Crater Rot (Rhizoctonia).
At weekly intervals, alternate
azoxystrobin (Quadris--6.2 - 15.4 oz 2.08F/A or Amistar--2-5 oz 80WDG/A, with chlorothalonil (Bravo, Echo, Equus)--2-3 pt 6F/A or OLF.
Pink Rot.
Use chlorothalonil, 2 to 3 pints 6F per acre, shortly after plants emerge and repeat on a 7-day schedule.
PreplantThe following biological fungicide has been tested in some states; however, limited information is available on effectiveness in the Mid-Atlantic region. Apply 3 to 4 months prior to the onset of disease to allow the active agent to reduce inoculum levels of sclerotia in the soil. Following application, incorporate to a depth of 1 to 2 inches; however, to avoid the chance of infesting the upper soil layer with untreated sclerotia from the lower soil layer, do not plowbetween treatment and planting times.
Contans--2-4 lb 5.3WG/A
Leaf Blights.
Begin applications in seedbed and continue every 7 to 10 days until harvest.
Alternate azoxystrobin (Quadris--9.2 - 15.4 oz 2.08F/A or Amistar--3-5 oz 80WDG/A) with one of the following:
chlorothalonil (Bravo, Echo, Equus)--2-3 pt 6F/A or OLF, or
copper, fixed--manufacturer's recommendation, or
Tilt--4 fl oz 42E/A, or
Fusarium Yellows.
Attempt to keep the farm free of the fungus. Do not obtain any plants from infested areas.
Information provided is intended for consideration by the user, but is not intended to be a recommendation. Production decisions should be based on consideration of many types of information (scientific, experiential, economic, legal, etc.) available to the user.
Where trade names are used no discrimination is intended, and no endorsement by the Cooperative Extension Service is implied.
Dr. Alan A. MacNab, Professor, Plant Pathology
Penn State College of Agricultural Sciences
211 Buckhout Lab, University Park, PA 16802
Updated: Nov, 2005; EMH
Loaded: Nov, 2005; EMH