Effect of microwave radiation on dry bean seed infected with Xanthomonas axonopodis pv phaseoli with and without the use of chemical seed treatment.

Friesen, A.P., Conner, R.L., Robinson, D.E., Barton, W.R., and Gillard, C.L. (2014). "Effect of microwave radiation on dry bean seed infected with Xanthomonas axonopodis pv phaseoli with and without the use of chemical seed treatment.", Crop Protection, 65, pp. 77-85. doi : 10.1016/j.cropro.2014.07.007  Access to full text

Abstract

Common bacterial blight (Xanthomonas axonopodis pv. phaseoli) is a seed-borne disease that is difficult to control in dry bean (Phaseolus vulgaris L.). Laboratory and field studies were conducted over a two-year period to determine the effect of microwave radiation on navy (cv. Navigator and Envoy) and pinto (cv. AC Ole) bean. Laboratory tests resulted in a 12 to 25% decrease in germination following 50–60 s of radiation, while less than a 10% loss was observed between 0 and 40 s. Pathogen viability was also tested, however the incidence of pathogen infection was low and no correlation was observed between exposure time and the incidence of colonization. In field studies conducted at Morden, MB (2012) and Ridgetown and Exeter, ON (2012–2013) microwave radiation and two chemical seed treatments (copper hydroxide 53.8% and pyraclostrobin + fluxapyroxad + metalaxyl) were evaluated for their effect on emergence, disease infection, seed pick, yield and return on investment. The application of microwave treatment decreased emergence by up to 7%, but did not impact the other parameters measured. Chemical treatment alone or in combination with microwave treatment also did not affect emergence, disease incidence, yield, seed pick, or return on investment.

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