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

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

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Iron Chlorosis

  • Small, round depressed spots which may be brown, black or translucent on leaves
  • Dead plant tissue may fall out causing a "shot hole" effect
  • Newly hatched nymphs are red with black wing pads and become yellowish green with a black stripe on each wing pad as they develop
  • Adults are one half inch long, yellowish to yellow green in color with four longitudinal black stripes on the wing covers
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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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Two-spotted spider mite
Tetranychus urticae

  • White to yellow stippling on foliage
  • Heavy infestations will cause leaves to turn white, yellow and ultimately grayish bronze; premature leaf drop may occur
  • Webbing may be present
  • 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 mite...
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Powdery mildew
Erisyphe polygoni

  • White spots or blotches on leaves
  • In severe cases leaves and young shoots may be completely covered with white powdery fungal growth
  • Leaves may be stunted, curled or puckered
  • Red or purple blotches may occur on upper leaf surfaces
  • More information on powdery mildew...
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Hydrangea Chlorotic Mottle Virus (HCMV)

  • Light green, green and yellow mottling on leaves
  • Reddening and curling or deformation of leaf tissue
  • Symptoms most visible in spring and fall
  • Infects only cultivars of Hydrangea macrophylla
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Oystershell scale
Lepidosaphes ulmi

  • Light to moderate infestations show little or no symptoms
  • Severe infestations can cause chlorotic, stunted foliage
  • Dieback and cracked bark can result from heavy infestations
  • Light to dark brown, elongated, 1/10 to 1/8 inch long oyster-shell shaped scales found on bark
  • More information on oystershell scale...

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