Graduate Thesis Or Dissertation
 

An evaluation of factors influencing the management of Otiorhynchus sulcatus (F.) (Coleoptera: Curculionidae)

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  • The black vine weevil (BVW), Otiorhynchus sulcatus (F.) (Coleoptera: Curculionidae) is a persistent pest of nursery operations in the United States, feeding on over 140 species of plants. The goals of this research were to 1) assess the behavioral response of BVW to a commonly employed insecticide bifenthrin (Talstar 0.2G®) and the entomopathogenic fungus Metarhizium anisopliae (Metchnikoff) Sorokin (Hypocreales: Clavacipitaceae), 2) determine what effect application of M anisopliae has on root growth when applied as a root dip and quantify differences in BVW larval herbivory between plants treated with M anisopliae and controls. The behavioral response of BVW larvae to bifenthrin and M anisopliae were assessed using a still air olfactometer developed for the purposes of this experiment. Larvae were allowed to choose between M anisopliae (1 x 106 spores per g dry media) and untreated media, bifenthrin (25 ppm) and untreated media, as well as M anisopliae and bifenthrin treated media. For all comparisons, experiments were conducted without plants in the system to test for innate responses, as well as with plants to test typical nursery conditions. Larvae were significantly deterred from potting media incorporated with bifenthrin in all situations tested. Larvae exhibited no such deterrence to media incorporated with M anisopliae. In trials without plants, larvae exhibited no discernable pattern of movement in response to M anisopliae. With plants in the system larvae showed a significant attraction to plants growing in soil treated with M anisopliae. The effect of treatment of plant roots with M anisopliae on root growth and herbivory by BVW larvae was assessed in the following manner. Plants were randomly allocated to one of three treatments: immersion in 1 x 106 spores mU1 of M anisopliae up to the root crown, immersion in 0.05% Tween 80 (spore surfactant) or an untreated control. Each treatment was performed with and without BVW larval infestation. Measurements of root length for each plant used in these experiments were obtained prior to treatment, and two and six weeks after BVW larval infestation. Results suggest that there is no inherent reduction in root growth as a result of treatment with M anisopliae. The effects of M anisopliae on BVW larval feeding are less clear, but there is an indication that some level of protection may be afforded.
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Déclaration de droits
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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