Acibenzolar-S-methyl may prevent vector-mediated flavescence doree phytoplasma transmission, but is ineffective in inducing recovery of infected grapevines

作者：Miliordos Dimitrios E; Galetto Luciana; Ferrari Ester; Pegoraro Mattia; Marzachi Cristina; Bosco Domenico

来源：Pest Management Science, 2017, 73(3): 534-540.

DOI：10.1002/ps.4303

<jats:title>Abstract</jats:title><jats:sec><jats:title>BACKGROUND</jats:title><jats:p>Acibenzolar‐<jats:italic>S</jats:italic>‐methyl (<jats:styled-content style="fixed-case">BTH</jats:styled-content>), a functional analogue of salicylic acid (<jats:styled-content style="fixed-case">SA</jats:styled-content>), is known to elicit a systemic resistance across a broad range of plant–pathogen interactions, but so far it has not been tested against flavescence dorée (<jats:styled-content style="fixed-case">FDP</jats:styled-content>), one of the most devastating grapevine diseases. The aim of this work was to evaluate the activity of <jats:styled-content style="fixed-case">BTH</jats:styled-content> in preventing <jats:styled-content style="fixed-case">FDP</jats:styled-content> transmission by the insect vector and in inducing recovery of infected grapevines.</jats:p></jats:sec><jats:sec><jats:title>RESULTS</jats:title><jats:p>Repeated 2 <jats:styled-content style="fixed-case">mM</jats:styled-content> applications of <jats:styled-content style="fixed-case">BTH</jats:styled-content> to test grapevine cuttings (cv. Barbera) exposed to adults of the infectious vector <jats:italic>Scaphoideus titanus</jats:italic> Ball reduced the rate of infected plants. The effect was not recorded following similar <jats:styled-content style="fixed-case">BTH</jats:styled-content> applications to highly susceptible young <jats:italic>in vitro</jats:italic> propagated vines. A high natural recovery rate (more than 70%) was observed over a 3 year period in field‐infected grapevines of the same cultivar. Under these conditions, <jats:styled-content style="fixed-case">BTH</jats:styled-content> repeated applications over the whole period clearly failed to increase recovery of field‐infected grapevines.</jats:p></jats:sec><jats:sec><jats:title>CONCLUSION</jats:title><jats:p>Following a 3 year experiment, it can be concluded that, although high doses and repeated applications of <jats:styled-content style="fixed-case">BTH</jats:styled-content> reduced vector transmission of <jats:styled-content style="fixed-case">FDP</jats:styled-content>, <jats:styled-content style="fixed-case">BTH</jats:styled-content> was ineffective in inducing recovery of <jats:styled-content style="fixed-case">FDP</jats:styled-content>‐infected grapevines cv. Barbera under field conditions.

• 出版日期2017-3