Control method for marigold gray mold

Symptoms: damage the petals, leaves and stems. Petals and flower stalks are susceptible to disease when they begin to age. The affected part is brownish and rotten. It produces a large number of mycelium and makes petals stick to each other. When the humidity is high, a large number of conidia are infested and grayish or light brown spider silks appear. The mold layer fills or covers the inflorescence and then spreads to the pedicel to cause rot, causing budding and diseased flowers to droop. Stems and petioles infected, often with spots or dark brown spots, when the entire petiole infestation, after rain or humidity, the disease is covered by the spores of Botrytis cinerea, when the tissue decays, the epidermis dehiscent, the disease tissue shrinkage , Black or flat sclerotia on the surface or inside. When the leaves were infected, watery spots appeared in the diseased part, the diseased tissue turned brown or dark brown rot, and when the humidity was high, a large amount of gray mycelium grew.

Disease characteristics: The disease is a disease caused by a fungus. Pathogens have a sexual state called Fuker Sclerotinia septicum, anamorphous state called Botrytis cinerea. The pathogenic bacteria live over the soil in infected plants, rotted debris, or with sclerotia. The disease is a low-temperature, high-humidity disease, which occurs more often than early spring, late autumn or winter in low-temperature and high-humidity conditions. In the days of continuous cloudy weather and humid climate, gray mold begins to occur. The disease is particularly paralyzed at low soil temperatures or poorly ventilated plants.

Control methods:

(1) Horticultural control: enhance plant resistance to disease; timely drainage after rain, prevent moisture retention.

(2) Chemical control: Preventive control should be carried out in case of pandemic climatic conditions. Before the onset of the rainy season or early onset of the disease, the drug can be sprayed with 50% acetaminophen WP 1000 times, 50% sucrose. Spirit WP 1500 times, 65% Tamycin WP 1000 times, 25% BP 100 times, 50% LM WP 800 times, 40% more .Moxvi WP 1000 times, 40% Scarlet suspension 1200 times, 28% gray mold WP 600 times, 30% intensive water suspension 900 times. Spray once every 10 days or so, control 1 or 2 times.

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