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Fixed-Quat: An Attractive Nonmetal Alternative to Copper Biocides against Plant Pathogens
Journal of Agricultural and Food Chemistry ( IF 6.1 ) Pub Date : 2018-12-04 00:00:00 , DOI: 10.1021/acs.jafc.8b04189
Mikaeel Young , Ali Ozcan , Parthiban Rajasekaran , Preeti Kumrah , Monty E. Myers 1 , Evan Johnson 1 , James H. Graham 1 , Swadeshmukul Santra
Affiliation  

In this paper, we report a nonphytotoxic bactericide and fungicide formulation containing a composite of silica and quaternary ammonium compound (quat). The composite material was prepared using an acid-catalyzed sol–gel method. Positively charged quat was associated with a negatively charged silica-gel matrix, producing a stable suspension of fixed-quat gel (FQ-G). The morphology of FQ-G and the interaction of quat with silica were characterized using SEM and FTIR, respectively. Silica gel significantly reduced quat phytotoxicity when tested at 500 and 1000 μg/mL foliar-application rates. The in vitro antimicrobial efficacy of FQ-G was evaluated against Xanthomonas alfalfae, Pseudomonas syringae, and Clavibacter michiganensis, showing comparable efficacies to that of quat itself. In field conditions, its efficacy in controlling the bacterial and fungal diseases citrus canker, scab, and melanose on ‘Ray Ruby’ red grapefruit was evaluated. Foliar application rates at 100 and 200 μg/mL provided comparable disease control to those of several copper standards, demonstrating the potential for use as an alternative agricultural biocide.

中文翻译:

固定定量:针对植物病原体的铜杀生物剂的有吸引力的非金属替代品

在本文中,我们报告了一种含有二氧化硅和季铵化合物(季铵盐)的复合物的非植物毒性杀菌剂和杀真菌剂。复合材料是使用酸催化的溶胶-凝胶法制备的。带正电荷的季铵盐与带负电荷的硅胶基质相关联,可产生稳定的固定季铵盐凝胶(FQ-G)悬浮液。用SEM和FTIR分别表征了FQ-G的形态和季铵盐与二氧化硅的相互作用。当以500和1000μg/ mL的叶面施用量进行测试时,硅胶显着降低了季铵盐的植物毒性。评估了FQ-G对苜蓿黄单胞菌丁香假单胞菌密歇根杆菌的体外抗菌功效,显示出与季铵盐本身相当的功效。在田间条件下,评估了其在控制'Ray Ruby'红色葡萄柚上的细菌性和真菌性疾病如柑橘溃疡病,结ab和黑色素的功效。叶面施用量为100和200μg/ mL时,可提供与几种铜标准品相当的病害控制,证明了其可替代农业杀生物剂的潜力。
更新日期:2018-12-04
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