necrotic spots

Listing 1 - 10 from 91 for necrotic spots

Virus Diseases of Greenhouse HYG-3065-96
... black or necrotic spot associated with the leaves or stems of a small plant or seedlings. These spots can later become larger or develop into black or necrotic ringspots ... Crop Hosts Affected Symptoms Associated with Infection Impatiens Necrotic-Spot Many, particularly hosts that attract thrips Black/necrotic ringspots, black/necrotic spots, black lesions on affected stems, wilting Cucumber Mosaic ...
ohioline.osu.edu

PEONY
... areas consisting of concentric bands of alternating dark and light green on leaves. Small necrotic spots may also form. Plants are not dwarfed. No control other than destroying infected plants. ... Leaf Spot (fungus - Alternaria spp.): Leaves may have brown purplish or reddish irregular shaped spots. Leaves may yellow, wither and fall early. Crown Gall (bacterium - Agrobacterium tumefaciens): See ...
plantpathology.tamu.edu

New Disease Reports - First report of Turnip mosaic virus on Brassicaceae crops in Turkey
... Brassicaceae crops, Brassica oleracea, Raphanus sativus and R. raphanistrum, showing mosaic, mottling, necrotic spots, malformation and chlorosis were collected from Canakkale, Balikesir and Bursa Province of ... not shown). Figure 1: Brassica oleracea var. capitata showing typical mottling and necrotic spots symptoms Figure 2: Raphanus sativus showing mosaic, malformation and chlorosis symptoms ...
www.bspp.org.uk

New Disease Reports - First report of Eggplant mottled dwarf virus in potato and tomato in Slovenia
... summer of 2003 tomato plants cv. Belle, showing unusual symptoms of distinct chlorotic spots, wrinkles on fruits and narrow, necrotic leaves, were observed in north-eastern Slovenia, about 16 km from RakiÄ ... yellowing of veins and leaf curling was observed on N. tabacum cv. White Burley and necrotic spots, starting on the bases of the leaves on N. clevelandii. These symptoms resembled those of ...
www.bspp.org.uk

New Disease Reports - First report of Alternaria tenuissima causing leaf spot and fruit rot on eggplant (Solanum melongena) in India
... Guntur district Andhra Pradesh, India. The symptoms recorded were small, circular, brown necrotic spots all over the foliage. The spots gradually enlarged in size and later became irregular in shape or remained ... with concentric rings or zones (Fig. 1). In the later stage of infection, these spots coalesced resulting in withering, extensive drying and shedding of leaves. On fruit, the symptoms ...
www.bspp.org.uk

New Disease Reports - First report of Alternaria mali causing necrotic leaf spot of apples in Turkey
... and applied to the underside of wounded leaves as described in Johnson et al., 2000. Necrotic spots were observed on the leaves 24 hours after the inoculation (Fig. 4). These results supported ... report of Alternaria necrotic leaf spot of apples caused by A.mali in Turkey. Figure 3: Necrotic spots of A. mali on leaves of inoculated young apple plant Figure 4: Necrotic spots formed on the ...
www.bspp.org.uk

New Disease Reports - First report of Bipolaris leaf blight of coconut (Cocos nucifera) caused by Bipolaris incurvata in mainland India
... were maintained at 20 ± 2°C under near UV light. Inoculated leaf pieces produced typical necrotic spots after seven days incubation. The fungus was consistently re-isolated from infected leaf pieces onto ... Alcorn. Current Science 57, 674-675. Uchida JY, Aragaki M, 1991. Bipolaris and Exserohilum leaf spots. In: Chase AR, Broschat TK, eds. Diseases and Disorders of Ornamental Palms. St. Paul, ...
www.bspp.org.uk

Crop Diseases in Wheat 1 (Purdue University)
... . Puccinia recondita f. sp. tritici Symptoms: Dry, yellow (chlorotic) flecks to red or brown-black necrotic spots on upper leaf surfaces. Conditions: Infection favored by moisture and cool temperatures (59-72 F ...
www.btny.purdue.edu

Herbicide Injury Symptoms on Corn and Soybeans (Purdue University)
... detail. Index, Search or Top of Page CORN Mode: Cell Membrane Disruptor Herbicide: Paraquat Injury: Necrotic spots Condition: Herbicide drift from nearby field, most likely a no-till field where a burndown ...
www.btny.purdue.edu

Herbicide Injury Symptoms on Corn and Soybeans (Purdue University)
... Mode: Photosynthetic Inhibitor Herbicide: Atrazine, Metribuzin Injury: Lower leaves display interveinal chlorosis with necrotic margins Condition: Carryover of atrazine or high rate of metribuzin SOYBEAN Mode: ... , Search or Top of Page CORN Mode: Cell Membrane Disruptor Herbicide: Paraquat Injury: Necrotic spots Condition: Herbicide drift from nearby field, most likely a no-till field where ...
www.btny.purdue.edu