CLEMSON — Recent algid acclimate beyond South Carolina may advance to problems with white cast on winter vegetables, Clemson University experts say.
White mold, additionally accepted as Sclerotinia, is a bane that infects added than 350 breed of plants, including collard, kale, cabbage, broccoli, parsley, carrot, bill and potato. Cast affection arise on blossoms, stems, leaves and pods. Typically, white cast infects plants during the winter, bounce or summer. It may not be noticed as it develops. White cast bane releases spores back the acclimate is cool. These spores can be agitated by the wind and affect added plants.
Scouting is important said Anthony “Tony” Keinath, Clemson vegetable pathologist at the Clemson Coastal Research and Education Center. Back aloof for white mold, it is important to analysis the stems as water-soaked stems, or genitalia of stems, may be the aboriginal evidence growers detect.
“Other affection accommodate a white close cottony advance on stems, blade stems, bake-apple and bulb crowns,” Keinath said. “Other affection accommodate bedimmed lesions on areas a the acme (top) of the plant.”
Plant injury, either by freezing or automated damage, makes accessible entries for white cast to affect plants. Both cold-damaged tissue and afflicted tissue may be straw-colored or bleached.
Once plants become infected, white cast is difficult to control, said Powell Smith, Clemson Extension entomologist in Lexington County.
“The bane that creates white cast can survive in the clay for years,” Smith said. “Once a bulb is infected, white cast cannot be stopped.”
Spring crops could be in crisis as well. Wind can draft spores from the bane and affect added fields or gardens.
If white cast is found, it can be ascendancy by:
Overwintered affected crops should be sprayed now with one of the afterward fungicides:
According to Keinath, fungicides in FRAC Group 7 cannot be rotated with anniversary other. Rovral cannot be acclimated on abounding brassica greens. Organic growers can use the biofungicide Contans. This biofungicide works bigger back activated a few weeks afore the sclerotia germinate.
For added advice about which plants can be sprayed with the fungicides listed in the table above, see the 2018 Southeastern U.S. Vegetable Crop Handbook. Download the white cast factsheet: White Cast 2018.
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