Major pests and diseases Corn borer â–² also known as corn borer, larvae damage. The larvae develop to four to five instars and begin to migrate downwards, invading the stems or ears. When the leaves are harmed, there will be neat rows of holes after unfolding; when the stems are damaged, the folding stalks, lodging or redness of the upper part will be caused; when the ear of the cockroach is affected, the grouting will be affected. Adults are yellowish brown, 12-15 mm long, and both front and rear wings are traversed by two distinct light brown wavy patterns with two dark spots in between. Corn brown spot â–² Occurred mainly on the leaves, leaf sheaths and stems of maize. Lesions were most common at the junction of leaves and leaf sheaths; larger brown spots appeared on leaf sheaths and veins; lesions of epidermis ruptured at the late stage of disease; And vascular bundles remain as filamentous. The lesions on the stem often occur near the section. Corn spot It mainly damages the leaves, and also seriously damages the leaf sheaths and temporal lobes. It begins with the lower leaves of the plant and expands upward. In severe cases, several lesions are connected together, resulting in large dead spots leading to leaf scorch. Rainy and wet weather, dense gray mold layer can be densely stained. In disease-resistant varieties, lesions spread along the veins, showing brown necrotic streak, surrounded by yellow or light brown chlorotic circles. Brown-footed Horn Chest â–²Brown-footed chest Chestnuts are mainly brown in the city, accounting for approximately 95% of the total insect population. The brown-footed horned horned beetle A is an adult larvae, and its adult genus is a limping insect, and its activity peaks before and after 6:00. Adults feed on the upper middle leaves or heart of corn to form mesh holes. When the amount of insects is high, the leaves can be eaten and the veins remain, resulting in loss of yield. Prevention The corn borer releases the caterpillars Trichogramma chinensis during the spawning period of adults, and releases it 1-2 times throughout the growing season, releasing 10,000 to 20,000 heads per acre. In addition, Bacillus thuringiensis (Bt) preparations can also be sprayed at the end of the heart blade for control. The severely severed plot of Xiaoyajiao, a brown-footed horn, can be sprayed with water in the early morning after the dew has evaporated or in the evening. Considering its high activity, the agents must select insecticides such as beta-cypermethrin, deltamethrin and phoxim that have contact and stomach toxicity. Maize large, small spot, brown spot timely fertilizer, improve plant resistance to disease. Chemical control promotes proper use of early medication. At the end of the corn leaf stage (brown spot in the corn 8-10 leaf stage), spraying of difenoconazole, diniconazole, pyraclostrobin, Jinggangmycin A and other agents Depending on the onset of the disease, it should be sprayed once every 7-10 days. Mixing with brassinolide can improve the efficacy and reduce the dosage.
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