The Occurrence and Control Techniques of the Corn Leafworm (Twinkle Leafhopper)

First, the symptoms of damage

The pest primarily affects the leaves, tassels, and ears of corn. When the leaves are damaged, they are often eaten from the inside, leaving only the outer layer, which results in large, transparent white spots on the surface. These spots significantly reduce the plant's ability to perform photosynthesis. Additionally, the pest damages the tassels and ears, which can interfere with the pollination process and lead to poor kernel development. On average, this type of damage can result in a 15% reduction in corn yield.

Second, the timing of the infestation
The pests are most active during July and August, which corresponds to the early heading and flowering stages of maize. The peak feeding activity occurs between 10:00 am and 5:00 pm, making these times the most critical for monitoring and control efforts.

Third, prevention and control measures
1. **Agricultural control** Removing weeds around the field edges, along ditches, and in surrounding areas can help reduce the pest population. In autumn, deep plowing can also help destroy eggs that may be present in the soil, thereby lowering the number of pests in the following season.
2. **Chemical control** - Apply a 5,000-fold dilution of pyrethroid insecticides such as cypermethrin or cyhalothrin. These products are effective against a wide range of pests and have a relatively low impact on beneficial insects. - Use 45% chlorpyrifos EC at a 1,500-fold dilution to simultaneously manage armyworms, corn borers, thrips, and chafers. This approach is especially useful when multiple pests are present. It is recommended to apply these sprays in the late afternoon or early morning, as this timing maximizes effectiveness while minimizing exposure to high temperatures and sunlight, which can reduce the efficacy of the chemicals.
By combining these strategies, farmers can effectively manage pest populations and minimize crop losses, ensuring better yields and healthier crops.
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Posted on September 19, 2025