New chemistry for rhizoctonia root rot of snap bean

R. T. McMillan, Jr.

Abstract


The bush snap bean, Phaseolus vulgaris L, is subject to Rhizoctonia root rot in most of the tropical, subtropical, and temperate areas of the world where it is grown. Bean root rot, caused by the fungus Rhizoctonia solani, is a serious disease for winter snap bean production in south Florida each year. Four row plots of snap bean cv. 'Sprite' were seeded in a randomized complete block with 4 replicates and 2 treatments. The fungicides, Folicur (tebuconazole) and Medallion (fludioxinil) were applied as foliar sprays at a rate equivalent to that obtained in 100 gallons of water per acre on a 14-day schedule. The bean plants were evaluated for root rot at harvest. The chemical Folicur provided significantly fewer plants with root rot than Medallion and the untreated check. There was no significant difference between Folicur at 4 and 6 oz for root rot control. However, there was a significant difference between Folicur at 4 and 6 oz, the control and Medallion at one and 2 oz for root rot control. The total marketable yield was significantly higher for Folicur at 4 and 6 oz as compared to the control and Medallion at one and 2 oz.

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283