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In recent years, underground pests such as alfalfa weevils, cockroaches, tiger beetles, and golden nematodes have become increasingly problematic in mountainous regions. These pests cause significant damage to crops by destroying seedlings and disrupting plant rows, leading to the need for repeated replanting. Due to their nocturnal activity and subterranean hiding habits, traditional insecticides are often ineffective. According to the **Chinese Pesticide Network**, it is necessary to use specialized insecticides designed specifically for underground pests. One of the most effective options is methyl isoflavin.
Methyl isoflavin is a highly toxic pesticide with strong contact, stomach, and systemic effects on pests. It has a broad spectrum of activity and a long residual effect, with efficacy lasting over a month. It is particularly suitable for controlling underground pests in crops like corn, wheat, peanuts, beans, potatoes, and tobacco, including nematodes. Additionally, it can effectively manage other pests such as aphids, red spider mites, armyworms, tobacco budworms, and peach borer.
Currently, the main formulations of methyl isoflavin include emulsifiable concentrates, granules, and fumigants. For controlling underground pests, the emulsion can be diluted and applied to seeds. For example, 50 ml of 40% emulsifiable concentrate can be mixed with 5 kg of water and evenly sprayed onto 50 kg of corn or wheat seeds using a sprayer. The seeds should be turned while spraying until the liquid is fully absorbed before drying and sowing. Alternatively, the emulsion can be used as "poisoned sand" by mixing 40 ml of the concentrate with 250 ml of water and incorporating it into 50 kg of fine sand per acre, then sprinkled during sowing or in planting holes.
The most convenient method is using granules—applying 1.5 to 2.0 kg of 5% granules per acre during planting, either mixed into the soil or placed in furrows. Methyl isoflavin fumigants are primarily used for controlling voles.
It is important to note that **methyl isoflavin is highly toxic to humans and animals**. Its oral toxicity is comparable to that of methamidophos, while its skin contact toxicity is 4 to 5 times higher. Therefore, it should only be used for early pest control in crops with long growing seasons. According to regulations, it is not permitted for use on vegetables, fruit trees, tea, or medicinal plants. Moreover, whether targeting underground pests or other insects, methyl isoflavin must only be used for seed treatment or soil application. Foliar spraying is strictly prohibited, and it cannot be applied within 45 days of harvesting food crops. Always follow safety guidelines when handling this powerful pesticide.