Reduced Fungicide Applications and Host Resistance for Managing Three Diseases in Pumpkin Grown on a No-Till Cover Crop

Plant Disease
K L Everts

Abstract

Two recent changes in Maryland pumpkin production are (i) planting no-till into a cover crop with soil surface residue (70% of acreage) and (ii) adoption of cultivars with moderate resistance to powdery mildew. Pumpkin cultivar resistance to powdery mildew, planting method (no-till cover crop or conventional tillage bare ground), and fungicide schedules were examined for development of powdery mildew (caused primarily by Podosphaera xanthii), Plectosporium blight (Plectosporium tabacinum), and black rot (Didymella bryoniae), and pumpkin yield and quality. Fungicide application intervals were (i) nontreated, (ii) 7 days, (iii) 14 days, or (iv) 7 days early and 14 days late season. Pumpkin grown no-till on hairy vetch and hairy vetch plus rye cover crops had an average 36% less Plectosporium blight and 50% less black rot than those grown conventional tillage on bare ground. Powdery mildew was less severe on cv. Magic Lantern, which is moderately resistant to this disease, than on susceptible cv. Wizard. Regression equations to describe the impact of disease and treatment on pumpkin fruit number, weight, and peduncle quality (healthy, intact peduncles) were developed using three-stage least squares procedure. Powdery mildew caused...Continue Reading

References

Mar 1, 1997·Archives of Environmental Health·J BörjessonS Skerfving
Oct 24, 2008·Phytopathology·N NtahimperaL V Madden
Mar 1, 1997·Phytopathology·J B RistainoC L Campbell

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Citations

Jan 6, 2016·Applied and Environmental Microbiology·Neiunna L Reed-JonesShirley A Micallef
Jul 1, 2007·Plant Disease·E G CantonwineK L Stevenson
Jul 31, 2004·Annual Review of Phytopathology·M J Jeger
Oct 24, 2008·Phytopathology·E G CantonwineK L Stevenson

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