Key points for comprehensive prevention and control of pests and diseases in the middle and late stages of pollution-free summer maize
With the development of the market economy, the requirements for corn production are getting higher and higher, not only requiring high yield, but also requiring high quality and pollution-free. Therefore, in the production of summer corn, especially in the prevention and control of pests and diseases, we must conscientiously implement the principle of “prevention first, comprehensive prevention and controlâ€, adopt comprehensive prevention and control measures combining agricultural control, biological control and chemical prevention, strictly in accordance with pollution-free corn. Production standard scientific selection of drugs, rational use of drugs to ensure pollution-free production.
Disease. Prevention and treatment of large corn leaf spot and small leaf spot disease: In recent years, large and small leaf spot disease of corn has occurred extensively, which seriously affects photosynthesis of maize. It is now a critical period for the occurrence of this disease, and we must pay close attention to prevention and treatment. Control method: spray 75% of mancozeb or 500~800 times of enemy acre in the initial stage of the disease, spray once every 7~10 days, and spray 2~3 times. Corn bacterial wilt: The disease mainly occurs when the air humidity is high, especially after a sudden rainstorm. Control method: When the diseased plant rate reaches 10%, use 20% triadimefon or 50% carbendazim 500 times solution, and 0.1 kg per plant.
Pests. Control of sticky insects: also known as cottonworms, five-color insects and so on. In the general year, 4 to 5 generations occur, and the second and third generations are more harmful to corn. The prevention and control index of the three generations of sticky worms is 120 seedlings of live corn and 150 heads of 100 kinds of corn, which can be sprayed with 25% of chlorfenapyr 1 and 10 ml of water per acre. The spraying time should be earlier than other chemical pesticides. For 2~3 days, or spray Bt biocide (containing 10 billion live spores per gram) of wettable powder of 250~300 grams per acre. It can also be controlled by trapping adult worms and collecting egg masses. Corn borer: also known as borer. It usually takes 3 generations a year. Adults are concealed during the day, nighttime activities, and phototaxis. Control method: When the leaf rate of the heart leaf stage reaches 10%, use 50% crystal trichlorfon or 2.5% deltamethrin EC 20~40 ml to fill or spray 50 kg of water, or 0.5 kg white per acre. Sterile powder, 0.3 kg of Bt bio-insecticide, mix well with 5 kg of sand, sprinkle in the bell mouth, about 2 grams per plant. Corn ear worm: occurs at the heading stage. Control method: When the corn plant reaches 30 heads, 80% dichlorvos EC can be used for 1500 times droplets of filaments, 2~3 drops per ear, or after pollination, cut the top filaments and stems and leaves, drip irrigation 90% crystal enemy hundred Insect 800 times liquid. Corn borer: Aphids not only harm the growth of corn but also spread viral diseases, and must be prevented in time. Control method: use 50% anti-Converse wettable powder 10~18g or 25% imidacloprid wettable powder 20~40g per acre, 50kg of water, spray on corn ears.
The timely removal of weed to grow corn in the late, closed herbicide efficacy has disappeared, weed began to breed, not only with corn fight fat competition for water, but also easy to induce a variety of diseases and pests to breed, must be promptly removed.
In short, for the prevention and control corn pests and diseases, we must make full use of a variety of methods, strict control of drug concentration, dosage and frequency of administration, to ensure that high-yielding corn, high-quality, pollution-free.
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