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leaf lesions

Listing 11 - 20 from 100 for leaf lesions

Crop Diseases in Corn 1 (Purdue University)
... Northern Leaf Spot Pathogen: Fungus. Helminthosporium carbonum (Race 3) Symptoms: Narrow, small, linear to oval shaped leaf lesions. Lesion type may vary with the genotype of host and isolate. Lesions are grayish tan and surrounded by a light to darkly pigmented (usually purple) border. Chain-like leaf lesions ...
www.btny.purdue.edu

Crop Diseases in Corn 2 (Purdue University)
... Name: LEAF DISEASES CORN Disease Name: Southern Corn Leaf Blight Pathogen: Fungus. Bipolaris maydis Symptoms: Small (1/8-1/4 in), oblong leaf lesions with rounded ends and parallel sides. Lesions are ... Erwinia stewartii Symptoms: Leaf blight symptoms consist of long, irregular, pale green to yellow water-soaked streaks with wavy margins, becoming grayish brown with age. Lesions are associated with ...
www.btny.purdue.edu
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Fruit Pathology - Tree Fruit Disease Fact Sheets and Photographs
... Leaf lesions in late spring Close-up of rust pycnia on leaf lesions in late spring Fruit infection in late spring Fruit infection in late summer Close-up of rust aecia on underside of leaf in mid summer Closer view of rust aecia on underside of leaf lesions ...
www.caf.wvu.edu

Fruit Pathology - Disease Diagnostic Key
... 17a. Leaf and early fruit lesions olive to black and velvety in appearance. Maturing fruit cracked and/or misshapen and warty in appearance. APPLE SCAB (Venturia inaequalis) 17b. Leaf lesions ... lesions surrounded by a light-green halo. Lesions most apparent at leaf tips. Later the lesions drop out (shotholing). Small circular, darkened, water-soaked lesions sometimes on twigs. Small circular lesions ...
www.caf.wvu.edu
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Phomopsis is Competing for Your Grapes
... repeated to confirm the results. Only young actively growing tissue is infected. While cane and leaf lesions are common, it is infections of the rachis and berries that cause economic losses ... may have a wrinkled appearance around the spots. Later, brown or black lesions on shoots, petioles, and rachises appear. As lesions enlarge, infected tissues become brittle and break easily. Berry infection ...
www.canr.msu.edu

Spring and Summer Lawn Management Considerations for Warm-Season Turfgrasses
... , the disease can be quite destructive. Rhizoctonia leaf and sheath spot, or "hot-weather brown patch," can cause irregularly shaped leaf lesions similar to those associated with Rhizoctonia blight. This disease develops during hot, wet weather but generally does not progress beyond the leaf lesions phase. The lesions on the ...
www.ext.vt.edu

New Disease Reports - First record of Alternaria petroselini sensu lato causing leaf blight on parsley in Australia
... in Australia, an Alternaria was isolated from leaf blighted plants in Chambers Flat, Queensland and Clyde, Victoria. Symptoms included chlorotic and necrotic lesions on the leaves that spread down the ... mL deionised water). A conidial suspension (105 conidia per mL) was sprayed onto curly-leaf parsley plants (Petroselini crispum ‘Afro’) until runoff. Control plants were sprayed with sterile ...
www.bspp.org.uk

Camellia Disease and Leaf Problem
... Red Spider Mite Symptom -- Paprika-like spots develop along the central veins of the leaf. In time leaf develops a dull olive green appearance. Suggestions -- Spraying with malathon is the typical ... particular variety is an early bloomer. Branch Die Back Symptom -- a branch suddenly dies back, lesions perhaps noticeable on dead branch. Suggestions -- Prune out (and discard) the dead or dying branch ...
www.camellia.gulfcoast-gardening.com

Leaf Spot
... leaf spot which can cause severe defoliation and reduction in yield. This disease can produce flecking, leaf anthracnose and stem lesions. Gloeosporium leaf spot was first described as a stem and leaf ... infections late in the season. Stem lesions first appear on current season's growth as dark red circular to elliptical lesions around leaf scars. As the lesions enlarge, the affected stems ...
www.ces.ncsu.edu

SOY003 - Frogeye Leaf Spot of Soybean
... Lesions on leaves are circular to angular spots which vary in size from less than 1 mm to 5 mm in diameter. Lesions are first visible on the upper surface of the leaf. These lesions are distinctive in that the brown spots are surrounded by a narrow red or dark reddish-brown margin. As lesions ...
www.ces.ncsu.edu
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