Liriomyza sativae has become a major threat to vegetable farming, causing extensive damage and spreading rapidly, making complete eradication difficult. Timely application of effective pesticides is essential for managing this pest. This species primarily affects both protected and open-field vegetables such as beans, cucumbers, loofah, tomatoes, and eggplants. Implementing pesticide control at the right time is a key component of an integrated pest management strategy.
In recent years, the use of biological pesticides has shown promising results in controlling Liriomyza sativae. The first choice for biological control includes 0.2% Avermectin emulsifiable concentrate and 25% Chlorfenapyr suspension, both of which have demonstrated insecticidal efficacy exceeding 95%.
Avermectin, the active ingredient in Avicel, is commonly known as "Qiqisu" in China. It is an antibiotic produced through microbial fermentation and works by blocking nerve signals in most agricultural pests. Diflubenzuron, also known as Chlorbenzuron, belongs to the class of insect growth regulators. It functions by inhibiting chitin synthesis in insects, preventing them from molting properly and eventually leading to their death.
When using Avicel and Diflubenzuron No. 3 as biological pesticides to control Liriomyza sativae, there are three main advantages:
1. **High efficacy with long residual activity**: When applied at a dilution of 1500 times for 0.2% Avicel or 1000 times for 25% Diflubenzuron No. 3, the control effect can exceed 95%, with a residual period lasting up to 20 days.
2. **Safe for natural enemies and the environment**: These two products have minimal impact on beneficial insects and are considered environmentally friendly, low-toxicity, and low-residue options. They meet the standards required for producing “non-polluting†vegetables.
3. **Crop safety**: Even when used at higher concentrations over multiple applications, these pesticides generally do not cause phytotoxicity in most vegetable crops.
The best time to apply Avicel and Diflubenzuron No. 3 is during the larval stage of Liriomyza sativae. Spraying should be done every 7 days, and it may be necessary to apply 2 to 4 times depending on the infestation level. These two agents can be used alone or alternately for better results.
The China Pesticide Network advises users to exercise caution when applying pesticides. To enhance the effectiveness of the treatment, it is recommended to add a pesticide synergist diluted at 1000 times. This improves the penetration, coverage, and adhesion of the pesticide, ensuring a more lasting and efficient control outcome.
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