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

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Title: DEVELOPMENT OF A DEGREE DAY MODEL AND ECONOMIC THRESHOLDS FOR CEROTOMA TRIFURCATA (COLEOPTERA: CHRYSOMELIDAE) IN ONTARIO
Author: McCreary, Cara M.
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Hallett, Rebecca H.Schaafsma, Art W.
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.
URI: http://hdl.handle.net/10214/7474
Date: 2013-08


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