 Plants were sprayed with insecticide to exterminate locust, 40% dimethoate 1000 times, 50% marathon 800 times, and 75% phoxim 1000 times. Orchid rot is a bacterial disease. Occurred mainly on the axillary buds. It initially appeared as a spot of water-stained mung beans at the base of the buds. It later became dark green scald-like plaques, which extended to the outside of the coleoptiles and showed dark brown rot. Diseased leaves were easily pulled out. Control measures: 1 Control of soil moisture content, sick potted plants should stop watering, watering until the disease is controlled; 2 when the new shoots are unearthed 4-5 centimeters, with 0.01% boric acid solution or kill the net spray have a certain effect, Streptomycin can also be used for prevention and treatment. Phytophthora sclerotiorum in orchids was first rotted on the base of the leaf, and then extended to the whole leaf. It turned reddish-brown and caused the blue leaves to die. Prevention and control can be removed diseased plants, with reference to the prevention and treatment of white peony disease. Phytophthora infestans form brown round or oblong necrotic spots on the leaves of orchid virus, and then expand into large spots. The leaves are easy to brown, and the disease is often burned and destroyed.
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