leaf spot

Listing 1 - 10 from 317 for leaf spot

Leaf Spot
... none on the last flush of growth in late summer. Symptoms and Disease Cycles Gloeosporium Leaf Spot or Anthracnose (Gloeosporium minus) Most commercial blueberry plantings in eastern North Carolina are affected ... first appear on current season's growth as dark red circular to elliptical lesions around leaf scars. As the lesions enlarge, the affected stems turn brown and eventually become gray and ...
www.ces.ncsu.edu

Strawberry Leaf Spot Diseases, HYG-3015-95
... will become weakened resulting in increased susceptibility to root diseases and winter injury. The three major leaf diseases that are caused by fungi have a similar disease cycle and are controlled in a ... summer. Petioles, calyxes and fruit may also be infected earlier in the season. Control Leaf spot and leaf scorch are controlled most effectively by the use of resistant varieties. The following ...
ohioline.osu.edu

Cherry Leaf Spot, HYG-3021-95
... causing fruit to ripen unevenly. Spots usually do not form on fruit. Causal Organism Cherry leaf spot is caused by the fungus, Blumeriella jaapii (previously called Coccomyces hiemalis). The fungus overwinters ... green, healthy leaves and serve as primary inoculum for disease. The ascospores stick to the leaf surface, germinate in a film of water, and within several hours at the proper temperature ...
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Cucumis and Cucurbita species Disease Descriptions - Alternaria Leaf Spot
Cucumis and Cucurbita species Disease Descriptions - Alternaria Leaf Spot Alternaria Leaf Spot Symptoms on Cantaloupe Alternaria Leaf Spot (fungus - Alternaria cucumerina): Small, circular watersoaked spots first appear on the leaves, later enlarging to one and one-half inch or more in diameter. Definite concentric rings and margins appear giving the diseased area a "bull's eye" appearance. The ...
plantpathology.tamu.edu

Cucumis and Cucurbita species Disease Descriptions - Angular Leaf Spot
... stems and fruit. Spots are small, angular, straw-colored and watersoaked. Leaf spots often dry and fall out giving the leaf a "shot-hole" appearance, similar to those caused by anthracnose. ... temperatures remain high. Crop rotation with non-cucurbit crops is helpful for control of angular leaf spot. Application of copper fungicide will assist in control. Cucurbits, however, are sensitive to copper ...
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ODIN011 - Entomosporium Leaf Spot on Red Tip
... Pathologist [General Information] [Symptoms] [Disease Cycle] [Control] [Back to Ornamental Disease Notes] [Other Resources] General Information Leaf spot, caused by the fungus Entomosporium maculatum, is a widespread and destructive disease of red tip ... Leaf Spot Control Fungicide Rate per gallon Rate per 100 gallons Banner 1 tsp. 12-20 fl. oz. Daconil 2787 75W* 1 1/2 tbs. 1 1/2 lb. Daconil 2787 4.1F ...
www.ces.ncsu.edu

Angular Leaf Spot of Cucumber
... Pathology, Physiology and Weed Science, Virginia Tech Publication Number: 450-700, Posted December 2000 Angular leaf spot of cucurbits is caused by the bacterium Pseudomonas syringae pv. lachrymans. Although the bacterium ... easily spread in the field by cultivation equipment, harvesters, and by wind-blown rain. Angular leaf spot is most active between 75-82F (24-28C) and is favored by high humidity ...
www.ext.vt.edu

Entomosporium Leaf Spot of Photinia
... of Photinia Entomosporium Leaf Spot of Photinia Author: Mary Ann Hansen, Extension Plant Pathologist, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech Publication Number: 450-609, Posted May 2000 ... 1). On the juvenile, reddish colored foliage of P. x fraseri, the tiny, new, circular leaf spots are a darker red than the surrounding healthy tissue. Older necrotic spots (up to ...
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New Disease Reports - First report of Rhizoctonia solani causing leaf spot of Adhatoda vasica
... , vis--vis water-sprayed control plants were covered with polythene bags for 36 hours. Typical leaf spot symptoms started developing after 10 days. The fungus was successfully reisolated of from artificially ... plants including medicinal plants (Janardhanan, 2002), this is the first report of R. solani causing leaf spot of A. vasica in India and elsewhere. The field symptoms show that the disease is ...
www.bspp.org.uk

New Disease Reports - First report of Alternaria alternata causing leaf spot on Stevia rebaudiana
... citrus leprosis virus (CiLV-C) in Honduras, Central America First report of Alternaria alternata causing leaf spot on Stevia rebaudiana C.K. Maiti, S. Sen, R. Acharya and K. Acharya* Molecular ... West Bengal, India for financial assistance. References Ishiba C, Yokoyama T, Tani T, 1982. Black spot disease of Steviae caused by Alternaria steviae, new species. Annals of the Phytopathological Society of ...
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