Corn ear rot is one of the important diseases in the late growth stage of corn. It occurs in different degrees in various corn producing areas. The disease spreads rapidly and the damage is serious, resulting in reduced yield and quality of corn.
Corn ear rot is caused by a variety of pathogens, mainly caused by nearly 20 kinds of molds such as Fusarium graminearum, Fusarium oxysporum, Penicillium, Aspergillus, Cladosporium, and Trichophyton. Aspergillus flavus in Aspergillus also produces toxic metabolites during growth. If infected corn is used as food or feed, it is easy to cause poisoning of humans and livestock and poultry.
Symptoms mainly occur on the ear, the top or middle of the damaged ear is discolored, the large piece or the whole ear is rotted, the diseased grain is shrunk, dull, not full, and there are pink, blue-green, dark gray or dark brown, yellow-brown mold layer. , that is, mycelial conidiophores and conidia of pathogenic bacteria. Some symptoms only appear on individual or local granules. Sometimes there are pink or gray-white mycelium between the grains, which are densely colored with red powder, the disease is crisp and the inside is empty and easily broken. The loquat leaves of the ear disease department are often penetrated by dense hyphae, and stick together on the ear and are not easily peeled off.
The prevention and control technology is sprayed with 50% carbendazim WP or 50% thiophanate-methyl WP 1000 times, and 50 kg per acre. Focus on the ear and the lower stem and leaves. Spray every 7 days. Times. In the early stage of the disease, spray 5% Jinggangmycin water to the ear, 50~75 ml per acre, 75~100 kg of water or use 700% carbendazim suspension 700~800 times solution, 50% benomyl wettability Powder 1500 times liquid spray. According to the condition, prevention and treatment 1 or 2 times.
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