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Apple - Black rot, leaf Apple - Cedar/Apple rust Apple - Fire blight Apple - Fruit blotch Apple - Vole injury Cherry - Phloeosporella Cherry - rust Cherry - Cercospora PawPaw - Leaf spot Peach - Captan Injury Peach - Leaf curl Pear - Bitter rot Plum - Pockets

Plant: Apple (Malus X domestica) Rosaseae Back to List
Disease/Disorder: "Black rot" in its leaf phase, called "Frogeye leaf spot".
Causal agent: Botryosphaeria obtusa (fungus)
Signs: Black pycnidia (spore-producing structures) in brown spots.
Symptoms: Irregular brown spots/blotches on leaves.
Total image number: 4

Plant: Apple (Malus X domestica) Rosaseae Back to List
Disease/Disorder: Cedar/Apple rust
Causal agent: Gymnosprangium juniperi-virginianae (fungus)
Signs: aecia forming on leaves and releasing spores (aeciospores) from bottom of leaf.
Symptoms: The spots on the top surface of the leaves are due to spores coming from cedar trees - the fungal stage at the bottom surface of the leaf opposite the same spot is the stage which produces spores which infect cedar trees.
Total image number: 13 (each row is from a different sample;
the 3rd row contains 5 images)

Plant: Cherry (Prunus sp.) (Rosaseae) Back to List
Disease/Disorder: Leaf spot
Causal agent: Phloeosporella padi (fungus)
Signs: Spore-producing bodies ("acervuli") may be swelled like a blister, sometimes not.
Symptoms: dark brown leaf spots with red border
Total image number: 8

Plant: Cherry (Prunus sp.) (Rosaseae) Back to List
Disease/Disorder: Rust
Causal agent: Tranzschelia (fungus)
Signs: Pustules with spores ("urediniospores") [found on same leaf as with Phloeosporella padi above]
Symptoms: raised spots surrounded by light green/white leaf tissue
Total image number: 5

Plant: Cherry (Prunus sp.) (Rosaseae) Back to List
Disease/Disorder: Leaf spot
Causal agent: Cercospora (fungus)
Signs: Spore-producing hyphae ("conidiophores") grouped in clumps.
Symptoms: reddish-brown spots which can drop out and form shot-holes.
Total image number: 8

Plant: Peach (Prunus persica) (Rosaseae) Back to List
Disease/Disorder: Fungicide injury
Causal agent: Captan and spray adjuvants (likely)
Signs:
Symptoms: Scarring or russetting likely from the Captan used and the environmental conditions and/or the amount of spray and adjuvants used. When absorbed into plant tissue, Captan can cause phytotoxicity that appears as leaf spotting, shot-holing, leaf yellowing, and fruit russetting. The risk of Captan injury is greatest when the annual spring growth flush of fruit trees coincides with an extended period of cloudy, cool, damp weather. Even when plant tissue has only a thin cuticle, captan by itself will rarely cause phytotoxicity (except to those plum and cherry varieties that are especially susceptible to Captan injury). Problems often arise, however, when Captan is mixed with other agrichemical products. Spray adjuvants that enhance the transport of Captan through the plant cuticle can greatly increase the phytotoxicity of Captan, especially when the plant cuticle is thin at the time spray is applied. Adjuvants that enhance uptake of Captan include spray oils, some spreader-stickers, and other petroleum-based carriers commonly found in products that are formulated as liquids or emulsifiable concentrates. High temps and overdosing may also contribute to russetting. Information from Dr. David Rosenberger of the Cornell University.
Total image number: 4

Plant: Peach (Prunus persica) (Rosaseae) Back to List
Disease/Disorder: Peach leaf curl
Causal agent: Taphrina deformans (fungus)
Signs:
Symptoms: Swollen, puckered light green to red leaf tissue
Total image number: 7