Details

Autor(en) / Beteiligte

• Pan, Shou-He
• Cao, Hai-Chao
• Li, Bei-Xing
• Zhang, Da-Xia
• Mu, Wei
• Liu, Feng

Titel

Improved the Efficacy against Crop Foliage Disease by Regulating Fungicide Adhesion on Leaves with Soft Microcapsules

Ist Teil von

• Pest management science, 2021-05

Ort / Verlag

England

Erscheinungsjahr

2021

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Increasing 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. In 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. SEM observations showed that the flexibility of the MCs increased with increasing PEG molecular weight. The LC of the MCs with different PEG to the zebrafish were 12.10, 8.10, 3.90 and 1.46 mg L , 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. Overall, adding PEG with an appropriate molecular weight to the MC shell can regulate the structure of the microcapsule shell to improve the affinity between the MCs and leaves, which further improves the utilization of pesticides and reduces the environmental risks of pesticides. This article is protected by copyright. All rights reserved.