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  1. 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 ...

  2. Japanese Beetle

    https://ohioline.osu.edu/factsheet/ENT-46

    like old carpet to reveal the grubs. Large populations of grubs kill the turf in irregular patches ... usually in high-quality urban turf. Beetle skeletonizing a leaf Hosts The adult beetles are general ... most commonly damage turf. The turf first appears off-color as if under water stress. Irrigating causes ...

  3. Downy Mildew of Grape

    https://ohioline.osu.edu/factsheet/plpath-fru-33

    infected leaves eventually turn brown, wither, curl and drop. The disease attacks older leaves in late ... Pathology Downy mildew is a major disease of grapes throughout the eastern United States. The fungus causes ... cotton-like growth (Figure 2). Infected tissue gradually becomes dark brown, irregular, and brittle. Severely ...

  4. Cork Spot and Bitter Pit of Apples

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

    disease usually is not serious. This is an updated version of a fact sheet originally published in 1992. ... sometimes confuse these disorders with damage resulting from insects or pathological diseases, particularly ... used in controlling post-bloom diseases and insects affecting fruit. Do not apply calcium chloride ...

  5. Fire Blight of Apples and Pears

    https://ohioline.osu.edu/factsheet/plpath-fru-22-0

    a common and very destructive bacterial disease of apples and pears (Figure 1). The disease is caused by ... (Rosaceae) family (Table 1). On apples and pears, the disease can kill blossoms, fruit, shoots, twigs, ... Crabapple Hawthorn Mountain Ash Pyracantha Quince Raspberry Spirea Disease Development Fire blight first ...

  6. Apple Powdery Mildew

    https://ohioline.osu.edu/factsheet/plpath-fru-21

    usually at the ends of branches. Small, whitish felt-like patches of fungal growth appear and quickly ... cover the entire leaf. Diseased leaves become narrow, crinkled, stunted and brittle. By mid-summer, ... fungal fruiting bodies, but their importance in the disease cycle is probably minimal. The fungus spreads ...

  7. Gray Leaf Spot of Corn

    https://ohioline.osu.edu/factsheet/plpath-cer-05

    prevalent foliar fungal diseases of corn in the state of Ohio ever since it was first reported in parts of ... into no-till fields and conditions are favorable for infection. Reports of high disease severity are ... humidity favor infect and disease development and spread. Under these conditions, yield losses ranging from ...

  8. Ohio Opportunity Zones in Community and Economic Development

    https://ohioline.osu.edu/factsheet/cdfs-4112

    Service. 2021. Opportunity Zones (web page). Reviewed or updated November 10, 2021. ...

  9. Rusts of Apple

    https://ohioline.osu.edu/factsheet/plpath-fru-02

    PLPATH-FRU-02 05/06/2016 Michael A. Ellis, Department of Plant Pathology Three rust diseases occur ... green area becomes brown and spongy. The formation of pycnia and aecia on infected fruit is rare. Apples ... crabapple. Larger, gray to brown spots form on leaves of hawthorn. Few aecia form on apple and crabapple. ...

  10. Botrytis Bunch Rot or Gray Mold of Grape

    https://ohioline.osu.edu/factsheet/plpath-fru-03

    mold grape infected grapes shriveled grapes brown grapes diseased grapes controlling grape fungus Plant ... and causes diseases on a variety of unrelated crops. Bunch rot can cause serious losses on highly ... Infection of ripe berries is the most common and destructive phase of this disease. Infected berries first ...

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