Title page for ETD etd-05162011-233118


Type of Document Master's Thesis
Author Cassell, Meredith Edana
Author's Email Address mcassell@vt.edu
URN etd-05162011-233118
Title BEAN LEAF BEETLE: IMPACT OF LEAF FEEDING INJURY ON SNAP BEANS, HOST PLANT CHOICE AND ROLE AS A VECTOR OF BEAN POD MOTTLE VIRUS IN VIRGINIA
Degree Master of Science In the Life Sciences
Department Entomology
Advisory Committee
Advisor Name Title
Kuhar, Thomas P. Committee Co-Chair
Schultz, Peter B. Committee Co-Chair
Pfeiffer, Douglas G. Committee Member
Salom, Scott M. Committee Member
Tolin, Sue A. Committee Member
Keywords
  • Cerotoma trifurcata
  • Snap Bean
  • Bean Pod Mottle Virus
  • Mechanical Defoliation
  • Exclusion Cage
  • Feeding Preference
Date of Defense 2011-04-12
Availability unrestricted
Abstract
The bean leaf beetle (BLB), Cerotoma trifurcata (Forster) (Coleoptera: Chrysomelidae), is a pest of commercially produced legumes in eastern Virginia. Field cage and manual-defoliation studies were conducted in Virginia to determine an economic impact of BLB. In the manual-defoliation study, snap bean plants had significant yield loss when > 25% of leaf area was removed. In the field cage experiments, I was unable to establish beetle densities per plant to impact yield. Host plant selection by BLB was done in laboratory and field studies with snap bean, lima bean, and soybeans. Laboratory studies showed that BLB preferred snap bean and lima bean over soybean. Field studies did not showed no preference. A survey was conducted on the Eastern Shore of Virginia determine the epicenter of BPMV. Soybean leaves and beetles were collected and assessed for BPMV by ELISA or TBIA. Beetles at the ESAREC were BPMV-positive upon emergence from overwintering sites, but the virus load was low when tested by ELISA. This suggests acquisition of virus from a source other than infected cultivated legumes. To find the potential inoculum sources of BPMV in eastern Virginia, leguminous weeds and perennial weeds were tested for BPMV. Four weed species gave BPMV-positive tissue blots including: Oxalis stricta, Rumex acetosella, Trifolium pretense, and Trifolium repens. Insecticidal seed treatment of thiamethoxam on soybean seeds was evaluated to test the efficacy. Leaf area eaten and beetle mortality was measured. The thiamethoxam seed treatment protected soybean seedlings from beetle feeding through the V2 stage of growth.

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