At present, it has entered the rainy season, and the amount of rainwater has started to increase. This year, the temperature is higher than normal, which is very beneficial to the occurrence of corn borer, and prevention and control work should be done in time.
Corn borer, commonly known as corn borer, mainly harms corn and also harms crops such as rice, cotton, and pepper. Larvae eat corn stems, fruits and foraging leaves damage. The newly hatched larvae fed the leaves and leaves to make the leaves translucent. After 3 to 4 years of age, the hard tissues of the leaves were taken, and the severely damaged plants could not be properly extracted. At the booting stage, the tassels that are not extracted are harmed; after the tassels are invaded, most larvae invade the tassels and stalks above the ear, causing the culms to break off. When larvae start to go silking, larvae concentrate on filaments, some of the older larvae migrate downwards, and they invade the stalks and stem segments, which seriously affect the development of the ear and grain filling.
Corn borers occur 1 to 7 generations a year. The last mature larvae lived in the host stalks, cobs or root pods throughout the winter. Adults live in ecstasy and have phototaxis, generally spawning around 1st week after and after silking, and the eggs are produced on both sides of the dorsal veins. After hatching, the larvae dived into the heart of the leaves, or drooped on the winds, and moved to the neighboring plants with the wind. The damaged plants were often connected together. High temperature and high humidity conditions are favorable for the occurrence of corn borer.
In the corn leaf stage, corn borer is used to control the field where the mosaic rate reaches 10%, and it is applied in the final stage of the heart leaf stage. If the flower leaf rate is lower than 10%, it can be treated as appropriate; the mosaic rate exceeds 20% or the egg mass exceeds 100 Thirty ones were controlled once in the middle leaf stage and end stage leaf stage. In general, each plant uses 1.5% phoxim granules or 0.4% of enemy-killing granules 1 to 2 grams into the heart; or 90% crystals of trichlorfon per acre 50 grams or 50% of dichlorvos EC 50 ml, add water 40 to 50 kilograms. Maize tassels at corn ear stage: 10% of the ear rate or 50 plots of insects with silkworms in the field of silkworms; control of the use of drugs during the prolonged period of silk drawing; rate of ear ear exceeding 30%, 6 to 6 days after treatment Remedy once in 8 days. The medicament can be applied to any of the above-mentioned medicaments by spraying it on the filaments of the corn and the leaves of the two leaves on the upper and lower sides. Severe damage to the cut filigree, wipe a layer of mud at the top of the spike, the mud with 90% crystal trichlorfon 50 grams of water 15 kg dissolved, add 27 kg of clay transferred to mud.
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