Investigations on Pomegranate Wilt Complex
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Date
2018-07
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University of Agricultural Sciences, Dharwad
Abstract
Pomegranate wilt complex caused by Ceratocystis fimbriata Ell. and Halst. and Meloidogyne incognita is one of the most important diseases, which results in complete wilting in pomegranate crop. The prevalence and severity of pomegranate wilt complex was found to be more in Koppal district (42.84%) followed by Bagalkot (34.13 %), Vijayapur (30.48%) and Gadag (27.73%). During survey, shot hole borer incidence and Root knot nematode symptoms was observed only in two districts i.e. Koppal and Bagalkot. Cultural studies revealed that oat meal agar was found to be best solid and liquid media and source of growth C. fimbriata. The
fungus showed maximum growth on PDA broth on 16th day after inoculation. Glucose and sodium nitrate were noticed to be the best carbon and nitrogen source for the mycelial growth of the fungus on liquid media, respectively. The dendogram constructed from the pooled data clearly showed that there were differences among the isolates. However, in the interaction study, greatest reduction in growth parameters like shoot and root length and shoot and root weight was observed in first inoculation with nematode followed by fungus treatment as compared to all other treatments. Among the fungicides, bio agents and botanicals tested in vitro against C. fimbriata, tricyclazole and hexaconazole among systemic fungicides, carboxin (37.5%) WP + thiram (37%) WP (Vitavax Power) among combi products and copper oxychloride among nonsystemic fungicides, T. harzianum in bioagents and ginger rhizome extract among botanicals were found superior in inhibiting the mycelial growth of C. fimbriata.