Maize seedling stage is a period when various diseases and insect pests are mixed. The main diseases and pests are corn stem rot, thrips, armyworms, and small tigers. If they do not do a good job of prevention and control, they will have a big impact on the growth and yield of corn.
Stem base rot Stem rot in maize mainly damages the roots and stem base of the corn. The pathogens invade from the root system and spread and expand in the plant body. Lights generally cause browning of the xylem at the base of roots and stems, severe root and secondary root necrosis, rot in stem bases and roots, causing lodging or whole plant death. The above-ground parts showed yellowing and browning of the edges of the lower middle leaves, and severe yellowing of the whole plant.
Seedling Insect Pests Thrips: Thrips are the major insect pests in maize seedlings. Adults and larvae are more harmful in the young parts of the corn, and the heart is more serious. After the corn was killed, the light leaves were distorted and broken, and those who were severely damaged caused the heart and leaves of corn to deliver, and they could not make it later. Thresholds of thrips are concentrated from mid-June to early July, and adult larvae often overlap in the fields. Maize seedlings just coincided with the occurrence of damage to the thrips. Therefore, we must pay close attention to prevention and treatment in due course. Mythimna separata is an explosive pest that migrates long distances. The second-generation larvae cause obvious damage in the corn seedling stage. The light leaves are eaten as missing trees, and the whole ones are eaten as food, resulting in the lack of seedlings and ridges, which is extremely damaging. Small tigers: In recent years, the larvae of the young tigers have been afflicted with heavier damage, and they are generally more harmful to spring and summer sowing crops. The larvae mainly damage the stem bases and roots of the crops, and bite off the stem bases or roots, causing seedlings to die, affecting the crop yields. Small tiger is a kind of migratory pest that can harm corn, beans, peanuts and other autumn crops. It should do a good job of prevention and control.
Control methods Maize stem rot can be used to kill 15 to 20 grams of water with the use of Guanyin to control 30 kg of water spray; Puma, armyworm, small tiger can be used to control the net with jade insects.
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