The larvae of the wheat armyworm primarily feed on wheat, rice, millet, and corn, as well as other cereal crops. In large infestations, they can also damage beans, vegetables, and cotton by feeding on their leaves. This pest is known for its destructive behavior, especially during outbreaks when it can cause significant crop losses.
To manage the wheat armyworm, one effective method is to use adult moths to lay eggs on the leaves of cereal crops. Farmers can insert straw or grass into the wheat fields, covering an area of 60 to 100 acres, and replace the grass every five days, burning the removed material to reduce the population of larvae.
Another approach is to prepare a sweet and sour trap. Mix 6 parts sugar, 3 parts vinegar, 1 part white wine, and 10 parts water. Add 1 part of 90% trichlorfon (a commonly used insecticide) and mix thoroughly. Alternatively, you can add an appropriate amount of pesticide to kimchi water and place it during the adult stage to attract and kill the moths.
Using black light traps is another effective way to control the adult armyworms. These traps can be set up in the field to capture and reduce the number of adults, thereby decreasing the chances of egg laying and subsequent larval infestation.
For chemical control, farmers can use 90% trichlorfon crystals diluted at 1000 times, or 50% malathion emulsifiable concentrate diluted between 1000 to 1500 times. A combination of 90% trichlorfon crystals diluted 1500 times and 40% dimethoate solution at 1500 times is also recommended. The best time to apply these treatments is when the larvae are three years old. Application involves spraying the solution, with a recommended dosage of 75 kg per acre.
By implementing these integrated pest management strategies, farmers can effectively reduce the impact of the wheat armyworm on their crops. It's important to monitor the fields regularly and take timely action to prevent large-scale infestations. Additionally, using organic methods alongside chemical controls can help maintain a healthier ecosystem while protecting the crops from damage.
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