How to translate text using browser tools
22 June 2017 Bacterial Inoculant Treatment of Bermudagrass Alters Ovipositional Behavior, Larval and Pupal Weights of the Fall Armyworm (Lepidoptera: Noctuidae)
Richard Murphey Coy, David W. Held, Joseph W. Kloepper
Author Affiliations +

Nonpathogenic soil bacteria can colonize the rhizosphere and induce unique plant phenotypes that may influence plant–insect interactions. However, few studies have considered the influences of bacteria–plant interactions on insect feeding and oviposition. The objective of this study was to determine how rhizobacterial inoculation of bermudagrass affects larval development and ovipositional behaviors of the fall armyworm (Spodoptera frugiperda J.E. Smith). Eight blends of rhizobacteria known to induce root or shoot growth in grasses were applied weekly to hybrid bermudagrass for 5 wk. Oviposition was evaluated in two no-choice trials with bacteria-treated, fertilized, or nontreated grass. Grass blades from these treatments were extracted in polar and nonpolar solvents and assayed for oviposition responses. Another experiment compared the development of fall armyworm larvae on bermudagrass treated with each of the eight rhizobacterial blends for 5 wk to larvae fed nontreated bermudagrass. Females deposited more eggs on nontreated and fertilized grass and ≤34% of eggs on grass treated with rhizobacterial blends. Moths exposed to polar and nonpolar extracts were unable to reproduce these results. Larval and pupal weights at days 10 and 12 and the number of adults to eclose were lower for larvae fed some, but not all, bacteria-treated bermudagrass relative to controls. This is one of the few studies to investigate plant–microbe–insect interactions in an economically important system. Although the effects noted with fall armyworm are limited, induced changes in roots also reported for these bacteria may have greater utility than foliar changes for mediating interactions with biotic or abiotic stresses.

©The Authors 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email:
Richard Murphey Coy, David W. Held, and Joseph W. Kloepper "Bacterial Inoculant Treatment of Bermudagrass Alters Ovipositional Behavior, Larval and Pupal Weights of the Fall Armyworm (Lepidoptera: Noctuidae)," Environmental Entomology 46(4), 831-838, (22 June 2017).
Received: 2 March 2017; Accepted: 15 May 2017; Published: 22 June 2017

This article is only available to subscribers.
It is not available for individual sale.

biological control
plant growth-promoting rhizobacteria
Tritrophic interaction
Get copyright permission
Back to Top