Vegetable worms are a major threat to cruciferous vegetables worldwide, causing significant economic losses each year. Imidacloprid is one of the most commonly used pesticides for controlling aphids on these crops. Traditionally, it has been applied by spraying the entire plant when aphid infestations appear. However, this method not only harms beneficial insects and pollinators but also leads to environmental pollution. In recent years, repeated use of imidacloprid has led to a decline in its effectiveness, with shorter control periods and increased resistance among pest populations.
To address these challenges, researchers from the Plant Protection Institute of the Henan Academy of Agricultural Sciences and the Ministry of Agriculture's Pesticide Verification Institute have developed an improved application method—root absorption. This technique involves applying imidacloprid directly to the soil, allowing it to be absorbed through the roots and distributed throughout the plant. Field trials showed that 5% imidacloprid granules and 10% wettable powder, applied before sowing at a rate of 30 g/mu of active ingredient, provided excellent control against radish aphids. The insect mortality rate reached 100% within 10–20 days after treatment.
In larger field trials, mixing the pesticide into the soil during planting resulted in remarkable efficacy. At the same dosage of 30 g/mu, the control rates were 98.3% and 92.2% respectively 15 days after application, and both reached 100% by day 25–35. These results demonstrate that the root-conduction method offers long-lasting protection, lasting over a month, which effectively controls aphids throughout the crop’s growth cycle.
Compared to traditional foliar sprays, this approach reduces labor costs, protects natural predators, minimizes environmental impact, and targets pests more precisely. Additionally, it also helps control underground pests such as fly larvae and root maggots. With its efficiency, safety, and sustainability, this method represents a promising alternative to conventional pesticide practices and is well worth promoting for wider adoption in agricultural settings.
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