Effects of inert granite dust treatment on volatile emmisions and herbivory of Asiatic lilies (Lilium asiaticum L.)
LE3 .A278 2019
Bachelor of Science
Earth & Environmental Sciences
Plants produce a multitude of volatile compounds that have roles in reproduction, stress response, and multitrophic interactions. Current trends in agriculture seek to find safer, sustainable methods for crop protection against such pests. Recent work has determined a novel granite dust bio-product as a natural alternative (similar to diatomaceous earth) which has been used as an insecticide and repellent agent with promising results in controlling Lilioceris lilii (lily leaf beetle), an invasive pest that causes significant damage to Lilium spp. It has been observed that dust-treated lily plants repelled lily leaf beetles. This study explores how this mineral dust may affect volatile emission and herbivore acceptance in lily plants. Granite rock dust was applied as soil, foliar and soil+ foliar treatments to lily plants. Volatiles were collected from untreated and treated lilies at different time intervals and analyzed via gas chromatography-mass spectrometry. Electroantennograms were performed in order to investigate the response of L.lilii adults towards volatiles from treated and control lily leaves that underwent mechanical damage. No differences were detected in volatile emissions within treatments over time, with the only exception of benzyl alcohol which was only emitted by foliar + soil treatments. It is unknown if lily beetles are responsive to this compound. Electrophysiological response of lily leaf beetles to foliar and soil + foliar treatments was significantly greater than responses to untreated plants; soil treatments did not elicit significant responses. Changes in plant volatile emission after rock dust application may provide novel approaches for managing insect pests, while improving the sustainability of conventional agricultural practices.
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