Symptoms: mainly damage the leaves and buds. Leaf primary yellowish spots, enlarged large oval spots, dark brown edges, surrounded by yellow halos around the spot, the center from the brown to gray and white, humidity, lesions and leaves similar, sometimes several lesions sink Synthesize more than 10 centimeters long concave wards, affect the growth of buds and the formation of flower buds, or cause buds to break and die.

Pathogen: The pathogen is a fungus, Chinese name: Fusarium concolor Reink, a subgenus of the fungus. Bacteria produce two types of conidia and chlamydospore. Large conidiophores sickle-shaped, colorless, slightly straight or curved, with 3-5 septa, mostly 3, size 24-773.2-5.5 microns. Small conidia cells, ovoid, occur less frequently. Chlamydospore globose, 1-2 cells, metaplastic or terminal, smooth or slightly wrinkling, size 7-157-11 microns. The optimum temperature for germination is 15-20°C, with a maximum of 35°C and a minimum of 8°C. In addition to lily, it also causes root rot in broad beans.

Incidence of disease: Mainly mycelium or conidia overwintering on the dead leaves of autumn seedlings, the next spring conditions are appropriate, spores germinate, produce buds, invade leaves or seedlings, after 3 days of latent gyre, manifestation of disease, Six to seven days after the onset of symptoms, the diseased part again produces conidia and reinfection. After the death of spring day lily, the germs can enter the autumn infested autumn seedlings over the dead leaves and flower buds. Partial application of nitrogen fertilizer, leaves growing soft, heavy soil, the management of extensive disease severity.

Control methods:

(1) Selection of disease-resistant varieties.

(2) Reasonable fertilization, good cultivation of autumn seedlings, enhancement of disease resistance, rapid cutting of seedlings after picking yellow flowers, timely clearing of the diseased body of autumn Miaotian, concentrated burning or deep burial, when the spring leaves a large number of new leaves, topdressing nitrogen fertilizer Don't overdo it, and pay attention to update your old man.

(3) Spray 50% carbendazim WP 1500x, 70% thiophanate-methyl WP 500x, or 75% chlorothalonil WP 500x, 60% anti-mildew Po Superfine 600 times liquid, once every 7-10 days, continuous control 2-3 times, the above-mentioned agents should pay attention to alternation or rotation use or mixed use, in order to improve the control effect, delay drug resistance.

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