Effect of soil cultivation and anaerobiosis on cavity spot of carrots

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Abstract
SUMMARY: Cultivating between rows and narrow beds of carrots reduced the severity of cavity spot in one year and reduced the incidence and severity in single rows in a second year on land where the disorder was endemic. Growing carrots on ridges initially reduced symptoms more than inter‐row cultivation.Soluble carbohydrates leached from carrot rootsin vitroand the quantities increased when anaerobic conditions were imposed. Untreated and cell‐free extracts of soil suspensions amended with 1% glucose and incubated anaerobically applied to carrots in the laboratory caused the outer layers of the secondary phloem to collapse resembling a cavity spot lesion. Unamended and fresh soil solutions had no effect.