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leaf spots

Listing 1 - 10 from 389 for leaf spots

Rhubarb Leaf Spots
... Leaf Spots RHUBARB LEAF SPOTS Phyllis Webb Plant Pathology Technician Janna Beckerman Extension Plant Pathologist Leaf spots are commonly found on rhubarb plants. This is more of an ... leaf spots. Symptoms Ascochyta leaf spot Leaf infection with Ascochyta rhei first appears as small, green-yellow, irregular spots that are less than one half inch in diameter on the upper leaf surface. The leaf ...
www.extension.umn.edu

Fernlea Flowers - Pests and Disease Remedies for Leaf Spots
... Disease Remedies for Leaf Spots Pests and Disease - Remedies LEAF SPOTS Fungal leaf spots Picking off diseased leaves gives adequate control. If severe, spray with a fungicide containing chlorothalonil, mancozeb, or zineb. Make sure your plant is listed on the fungicide label. Bacterial leaf spots ...
www.fernlea.com

Leaf Blight of Hawthorn, HYG-3039-96
... spots. These are the spore masses of the causal agent. They are especially evident when the leaves are wet. Causal Fungus Leaf ... spots. During May and June, spores are produced on these overwintered leaves. These spores are spread by splashing rain and initiate the disease on the current season's foliage. As the leaf spots develop, new spores are formed on the spots and rapidly ...
ohioline.osu.edu

Cucumis and Cucurbita species Disease Descriptions - Angular Leaf Spot
... Leaf Spot Angular Leaf Spot (bacterium - Pseudomonas syringae pv. lacrymans): This disease appears on leaves, stems and fruit. Spots are small, angular, straw-colored and watersoaked. Leaf spots often dry and fall out giving the leaf ...
plantpathology.tamu.edu

New Disease Reports - First report of Alternaria alternata causing leaf spot on Stevia rebaudiana
... infections were observed in the region of South Bengal. Symptoms initially appeared as small circular spots, light brown in colour. Later, many became irregular and dark brown to grey, while others ... or zones. On severely infected leaves several spots coalesced to form large necrotic areas. On older leaves concentric spots were more common at the tips. Leaf spots varied from 2-18 mm (Fig. 1 ...
www.bspp.org.uk

New Disease Reports - First report of Bipolaris leaf blight of coconut (Cocos nucifera) caused by Bipolaris incurvata in mainland India
... expanded and became circular or oval shaped, brown spots with a dark brown border, often surrounded by yellow halo. As the disease developed, these leaf spots coalesced (Fig. 2). In due course, the ... Rao SC, 1988. Leaf Spot disease of coconut incited by Bipolaris incurvata (Bernad) Alcorn. Current Science 57, 674-675. Uchida JY, Aragaki M, 1991. Bipolaris and Exserohilum leaf spots. In: Chase AR, ...
www.bspp.org.uk
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Leaf Spot
... Leaf Spot Leaf Diseases of Blueberry W.O. Cline, Extension Plant Pathologist Leaf spot diseases cause considerable damage each year to blueberries in North Carolina. Most damage is caused by anthracnose and septoria leaf spots ... Oil) in early season sprays actually increases leaf spots, probably by damaging the protective waxes on the leaf surface that normally block fungal penetration. Summer ...
www.ces.ncsu.edu

ODIN011 - Entomosporium Leaf Spot on Red Tip
... spots on both the upper and lower surfaces of young expanding leaves are the first symptoms of Entomosporium leaf spot. Numerous small spots may coalesce into large maroon blotches on heavily diseased leaves. Leaf spots ... of each leaf spot. Spots similar to those on the leaves can develop on leaf petioles and tender stem growth during prolonged periods of cool, wet weather. Low levels of leaf spot ...
www.ces.ncsu.edu
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Entomosporium Leaf Spot of Photinia
... and mountain ash (Sorbus sitchensis). Fig. 1. Leaf spots on photinia caused by Entomosporium mespili. (Photo by R. C. Lambe) Fig. 2. Close-up of leaf spots showing acervuli, the spore-producing structures ... . Sindermann-Md. Dept. of Ag.). Symptoms Leaf spots on photinia first appear as minute, slightly raised dots on either surface of the leaf. Older spots have a slightly depressed center with raised ...
www.ext.vt.edu

Cherry Leaf Spot, HYG-3021-95
... purple spots appear on the upper surface of the leaf. Spots gradually enlarge to about l/4 inch in diameter and turn reddish-brown. Lesions may emerge to produce large, irregular spots. Whitish-pink masses of sticky spores (conidia) form within the spots ...
ohioline.osu.edu




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