Main pest control methods for corn:
1, the main pests are corn borers and locusts, etc.
Corn mash can cause corn mosaics, drill collars, damage to the ears and tassels. The prevention and control of corn borer should be controlled at the end of the heart and leaves, using the "three fingers and one tactic" method, with 1.5% phoxim granules in the amount of 1.5-2 kg per acre to lose heart, control effect is obvious. It is also possible to use 1000-fold solutions of pyrethroid pesticides in water or 1000-fold solutions of 50% phoxim emulsion. The nozzles of the atomizers are removed and the chemicals are sprayed into the foliage. For tadpoles, tasselling and shearing can reduce the damage to a certain extent, and can also use 40% dimethoate EC or 10% imidacloprid 1000 times spray control
2, the main diseases are: sheath blight, smut, and large and small spot
The incidence of sheath blight was mainly on leaf sheaths and ears, followed by stems. After the onset of the leaves, the first light brown patches were sometimes water-stained. The disease started from the base sheath and gradually developed towards the upper part of the plant. When the disease developed into the ear, a moire-like large plaque was also formed on the ear of the ear. Soon, the upper stems and leaves will all die, and the whole ear will shrink afterwards. Maize big spot disease occurs in the late growth stage and mainly damages the leaves. The lesions are large and small, and when severe, the field is full of yellow. Corn leaf spot can occur throughout the growing period, harming leaves, leaf sheaths, and temporal lobes. Corn smut causes ash packs in the affected area and it is covered with a grayish white film. After the film breaks, dark brown powder is emitted and it is contagious.
Control methods: Control of smut, can be used 25% triadimefon 150 grams of wettable powder, add 50 kg of seeds to prevent seed dressing. If plants in the field are found to have smut, remove them in case of emergency. In the initial stage of leaf spot disease, the lower 2-3 diseased leaves are promptly removed; 70% mancozeb WP can be used 400-500 times, 70% thiophanate-methyl or 50% carbendazim WP 500- 800 times liquid spray to prevent sheath blight and leaf spot.
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