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  1. Melampsora Rust

    https://ohioline.osu.edu/factsheet/plpath-tree-08

    known as poplar leaf rust, is a foliar rust disease that has been a large problem for trees in the genus ... willows, in the United States and throughout the world. The disease is caused by several fungal pathogens ... addition to species of Saxifraga (rockfoils) and Ribe s (currants and gooseberries). The disease was ...

  2. Barley Yellow Dwarf of Wheat, Oats, and Barley

    https://ohioline.osu.edu/factsheet/plpath-cer-01

    patches within fields (Fig. 1). Distribution of diseased plants depends on the flight of winged aphids ... Plant Pathology *Corresponding author: paul.661@osu.edu (330-263-3842) Barley yellow dwarf (BYD) disease ... cultivated. This disease is the most widely distributed and economically most important virus disease of ...

  3. Soybean Rust

    https://ohioline.osu.edu/factsheet/plpath-soy-2

    Soybean rust (SBR), caused by the fungus Phakopsora pachyrhizi, is one of the most important diseases of ... favorable conditions and can cause severe defoliation. In regions where the disease has been reported, yield ... urediniospores and teliospores. Urediniospores are pale yellow-brown to salmon colored and have some ...

  4. White Rot and Botryosphaeria Canker of Apple

    https://ohioline.osu.edu/factsheet/plpath-fru-42

    canker phase of the disease is most severe in trees weakened by drought, winter injury, sunscald, poor ... pruning, low or unbalanced nutrition, and other plant diseases. The fruit rot phase can be sporadic in ... to be affected than other varieties. Symptoms Fruit At first, small, reddish-brown spots appear ...

  5. Beech Bark Disease

    https://ohioline.osu.edu/factsheet/plpath-tree-09

    Department of Plant Pathology Beech bark disease (BBD) is a devastating disease of American beech (Fagus ... the state. Disease progress projections show that it will likely be found throughout Ohio by the mid ... 2020s. Disease Development and Symptoms The scale insects appear as “white wool” on the trunks of ...

  6. Bitter Rot of Grape

    https://ohioline.osu.edu/factsheet/plpath-fru-08

    spots Small, circular, whitish spot, which is soon surrounded by a brown ring Fungal fruiting bodies on ... Pathology Bitter rot has been recognized as a disease of grapes since 1887. The name was derived from the ... infected with bitter rot, the wine may be undrinkable. The disease is more common in the southern grape ...

  7. Hops Downy Mildew

    https://ohioline.osu.edu/factsheet/plpath-fru-49

    destructive disease of hops (Humulus lupulus) in the Midwest and Northeastern United States. Downy mildew is ... mild temperatures. The disease is systemic and can cause significant yield and quality losses annually. ... Farm. Disease Development and Symptoms The downy mildew pathogen survives the winter in dormant buds, ...

  8. Black Rot and Frogeye Leaf Spot of Apple

    https://ohioline.osu.edu/factsheet/plpath-fru-07

    develop a series of brown and black concentric bands or rings. The rotted fruit finally turns black. The ... dark-brown concentric rings and a purple margin giving it a “frogeye” appearance. Black pycnidia, like those ... leaf spot are phases of a widespread and damaging disease of apple and crabapple. The fruit rot phase ...

  9. Viral Diseases of Plants

    https://ohioline.osu.edu/factsheet/plpath-gen-5

    colorful) names based on the disease they cause—for example, tobacco ring spot, watermelon mosaic, barley ... provide an overview of key concepts in plant pathology. Plant pathology is the study of plant disease ... intracellular (inside cells) pathogenic particles that infect other living organisms. Human diseases caused by ...

  10. Starting a 4-H Teen Leader Group 

    https://ohioline.osu.edu/factsheet/4h-53

    Ohio State University Extension, Brown County  The following information is a guide for starting, ...

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