Use of horticultural mineral oils to control potato virus Y (PVY) and other non-persistent aphid-vectored viruses
Publication date: Available online 8 January 2019
Source: Crop Protection
Author(s): Qiongyu Yang, Steven Arthurs, Zhenxu Lu, Zhiyong Liang, Runqian Mao
Aphids are among the most serious agricultural insect pests due to their rapid colonization, population growth and the ability of at least 200 species to transmit plant viruses. Among the more effective insecticides used to manage non-persistent aphid viruses are the horticultural mineral oils (HMO). Over the past several decades, research has uncovered several mechanisms whereby HMO reduce the acquisition and transmission of non-persistent aphid viruses. Direct mechanisms include rapid insecticidal activity and a reduced binding and retention of virions within the aphid stylet and foregut. Indirect mechanisms include sub-lethal effects on aphid behaviors and the potential induction of various constitutive plant defense pathways. These features, along with relatively low cost, compatibility with many natural enemies and lack of reported aphid resistance mechanisms make HMO valuable in integrated aphid/virus management programs. In this review, we discuss the current status and ongoing research concerning how HMO control aphid-borne viruses, focusing on primary infections (immigrating alates) and within-crop spread. We also summarize recent efforts to apply this knowledge, for example through implementing ‘crop border spray strategies’ in seed potato crops and propose research directions.
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