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Sustainability 2016, 8(4), 293;

Silicon Soil Amendments for Suppressing Powdery Mildew on Pumpkin

Department of Plant Biology, Rutgers University, New Brunswick, NJ 08901, USA
Author to whom correspondence should be addressed.
Academic Editor: Kevin Murphy
Received: 16 February 2016 / Revised: 3 March 2016 / Accepted: 15 March 2016 / Published: 25 March 2016
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A greenhouse experiment was conducted with Cucurbita pepo L. “Howden” pumpkin to compare the effectiveness of various soil amendments for providing Si nutrition, improving soil fertility, and suppressing powdery mildew (Podosphaera xanthii). A sandy loam soil with an initial soil pH of 4.5 was left unamended or amended with various liming materials or silicon sources. Calcite limestone, dolomite limestone, wollastonite, CaMg silicate slag, and wood ash were similarly effective liming materials for neutralizing soil acidity, but Montanagrow™ and glacial rock flour were not shown to be effective liming materials. Powdery mildew disease incidence and severity was visually scored on the foliage. Disease development was inversely related to Si concentration in vine tissue. Wollastonite was the most effective amendment at increasing Si uptake and for suppressing powdery mildew disease and glacial rock flour was not effective. View Full-Text
Keywords: wollastonite; soil fertility; plant pathology wollastonite; soil fertility; plant pathology

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Lepolu Torlon, J.; Heckman, J.R.; Simon, J.E.; Wyenandt, C.A. Silicon Soil Amendments for Suppressing Powdery Mildew on Pumpkin. Sustainability 2016, 8, 293.

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