Melon Wilt
The melon wilt blight is also known as the disease. Plant diseases caused by fungi or bacteria, sudden onset, symptoms include severe spotting, withering or death of leaves, flowers, fruit, stems or whole plants. The young tissues of fast-growing melons are often attacked. Most important melons are infected with one or more diseases. The disease can affect the melon's flowers, leaves, bud bags, seedlings, twigs, stems (vines) and tip.
Symptoms of injury: At the early stage of disease, the leaves of the plants gradually wilted from the base to the top, apparently at noon, and recovered sooner or later. After several days, all the leaves of the plants wilted and drooped, and no longer recovered; the stems of the stems were slightly contracted, the epidermis was rough, and there was often longitudinal cracks. When the moisture is moist, the rhizomes are watery and rot, and the surface often produces white or pink mold. The roots of diseased plants turn brown and easy to pull up. The cortex and xylem are easily stripped and the vascular bundle becomes brown. The peak of onset occurs from flowering to fruit setting.
Transmission route: melon wilt stem disease stem 100%, seeds are also carriers. The disease is caused by the mycelia and chlamydospores and sclerotia of diseased stems, seeds or diseased bodies in the soil and in the uncontaminated organic fertilized manure, and has become the source of infestation in early winter. In the soil, the bacteria invade from the root wound or root apical cell, and then enters the vascular bundle, develops in the catheter, and passes through the catheter, extending from the diseased stem to the fruit stem, reaching the fruit, and spreading to the seed as the fruit rots, causing the seed With bacteria. Seeds bearing fungus on the production can be infected after emergence; large and small conidia propagated in vascular bundles block catheters and secrete toxins, causing poisoning of the host and making the melon leaves wilting rapidly. Repeated infestations on the ground are mainly wounds caused by pruning or binding. The severity of the disease depends mainly on the amount of infection that year. High temperature is conducive to the occurrence and expansion of the disease, air relative humidity more than 90% susceptible to disease.
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