Title: Suggested measures for controlling root rot diseases of beans
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Title: Suggested measures for controlling root rot diseases of beans
Physical Description: Book
Creator: Moore, W. D.
Publisher: Plantation Field Laboratory, University of Florida
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Bibliographic ID: UF00076432
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Source Institution: University of Florida
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L Plantation Field Laboratory Mimeo Report 59-2 July 30, 1958




SUGGESTED MEASURES FOR CONTROLLING ROOT ROT DISEASES OF BEANS

by

W. D. Moore* and P. L. Thayer**


Root rots and damping-off of snap beans in the sandy soils of the
lower east coast of Florida are caused principally by Rhizoctonia solani
and several species of Pythium, These fungi are able to persist for
long period of time in the soil, actively growing on dead organic
matter or in the absence of proper environmental conditions for growth
simply existing in the dormant state. Thus Rhizoctonia and Pythium are
almost always present in the soil and are a constant threat to the bean
crop.

The greatest amount of damage occurs during germination of the seed
and shortly thereafter in the form of damping-off; often resulting in
death of a large percentage of the seedlings. Later invasions may cause
lesions on the stem at the soil level or on the primary and secondary
roots under the soil surface; however, except under very severe condi-
tions the later invasions are not fatal and may cause little loss in
yield. Fortunately control measures now available are more effective
against the early invasions by the root rotting fungi.

Extensive experimentation at the Plantation Field Laboratory has
resulted in commercial control of the root rot complex of beans by use
of the following measures:

1. All cover crops should be allowed to dry completely before they
are plowed under. Plow under cover as much as six to eight weeks in
advance of planting.

2. Spray seed and soil in a six-to eight-inch band over the furrow
at the time of planting with a 50-50 mixture of Captan and PCNB at the
rate of eight pounds per acre. This can be done by attaching a tank,
together with a small gear pump, to planter tractor and arranging spray
nozzles just above the planter shoes that will spray the liquid down
over the seed and walls of the furrows before they are covered. The
amount of liquid required per acre will vary according to the type
equipment used, the most important consideration being the use of enough
water to prevent the chemicals from clogging the nozzles.


Formerly Plant Pathologist, Plantation Field Laboratory, and co-
operative with Crops Research Division, ARS,USDA.

** Assistant Plant Pathologist, Everglades Station, Belle Glade,
Florida.




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