2024年1月5日 · Cherry leaf spot, caused by the fungus Blumeriella jaapii (formerly Coccomyces hiemali), attacks the leaves, leaf stems, fruit, and fruit stems of tart, sweet, and English Morello cherries. The disease first emerges on upper sides of leaves as tiny, red to purple, circular spots. After the leaves become infected, they turn yellow and fall.

Cherry leaf spot can be a devastating disease for tart cherries. Leaf spot can be severe in one area and absent a few miles away. Leaf spots are first purple but eventually turn brown. The center of the spot may fall out and leave small holes in the leaf. Leaves with many leaf spots turn yellow and fall off the tree. Trees that lose many leaves:

Flat Apple Virus. Causative agent: Cherry Rasp Leaf Virus (CRLV). Vector: Dagger nematodes, Xiphinema americanum; Can also spread through contaminated budwood during propagation. Crops affected: Apple, Cherry; Disease description: Apple fruits become flattened from both the stem and calyx sides of fruit.

Cherry Mottle Leaf. Dappled leaves are the principal symptom of Cherry mottle leaf virus; severe strains also cause strap-like leaves to develop. The virus retards tree growth, and when severe, the fruit can lack flavor and ripen later. Cherry mottle leaf virus is transmitted by budding, grafting and microscopic eriophyid mites.

Cherry viruses and virus-like problems such as phytoplasmas are common in orchards throughout Oregon. They range from benign to lethal. The most serious viruses spread quickly throughout a growing region, significantly reducing fruit quality and …

Cherry leaf spot (Blumeriella jaapii) is a fungal disease which infects cherries and plums. Sweet, sour, and ornamental cherries are susceptible to the disease, being most prevalent in sour cherries. The variety of sour cherries that is the most susceptible are the English morello cherries.

2011年7月12日 · Growers should look closely to determine if it is cherry leaf spot, bacterial canker, virus or phytotoxicity that is causing defoliation in their blocks (see Several potential causes for leaf loss in tart cherry article). Cherry leaf spot forms small, purple spots that first appear on the upper surface of leaves; white to pink spore masses ...

Leaf spot is one of the important fungal diseases on cherry trees in the United States. The disease mainly affects the leaves; the pathogen will cause early defoliation under severe infection, which affects fruit maturing and color development.

Cherry Leaf Spot (Shothole), caused by Blumeriella jaapii, (formerly known as Coccomyces hiemalis) anamorph Phloeosporella padi, is the most important fungal disease of cherry wherever cherries are grown. Plums are susceptible as well.

Cherry leaf spot is a fungal disease that infects leaves primarily on tart cherries and to a lesser extent on sweet cherries. The fungus overwinters on dropped leaves that were infected in the previous season. In the spring, the fungus forms fruiting bodies (apothe-cia) on infected leaves from the previous season that reside on the orchard floor.