Title page for ETD etd-04122012-170653


Type of Document Dissertation
Author Wallingford, Anna Kate
URN etd-04122012-170653
Title Investigating host plant selection of harlequin bug, Murgantia histrionica (Hahn), in order to improve a trap cropping system for its management.
Degree PhD
Department Entomology
Advisory Committee
Advisor Name Title
Kuhar, Thomas P. Committee Chair
Schultz, Peter B. Committee Co-Chair
Freeman, Joshua H. Committee Member
Pfeiffer, Douglas G. Committee Member
Tholl, Dorothea B. Committee Member
Keywords
  • olfactometer
  • harlequin bug
  • Murgantia histrionica
  • trap crop
  • choice test
  • neonicotinoid
  • plant volatile
  • murgantiol
Date of Defense 2012-03-30
Availability unrestricted
Abstract
Harlequin bug (HB), Murgantia histrionica (Hahn), is a pest of cole crops. Alternative control strategies were investigated for control of HB, including trap cropping and systemic neonicotinoid insecticide applications.

Potential trap crops, mustard (Brassica juncea ‘Southern Giant Curled’), rapeseed (B. napus ‘Athena’), rapini (B. rapa) and arugula (Eruca sativa) were preferred over collard (B. oleracea ‘Champion’), and a non-brassica control, bean (Phaseolus vulgaris ‘Bronco’) in field-cage choice tests. Harlequin bug could not complete development on bean, developed poorly on arugula but was found to complete development on mustard, collard, rapeseed and rapini.

In the field, mustard was found to be an effective trap crop for reducing HB feeding injury on collard at three experimental sites in 2010 and 2011. Augmentation of the mustard trap crop with a systemic, neonicotinoid insecticide did not increase the level of control of harlequin bug for the duration of the ten week growing period.

In olfactometer choice tests, male HB responded to plant volatiles of bean, collard and mustard, but preferred Brassica volatiles over those from bean. Female response to plant volatiles alone was weak and inconsistent. Both males and females preferred volatiles from other males feeding on Brassica host plant over plant volatiles alone, and were deterred by volatiles from males feeding on bean versus the plant alone.

Laboratory toxicity assays revealed that the neonicotinoid insecticides imidacloprid, thiamethoxam, dinotefuran, and clothianidin were toxic to HB nymphs; LC50 = 0.57, 0.52, 0.39, and 0.39 mg ai/liter, respectively. Field experiments were conducted to evaluate the efficacy of these insecticides over time when applied as a one-time drench, and all were found to provide significantly higher mortality of HB for at least 14 days after application.

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