Cineraria is an important winter-spring flower that normally lives in winter in greenhouses. However, due to poor ventilation conditions in the greenhouse and high humidity, coupled with inadequate management, diseases often occur. The symptoms, transmission routes and prevention and treatment methods of common diseases in spring are described below and are for reference only.
First, powdery mildew
Symptoms: Powdery mildew can infect the leaves, branches, buds, and buds of plants. At the beginning of the disease, irregular white round spots appear on the surface of the infested area, and then gradually spread, and black particles are formed. Finally, the round spots are connected together, so that the white powder covers the entire leaf, causing the leaves to distort and roll. Shrink and dry, buds can not open or deformed flowers.
Prevention methods: Increase lighting time, strengthen ventilation, and prohibit spraying. Keep the proper spacing of the plants, timely cut the diseased branches and burn them in a concentrated manner. Reduce the application of nitrogen fertilizer, increase phosphorus and potassium fertilizer. If possible, spray 25% triadimefon wettable particles 1500 times, spray once every 7 days, spray 3-4 times, or use 50% carbendazim 800 times, 70% thiophanate-methyl wettable particles 1000 Alternating liquid spray, once a week, even sprayed 3-4 times, can effectively control the condition.
Second, gray mold
Symptoms: Botrytis cinerea infests the leaves, stems, flowers, and pedicels of cineraria japusi. In the early stages of the disease, there is a water-stained brown patch on the victim's site. In the late onset, when the humidity is high, soft rot appears and there are The gray mold layer, the stem will be folded, the petals, pedicels appear brown soft rot.
Control methods: If possible, spray 50% fast Skeleton wettable particles 1500 times, spray once every 7 days, spray 2-3 times, or spray with 70% thiophanate-methyl wettable particles 1000 times. Spray once every 10 days, even spray 3-4 times.
Third, black spot
Symptoms: Mainly invaded the leaves of cineraria, and in severe cases also infested buds and petals. The onset of disease began with the leaf margins. Black spots appeared in the initial lesions and gradually developed into polygons. They developed toward the upper middle of the leaves and turned grayish black. The outer circle of the lesion shows chlorotic markings. Under high humidity conditions, the lesion will be covered with a layer of black mold.
Control methods: If it happens, spray 70% thiophanate-methyl wettable particles 1000 times or 50% carbendazim wet particles 500 times, spray once every 7 days, spray 2-3 times.
Fourth, white spot disease
Symptoms: mainly infected leaves, mostly in the flowering period, first infected the leaves of the lower part of the plant, the initial stage of the disease was water-streaked small plaques, and then gradually expanded into about 2 cm of round-shaped plaques, the lesions are gray in the center , surrounded by dark brown. In the later stage of the disease, the lesions will expand into irregular plaques. When the humidity is high, the black mold layer will be formed on the surface of the lesions and gradually dry and crack.
Control methods: Appropriate increase in the amount of phosphorus and potassium fertilizers, enhance growth and improve the disease resistance of plants. From the spit color, 70% thiophanate-methyl wettable granules were sprayed at 500 times for prevention and sprayed every 15 days. If there is any disease, 50% Suo Ke-Ling wettable particles can be sprayed at 1000 times, sprayed every 7 days, and sprayed 3-4 times.
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