irregularly shaped areas of disease on plant foliage.

leaf blotch (Wikipedia)

Leaf blotch may refer to:

  • Leaf blotch miner moth (Acrocercops brongniardella), a moth species found in Europe and North America
  • Septoria leaf blotch - Zymoseptoria tritici/Mycosphaerella graminicola, a plant pathogen that is difficult to control due to resistance to multiple fungicides
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