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Seedborne infection affects anthracnose development in two dry bean cultivars

Conner, R.L., Chen, Y., Hou, A., Balasubramanian, P.M., McLaren, D.L., McRae, K.B. (2009). Seedborne infection affects anthracnose development in two dry bean cultivars, 31(4), 449-455.


Anthracnose, caused by the seedborne pathogen Colletotrichum lindemuthianum, is a serious disease of dry bean (Phaseolus vulgaris) that can severely reduce seed yield and quality. A 2 year field study examined how seedborne infection (0%, 1%, 2%, 5%, 10%, and 20%) affected seedling emergence, seedling infection, the buildup of anthracnose in the crop canopy, yield, seed mass, and seed discolouration in 'Navigator' navy bean and 'AC Ole' pinto bean. The incidence of seedling infection was significantly higher in 'AC Ole' than it was in 'Navigator' resulting in an early establishment of the disease on the pinto bean cultivar. There was a linear increase (P < 0.01) in anthracnose severity within the crop canopy and on the pods with higher rates of seedborne infection in both cultivars. Increases in seedborne infection rates also resulted in a significant decline (P < 0.01) in yield and seed mass. Comparisons of the 0% and the 20% seedborne treatments indicated that severe anthracnose development resulted in yield losses of 27% in 'Navigator' and 20% in 'AC Ole'. These losses are comparable with the extent of yield reductions reported in a previous fungicidal study on anthracnose control in Manitoba.

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