tulip rot sclerotinia
Tulip rot Sclerotinia sclerotiorum, the pathogen belongs to semi-known Sclerotinia sclerotiorum, mainly harms seedlings and bulbs. After the seedlings were infected, the leaflets withered as soon as they were pulled out. The bulbs were damaged, the outer scales were soft rotted, and many white silk-like hyphae appeared in the diseased part and the surrounding soil, and then many rapeseed sclerotia were formed. After the formation of many sclerotia, the sclerotia was white at first, and then turned brown.
The law of the disease depends on the transmission of mycelium and sclerotia. The sclerotia overwintered in the soil. Under the condition of high temperature and humidity, the disease occurred seriously.
Prevention and cure
A, when collecting, remove the diseased bulbs.
B. The storeroom should be ventilated and the temperature should be kept below 20 ℃.
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Control of Brown spot of Tulip
Symptoms: the infected leaf buds are malformed and curled, and the leaves that grow up after the tender buds are damaged become curly. If the environment is humid, a large number of gray mold conidia will be produced on the diseased tissue, which will affect the nearby healthy plants and make the leaves susceptible, so the growth of the bulb will be greatly affected. After the flowers are injured, white or light yellowish brown spots begin to appear, then expand rapidly and wither, or turn brown and dry. Banding also appears on the pedicel, and the conidium sometimes occurs above it. At every stage of the disease
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Tulip Pythium root rot
The disease can be caused by ultimate Pythium, abnormal female Pythium and intermediate Pythium, all of which are caused by oomycetes. The pathogen overwinters in the diseased bulbs, diseased roots and soil, and often spreads with the movement of the diseased soil. The soil temperature is high, the drainage is not timely after rain, and the moisture retention time is long. Symptoms: at the beginning of the disease, translucent water stains appeared in the roots, which caused browning of vascular bundles and root rot. After the bulb is infected, gray spots appear around the base of the bulb, and the edges are brown. In severe cases, the bulb is soft rotten, and diseased scales are planted.
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