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DEVELOPMENT OF A DEGREE DAY MODEL AND ECONOMIC THRESHOLDS FOR CEROTOMA TRIFURCATA (COLEOPTERA: CHRYSOMELIDAE) IN ONTARIO

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dc.contributor.advisor Hallett, Rebecca H.
dc.contributor.advisor Schaafsma, Art W.
dc.contributor.author McCreary, Cara M.
dc.date.accessioned 2013-09-06T21:06:05Z
dc.date.available 2013-09-06T21:06:05Z
dc.date.copyright 2013-08
dc.date.created 2013-06-24
dc.date.issued 2013-09-06
dc.identifier.uri http://hdl.handle.net/10214/7474
dc.description.abstract Bean leaf beetle, Cerotoma trifurcata (Forster) (Coleoptera: Chrysomelidae), is an economic pest of soybean in Ontario. Field cage studies were conducted in 2010-2011 to determine voltinism in southern Ontario and the effect of C. trifurcata feeding during soybean reproductive stages on soybean yield and quality. Thermal requirements for C. trifurcata development were determined in a laboratory study. Results of field and laboratory studies support the occurrence of one generation of C. trifurcata in southern Ontario. Pod-feeding increased with both number of beetles and soybean reproductive stage. An increase in defoliation and a reduction in seed quality were observed with increasing number of beetles. Monitoring programs for late-season pod-feeding should begin when degree days approach 500 (base 9.31°C). Economic thresholds for C. trifurcata during soybean reproductive stages range from 0.27 to 2.00 beetles per plant or 8 to 60 beetles per m of row. en_US
dc.description.sponsorship Ontario Ministry of Agriculture and Food – University of Guelph Sustainable Production (Plants) Program and Grain Farmers of Ontario through the Farm Innovation Program. en_US
dc.language.iso en en_US
dc.subject Bean leaf beetle en_US
dc.subject Cerotoma trifurcata en_US
dc.subject degree day model en_US
dc.subject economic injury level en_US
dc.subject economic threshold en_US
dc.subject thermal requirements en_US
dc.subject soybeans en_US
dc.title DEVELOPMENT OF A DEGREE DAY MODEL AND ECONOMIC THRESHOLDS FOR CEROTOMA TRIFURCATA (COLEOPTERA: CHRYSOMELIDAE) IN ONTARIO en_US
dc.type Thesis en_US
dc.degree.programme Environmental Sciences en_US
dc.degree.name Bachelor of Science in Environmental Sciences en_US
dc.degree.department School of Environmental Sciences en_US
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