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canada thistle biological control


8 Images
1929057
Leslie Dietz

1929056
Alec McClay
McClay Ecoscience

in canola (Rape seed) field near Consort, Alberta

1929048
Alec McClay
McClay Ecoscience

1929049
Alec McClay
McClay Ecoscience

in stem

1929051
Alec McClay
McClay Ecoscience

1929052
Alec McClay
McClay Ecoscience

in seed head

1929053
Alec McClay
McClay Ecoscience

1929055
Alec McClay
McClay Ecoscience

galls