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Development and evaluation of pymetrozine controlled-release formulation to control paddy planthopper
Wei-Ming Xu1, Ming Zhang1, Kun Wei1
1State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University Guiyang 550025 P. R. China xuweiming2009@163.com +86 851 8362 0521 +86 851 8829 2090.
A new 1% pymetrozine controlled-release granule (CRG) effectively manages rice planthoppers for extended periods. This formulation offers a promising, eco-friendly alternative to conventional pesticides, with low toxicity and minimal residue.
Area of Science:
- Agricultural Entomology
- Pest Management
- Formulation Chemistry
Background:
- Continuous rice planthopper outbreaks necessitate improved management strategies.
- Current chemical controls in China rely on short-acting formulations requiring frequent application.
- Rapid degradation of active ingredients in paddy ecosystems limits pesticide effectiveness.
Purpose of the Study:
- To develop and evaluate a long-acting formulation for rice planthopper control.
- To assess the efficacy and environmental impact of a novel pymetrozine controlled-release granule (CRG).
Main Methods:
- Development of a 1% pymetrozine CRG using bentonite and resin coating.
- Analysis of pymetrozine release kinetics over 60 days.
- Field trials to evaluate insecticidal efficacy and terminal residues in brown rice.
- Toxicity assessment against beneficial organisms.
Main Results:
- The 1% pymetrozine CRG demonstrated sustained release, with over 80% active ingredient released in 60 days.
- Field efficacy ranged from 61.96% to 78.87% control at 48 days post-application.
- Terminal residues in brown rice remained below maximum residue limits set by China and Japan.
- The CRG exhibited low toxicity to tested beneficial organisms.
Conclusions:
- Pymetrozine CRG (1%) offers effective, long-lasting control of paddy planthoppers.
- This formulation overcomes the limitations of rapid active ingredient degradation.
- The CRG presents a potentially safer and more sustainable pest management solution.
