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Plant health effects and pathogen sensitivity of strobilurin fungicides on lentil, chickpea and field pea.

McDonald, M.R., Perumal, V., Gossen, B.D., and Banniza, S. 2016. Plant health effects and pathogen sensitivity of strobilurin fungicides on lentil, chickpea and field pea. Proc. 18th Intern. Reinhardsbrunn Symposium, April 24 28, 2016, Friedrichroda, Germany. Abstract 46.

Abstract

Strobilurin fungicides are effective tools for disease management that may also increase crop yield via changes in plant physiology, but are susceptible to rapid erosion of pathogen sensitivity. Replicated, small-plot field trials were conducted at a site in Ontario, Canada (44’02’’ N 75’ 35” W), to evaluate plant health effects on lentil, chickpea and field pea. The site was chosen because disease pressure was expected to be very low. The strobilurin fungicides pyraclostrobin and azoxystrobin were compared to chlorothalonil and an untreated check from 2013 to 2015. Fungicides were sprayed once, at early flowering. Two cultivars of each crop were assessed. Plots were rated for disease incidence, greenness (0 = yellow, 5= very green), height, lodging, shoot weight, and seed yield. On lentil, the incidence of foliar disease was low (< 6%) each year. Application of pyraclostrobin resulted in greener plants in 2013 and 2014, less lodging on cv. Maxim, higher seed weight on cv. Dazil in 2014, and taller plants on both cultivars in 2015. On chickpea, incidence ranged from < 5% in 2013 to 58% in 2014, but there were no differences in disease, plant growth or yield related to fungicide. On field pea, incidence was high in 2014 (47%) and 2015 (54%). Each fungicide reduced disease in 2014, as did pyraclostorbin and chlorothalonil in 2015. Increased plant height was related to improved disease control (R2 = 0.26, P = 0.003). We conclude that lentil was more responsive to plant health effects of strobilurins than chickpea or field pea. About half of the isolates of Mycosphaerella pinodes (field pea) collected from 2013 2015 on the Canadian prairies were insensitive to strobilurin fungicides (up from 8% in 2012) and the entire population of Didymella rabiei (chickpea) was also insensitive.

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