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Responses of Poa annua and three bentgrass species (Agrostis spp.) to adult and larval feeding of annual bluegrass weevil, Listronotus maculicollis (Coleoptera: Curculionidae)

Published online by Cambridge University Press:  29 June 2016

O.S. Kostromytska  and
A.M. Koppenhöfer
O.S. Kostromytska*
Affiliation:
Department of Entomology, Rutgers University, New Brunswick, NJ 08901, USA
A.M. Koppenhöfer
Affiliation:
Department of Entomology, Rutgers University, New Brunswick, NJ 08901, USA
*
*Author for Correspondence Phone: +1-352-8712781 Fax: +1-732-932-7229 E-mail: kolgaent@rci.rutgers.edu
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Abstract

The annual bluegrass weevil (ABW), Listronotus maculicollis Kirby, is an economically important pest of short-cut turfgrass in Eastern North America. Wide spread insecticide resistance warrants the development of alternative management strategies for this pest. ABW damage typically occurs in areas with a high percentage of annual bluegrass, Poa annua L., the preferred ABW host. Damage to bentgrasses, Agrostis spp., is much rarer and usually less severe. To aid the implementation of host plant resistance as an alternative ABW management strategy we investigated the tolerance of three bentgrass species to ABW feeding. Responses of P. annua, creeping bentgrass, Agrostis stolonifera L., colonial bentgrass, Agrostis capillaris L., and velvet bentgrass, Agrostis canina L., to adult and larval feeding were compared in greenhouse experiments. Grass responses were measured as visual damage, dry weight of the grass stems and leaves, color, density and overall grass quality. To determine possible mechanisms of grass tolerance constitutive fiber and silicon content were also determined. The three bentgrass species tolerated 2–3 times higher numbers of ABW adults and larvae than P. annua before displaying any significant quality decrease. Creeping bentgrass had the lowest damage ratings. ABW infestation caused higher plant yield reduction in P. annua (up to 42%) than in bentgrasses. Observed differences among the grass species in fiber and silicon content in the plant tissue are unlikely to play a role in the resistance of bentgrasses to ABW. Our findings clearly show that A. stolonifera is the best grass species for the implementation of host plant resistance in ABW management.

Keywords

Listronotus maculicollisannual bluegrass weeviltolerancePoa annuabentgrassAgrostis spp.
Type
Research Papers
Information
Bulletin of Entomological Research , Volume 106 , Issue 6 , December 2016 , pp. 729 - 739
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Copyright
Copyright © Cambridge University Press 2016 

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