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Introgression of Resistance to Cabbage Seedpod Weevil to Canola from Yellow Mustard

^a Dep. of Agricultural, Food and Nutritional Science, 4-10 Agriculture/Forestry Centre, Univ. of Alberta, Edmonton, AB, Canada T6G 2P5
^b Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada N1G 2W1

View larger version (27K): [in a new window]   Fig. 1. Frequency distribution of mean exit holes per pod from larvae of C. obstrictus in 230 hybrid genotypes derived from crosses of S. alba x B. napus. The dotted line indicates the cutoff for lines selected for further susceptibility assessment (mean of 0.05 exit holes per pod), and the dashed line indicates the approximate position of the commercial canola cultivar, B. napus cv. Q2 (mean of 0.24 exit holes per pod).

View larger version (16K): [in a new window]   Fig. 2. Mean C. obstrictus exit holes per pod for 21 S. alba x B. napus hybrid genotypes compared with B. napus cv. Q2 in field evaluations conducted near Lethbridge, AB, in 2002. Gray histograms indicate genotypes considered to have high susceptibility to attack by C. obstrictus (5% of pods with larval exit holes) and were excluded from further testing. White histograms were genotypes considered to have low susceptibility to C. obstrictus infestation (<5% of pods with larval exit holes) and were selected for further evaluations. The dotted line indicates the arbitrary cutoff between susceptible and resistant genotypes.

View larger version (34K): [in a new window]   Fig. 3. Mean time (seconds) taken by mated, gravid C. obstrictus females to complete each phase of the oviposition sequence on B. napus and eight S. alba x B. napus hybrid genotypes. Letters on histograms indicate statistical significance: means within each graph having the same letter indicate no significant difference using analysis of variance and Tukey's test (P > 0.05).