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Alternaria alternata, leaf spot pathogen of Ocimum gratissimum plant. a,b: host-pathogen interaction showing conidiophores formed on host epidemis; c,e,f,g: conidia d: attachment of conidia Scale bars a-g = 20 μm.
Source publication
A new leaf spot disease was observed during the 2014 on Ocimum gratissimum in the BSIP Garden of Uttar Pradesh (India), causing significant damage to the host. The symptoms produced by the associated fungus consisted of necrotic dark brown, circular to sub-circular, up to 5 mm spots on both surfaces of the leaves. A fungus having distinct dictyospo...
Context in source publication
Context 1
... cells integrated, terminal, polytretic, scars thickened. Conidia simple, acropleurogenous, solitary to catenate, dry, obclavate to ellipsoidal to ovoid, rostrum present (upto 20 µm), 3-7 transversely septate and 2-5 obliquely septate, brown, base obtuse, hilum thickened, 15-60 ×7-18 µm (Figure 2). ...
Citations
... The symptoms started from middle of the leaves as small light brown, circular to sub circular spots but in some spots coalesce to form necrotic spots and cover large area. Similar symptoms were reported by Kumar et al. (2016) [7] and Garibaldi et al. (2011) [6] that the disease affects 10% of 60 day old plants and 40% of 5-month-old plants. The brownblack lesions often surrounded by a yellow halo developed from the margins and tips of the upper side of older leaves, leading to the progressive defoliation of plants, followed by plant death. ...
... The symptoms started from middle of the leaves as small light brown, circular to sub circular spots but in some spots coalesce to form necrotic spots and cover large area. Similar symptoms were reported by Kumar et al. (2016) [7] and Garibaldi et al. (2011) [6] that the disease affects 10% of 60 day old plants and 40% of 5-month-old plants. The brownblack lesions often surrounded by a yellow halo developed from the margins and tips of the upper side of older leaves, leading to the progressive defoliation of plants, followed by plant death. ...
