Plant Disease (2016) 100, 125-130

Kuniaki Shishido, Hiroyuki Murakami, Daiki Kanda, Shin-ichi Fuji, Takeshi Toda and Hiromitsu Furuya (2016)
Effect of soil inoculum density and temperature on the incidence of cucumber black root rot
Plant Disease 100 (1), 125-130
Abstract: The effects of the density of Phomopsis sclerotioides in soil and other environmental factors on black root rot of cucumber were investigated. Cucumber plants were grown in soil containing P. sclerotioides at 1, 10, 100, and 1000 CFU/g. Wilt incidence from 3 to 7 weeks after transplanting was strongly correlated with P. sclerotioides density in soil (P < 0.05). Root rot of squash rootstock occurred in soil with very low inoculum densities (0.1 CFU/g), and was strongly related to P. sclerotioides density (Y = -0.3x + 1.2, R² = 0.743, P < 0.05) at 8 weeks after transplanting. Cucumber plants showed wilt symptoms in soil containing 1 CFU/g. Wilt symptoms in cucumber plants occurred 4 to 7 days earlier in soil at 22°C than in soil at 27 or 17°C. Root rot development could be predicted from the density of P. sclerotioides in soil and soil temperature. However, further studies on the effects of other environmental factors are required to test the linear model in commercial fields. This information is essential for determining the threshold pathogen density at which most control techniques, particularly those other than soil disinfection, will be effective.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Shin-ichi Fuji, Hiromitsu Furuya

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaporthe sclerotioides	Cucumber (Cucumis sativus)