| Cherry leafspot |
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| Blumerilla jaapii |
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Plant hosts
- Major hosts: Prunus avium (sweet cherry), Prunus cerasus (sour cherry)
- Minor hosts: Prunus americana (apricot), Prunus armeniaca (apricot), Prunus cerasifera (myrobalan plum), Prunus domestica (plum), Prunus fruticosa (dwarf cherry), Prunus mahaleb (mahaleb cherry), Prunus padus (bird cherry), Prunus pennsylvanica, Prunus serotina (black cherry), Prunus serrulata (Japanese flowering cherry), Prunus virginiana (common chokecherrytree)
To view larger picture click on image.
Image provided by Andrej Kunca, National Forest Centre, Slovakia, Slovak Republic.
Means of movement and dispersal
Plant parts liable to carry the pest in trade and transport:
- Leaves: spores and hyphae are born internally and externally. Hyphae is visible to naked eye.
- Stems: spores and hyphae are born internally and externally. Hyphae is invisible.
Plant parts not known to carry the pest in trade and transport:
- Bark.
- Bulbs, tubers, corms and rhizomes.
- Fruits.
- Growing medium accompanying plants.
- Flowers.
- Seedlings and micropropagated plants.
- Roots.
- Seeds.
- Wood.
Symptoms
On sour cherry leaves, variously colored spots develop on the upper surface. The spots or lesion rapidly enlarges, becoming brown or purple, and dies from the center outward. Infected spots are irregular or round and occur over the entire leaf surface. Individual spots never become large. They merge together to kill large areas of the leaf. Spot development precedes yellowing and leaf dropping. The area adjacent to the spot may remain green while the rest of the leaf turns yellow. Diseased leaf tissue may separate from healthy tissue and give the leaf a shothole appearance.
On sweet cherry leaves, spots often are larger and nearly circular. Cream-colored fungal spore masses appear on the lower leaf surface associated with the spots on both sweet and sour cherries. On fruit stems, infections sometimes girdle the stem to cause a fruit drop. While infections occur on the fruit, they are less common than on foliage.
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