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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Ribes > Leaves discolored white, yellow or pale green

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Ribes > Leaves > Leaves discolored white, yellow or pale green

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Two-spotted spider mite
Tetranychus urticae

  • White to yellow stippling on foliage; leaves can appear off-green
  • Heavy infestations will cause leaves to turn white, yellow and ultimately grayish bronze
  • Premature leaf drop may occur
  • Webbing may be present, especially when heavily infested
  • Mites usually appear in late June to August; they are more prevalent in hot, dry weather
  • Adult spider mites are small(approximately 1/50 inch long) and are hard to see; they are yellow to dark red with dark spots (need magnification to see)
  • More information on two-spotted spider mites
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Powdery mildew
Phyllactina guttata

  • White, powdery spots or blotches on leaves
  • Leaves and stems may be completely covered with white, powdery fungal growth
  • Leaves may yellow and drop prematurely
  • Young leaves and shoots may be curled and twisted
  • Entire shrub may appear gray or discolored
  • More information on powdery mildew
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Non-selective herbicide injury
(Round-up, Kleen-up, and other glyphosate products)

  • Yellowing, wilting, browning leaves and eventual death of foliage and plants
  • Damage usually appears first in new tissues
  • Shrubs sprayed during the summer or fall may not have noticeable injury until the following season when leaves appear as stunted, narrow, strap-like, and chlorotic
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Plant Growth Regulator Herbicide Injury
(2,4-D, Dicamba, etc.)

  • Leaves, stems, and petioles are twisted, distorted, and/or cupped
  • Leaves may appear thick and leathery with parallel veins
  • Youngest tissue at branch ends affected
  • Distorted growth accompanied by or followed by leaves that turn brown or yellow
  • More information on Plant Growth Regulator Herbicide Injury

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