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Liriomyza sativae is a major pest affecting vegetable production in the city. It has a wide distribution, rapid reproduction, multiple generations, and overlapping life cycles, making it highly susceptible to chemical pesticides. In recent years, this pest has caused significant damage to melons and legumes, impairing photosynthesis and even leading to leaf yellowing and plant death. To address these issues, there is an urgent need for more effective, low-toxicity or non-toxic pesticides that can control L. sativae while minimizing environmental pollution, protecting natural predators, and reducing pesticide resistance. This study was conducted at the Victoria Green vegetable production base to evaluate the effectiveness of plant-based pesticides in controlling L. sativae, providing a scientific basis for their large-scale application.
The test agents used were Weilubao (0.5% quinaldine solution), provided by the Hengyang Institute of Biological Resources, and 2.5% Kung Fu EC, supplied by the Plant Protection and Phytosanitary Station. The experiment was carried out in Huangzhou Village, Chashan Town, a suburban area with sandy loam soil and uniform fertility. The test crops were cucumbers with 12–15 leaves per plant, at a density of 3,000 plants per mu. The experimental design included four treatments:
1) Weilubao at 225 ml per mu (400 times dilution),
2) Weilubao at 150 ml per mu (600 times dilution),
3) 2.5% Kung Fu EC at 45 ml per mu (2000 times dilution),
4) A blank control with only water.
The randomized block design was repeated three times, resulting in 12 plots of 58 square meters each. Spraying was done on August 14th during the peak larval stage using manual sprayers, applying 90 kg of solution per mu. Both upper and lower leaf surfaces were covered. Plastic sheets were used to prevent cross-contamination between treatments.
Insect population surveys were conducted before treatment, 3 days after, and 7 days after. Each plot had 10 clusters surveyed, with 3 leaves marked per cluster, totaling 30 clusters and 90 leaves per treatment. Live insect counts were recorded, and corrected efficacy rates were calculated. Meteorological data showed an average temperature of 28.91°C and 72.75% relative humidity over seven days post-treatment, with 19.7 mm of rainfall occurring within the first three days. No rain occurred after 36 hours of spraying.
The results showed that Weilubao had good control effects against L. sativae. Three days after application, the corrected efficacy rates were 71.70% (225 ml) and 67.74% (150 ml), compared to 75.86% for Kung Fu EC (45 ml). Seven days after treatment, the efficacy increased slightly to 72.51% and 70.02%, respectively, with Kung Fu EC showing 76.31%. The differences were statistically significant.
Based on these findings, Victoria Green plant pesticide demonstrates strong potential for controlling L. sativae. It is recommended to use a 400- to 600-fold dilution, ensuring even coverage and considering a second application after 7 days if necessary. Expanding the demonstration area and promoting its use in the Hengyang Vegetable Zone is strongly advised.
Test leaders:
Tang Chunsheng (Senior Agronomist)
Gao Jiasheng (Senior Agronomist)
Cui Dezhi (Agronomist)
August 30, 1997