Cleaning Ball,Sanitary Tri-Clamp Cleaning Ball,Sanitary Tank Cip Spray Ball,Cleaning Ball With Revolving Ball Wenzhou Gaoya Light Industry Machinery Co.,ltd. , https://www.hongyafitting.com
Cotton bollworm control tricks
1. Pruning: According to the survey, timely pruning during the second generation of bollworms can significantly reduce egg numbers by 40–60%. In fields affected by the second-generation cotton bollworm, the number of field eggs and larvae dropped by 3.8–54.5%, with an average reduction of 27.7%. During the peak of the fourth generation, removing side shoots and axillary buds in a timely manner reduced the egg and larval population by 52.5% and 58%, respectively. This practice not only helps control infestations but also improves overall plant health.
2. Egg Removal: Approximately 80% of the second-generation *H. armigera* eggs are laid on the tender tips and the front of leaves. At the peak of egg-laying, wiping off the eggs regularly—once every three days for 3–4 times—can effectively reduce damage. According to field surveys, even two rounds of wiping can lower egg counts by 60% or more, with some cases showing a reduction of up to 80–90%.
3. Irrigation: During the flood season of *H. armigera*, combining irrigation with flooding can kill about 70% of alfalfa pests. Another study found that if the surface soil is flooded for approximately 1.5 hours, the mortality rate of cotton bollworms reaches 100% one day after the soil is rehydrated. The death rate remains high at 77–85% for 3–4 days post-flood, and drops slightly to 61–73% afterward. This method is especially effective when applied in conjunction with other pest management strategies.
4. Foliar Fertilizer Spraying: During the adult stage of the cotton bollworm, applying a foliar spray of 1–2% superphosphate solution has been shown to reduce egg laying by 33.3–74.4% in cotton fields, with an average reduction of 55%. This technique not only controls the population but also enhances plant nutrition, making it a dual-purpose strategy.
5. Cockroach Control: After wheat harvest, killing the larvae promptly can achieve a bollworm mortality rate of 44.4%. This step is crucial in preventing the next generation from emerging, especially in areas where multiple crops are grown in succession.
6. Timing of Spraying: Since bollworms are sensitive to light and dark cycles, using agents such as Bt, phoxim, or formulations containing phoxim that have a "light-repelling" property, spraying in the early morning or late evening can improve control effectiveness by around 20%. This timing maximizes the exposure of pests to the pesticide, leading to better results.
7. Thorough Field Spraying: When bollworms are active, using the same insecticide and applying it thoroughly across the entire field increases control efficiency by 30–40%. Ensuring full coverage is essential, as missed areas can lead to rapid re-infestation.
These integrated methods offer a comprehensive approach to managing bollworm populations, reducing reliance on chemical pesticides while maintaining crop productivity.
Next Article
Chrysanthemum Top Ten Health Function
Prev Article
Cotton bollworm control tricks