Improving the efficacy against crop foliage disease by regulating fungicide adhesion on leaves with soft microcapsules

Pest Management Science - Tập 77 Số 10 - Trang 4418-4424 - 2021
Shouhe Pan1, Haichao Cao1, Bei‐xing Li1,2, Da‐xia Zhang3, Wei Mu1,2, Feng Liu1,4
1Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection Shandong Agricultural University Tai'an P. R. China
2Research Center of Pesticide Environmental Toxicology, Shandong Agricultural University, Tai'an, P. R. China
3State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
4Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection, Shandong Agricultural University, Tai'an, P. R. China

Tóm tắt

AbstractBACKGROUNDIncreasing pesticide retention on crop leaves is a key approach for guaranteeing efficacy when products are applied to foliage. Evidently, the formulation plays an important role in this process. Microcapsules (MCs) are a promising formulation, but whether and how their adhesion to the leaf surface affects retention and efficacy is not well understood.RESULTSIn this study, we found that the incorporation of polyethylene glycol (PEG) with different molecular weights into the MC shell affects the release profile of MCs and the contact area of these MCs to leaves by changing their softness. The cumulative release rates of pyraclostrobin (Pyr) MCs fabricated with PEG200, PEG400, PEG800 and PEG1500 were 80.61%, 90.98%, 94.07% and 97.40%, respectively. Scanning electron microscopy observations showed that the flexibility of the MCs increased with increasing PEG molecular weight. The median lethal concentration (LC50) of the MCs with different PEG to the zebrafish were 12.10, 8.10, 3.90 and 1.46 mg L−1, respectively, which also indirectly reflected their release rate. Rainwater had less influence on the retention of the MCs prepared with PEG1500 than with the other PEG, which indicates a better adhesion to the target leave surfaces. MCs with the highest residual efficacy had better control efficacy on peanut leaf spot in field trials.CONCLUSIONOverall, adding PEG with an appropriate molecular weight to the MC shell can regulate the structure of the MC shell to improve the affinity between the MCs and leaves, which further improves the utilization of pesticides and reduces the environmental risks of pesticides. © 2021 Society of Chemical Industry.

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Pest Management Science

Tập 77 Số 10

4418-4424

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