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Insect & Disease ID And Diagnosis Guide: Patches

By Greenhouse Grower staff|January 19, 2009

Scouting tip: After determining the problem, discard plants with contagious diseases and take appropriate control measures.

Downy mildew on salvia causes brown vein-bounded spots.

Look on the underside of leaves like this for fuzzy patches of downy mildew. Foliar nematode injury can look similar.

Round white spots on snapdragon leaves indicate impatiens necrotic spot virus (INSV).

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