plant diagnostic_database

                             Kale (Brassica oleracea var. acephala)                          


Affected Area:

Plant Information:


Kale is a very hardy member of the cabbage family, with green or purple leaves, in which the central leaves do not form a head.  Kale can tolerate a lower temperature(<40°F) and pH(5.5-6.8) than can other brassicas.  In fact frost improves the taste.  Kale can be grown like cabbage, though its culture is easier because it is not as often besieged by pests who seem to prefer some of the other brassicas.



Affecting Leaves:
Signs or Symptoms      Cause
Yellow v-shaped spots on leaf margins Black rot (Xanthomonas campestris)
Yellowish leaves, lower leaves drop; stunted plants may have twisted stems, usually occurs soon after transplanting Fusarium yellows (Fusarium oxysporum)
Yellow leaves, older leaves first, slow growth Nitrogen deficiency
Yellow leaves Cold weather
Yellow, curled leaves; stunted plants Aphids 
Brown leaves that wilt and die Harlequin bug (Margantia histrionica)
Tan to dark-brown leaf margins Heat injury
Small holes, shothole injury Flea beetles (Phyllotreta spp.)
Large holes in leaves; outer leaves riddled Cabbage worms (Pieris rapaeor Cabbage looper
Affecting Roots:
Yellow, stunted plants that wilt during bright, hot days and recover at night Cabbage root maggots

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