With the adjustment of the planting structure of corn, the major pests and diseases, farmers, black tigers, golden turtles, aphids, root rot, and virus diseases that trouble farmers have been encountered in production. First, harm the symptoms 1. Thistle is the larva of chafer, commonly known as "white silkworm". For omnivorous pests, larvae can bite off the roots and stems of mung beans, causing the seedlings to wither and die, resulting in the lack of seedlings and ridges. Adults can take leaves. 2, small tigers. Commonly known as cutworm, silkworm, food mixed. Young larvae often cluster on the heart's leaves or on the back of leaves, often eating the leaves into a mesh shape. After the third instar larvae bite the seedlings from near the ground, dragging them into the hole, and the upper leaves are exposed. Outside the hole, the lack of seedlings was caused by the lack of ridges. 3, black velvet beetles. After the adult is unearthed, it damages the seedlings and begins to feed on the cotyledons. After the insects bite, the leaves and leaves become nicked and even eaten. 4, locusts. Gathered in the mung bean's tender stems, buds, the top heart leaves on the back of the tender leaves, flower organs and tender pods to draw juice. After the mung bean was damaged, the leaves curled and the plants were dwarf, affecting flowering and fruiting. Generally can reduce production by 20% to 30%, weighted up to 50% to 60%. 5, root rot. 10 to 20 days after the emergence of heavier, can continue until flowering. In the early stage of disease, the stem base of the seedlings develops a red-brown to dark brown lesion, and the cortex is dehiscent and ulcerated. In severe cases, the lesion gradually expands and surrounds the entire stem, resulting in browning, depression, contracture, and collapse of the base of the stem. 6, virus disease. After the mung bean is infected with virus in the field, the symptoms are the shrinkage of the flowers and leaves, the dwarfing of the plants, and the number of locusts in the field. II. Integrated prevention and control techniques 1. Strengthen field management, deep plowing after the fall, and application of mature farmyard fertilizers. Potash fertilizer, reasonable rotation. 2, before the broadcast seed dressing, the use of pharmaceutical combination coating can effectively control the above four worms and root rot. Coated pharmaceutical composition: 70% thiamethoxam seed treatment dispersible powder + 70% imidacloprid seed treatment dispersible powder + 35% fluoxetilnitrile metalaxyl suspension seed coating agent + 6% tebuconazole suspension seed coating agent.
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