National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Powdery mildew disease appeared for the first time in field-grown Dahlia (Dahlia variabilis) in Himachal Pradesh, India. With the advancement of the disease, the infected plants withered and died. In order to investigate the causal organism of this symptom disease, fungus was morphologically studied. The fungus showed conidiophore with85-118 X 6-10µm in size, composed of subcylindrical foot cell with a single constriction at the base, and 2-4 immature conidia in chains formed in basipetal succession. Conidia that were hyaline, barrel-shaped or ellipsoid or doliform, borne in chains of three to four and without distinct fibrosin bodies measuring 29-52µm X 14-19µm.The germination of conidia occurred terminally or sub terminally with moderately 43+8µm long germ tubes and swollen appressorium. The sexual morph (chasmothecia) of this powdery mildew was not found. These morphological characteristics confirmed the identification of powdery mildew causal organism as the anamorph of Golovinomyces cichoracearum (DC.) V.P. Heluta (syn. Erysiphe cichoracearum DC). This is the first report on the occurrence of powdery mildew on Dahlia (D. variabilis) caused by G. cichoracearum in Himachal Pradesh, India.
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