Author(s):

Avinash, K Bijendra and Shivani

Abstract: Ginger is a high value cash crop being cultivated all across the world including India. India is the highest producer and exporter of ginger. In India it is cultivated mainly in all states including Uttarakhand where it is mainly grown by small and marginal farmers on which their livelihood depends and cultivated in almost all the districts of Uttarakhand. Although it is a high value cash crop but its productivity is very low and the reason seems to be continuous use of degenerated seed rhizomes which are prone to various diseases, insect-pests and nematodes. Among these, rhizome rot caused by multitude of pathogens is a complex and one of the major limiting factors in successful cultivation of ginger. During present investigation, in order to establish the etiology of disease, infected rhizomes showing symptoms of rhizome rot were collected from the ginger growing areas of Kumaon region during crop season 2015 and brought to laboratory for isolation of pathogens. Fifteen isolates of Fusarium and two isolates of Pythium were isolated on Potato Dextrose Agar. Of the 17 isolates, isolate no. 6 of Fusarium sp. (Kotabagh isolate) and isolate no. 16 of Pythium sp. (Champawat isolate) were proved to be pathogenic under glasshouse conditions. These isolates were sent to Indian Type Culture Collection, Division of Plant Pathology, Indian Agriculture Research Institute, New Delhi for further confirmation and identification up to species level. These isolates were identified as Fusarium acuminatum (Ellis and Everh.) and Pythium aphanidermatum (Edson) Fitzp. In addition to these, six nematodes viz; Meloidogyne spp., Helicotylenchus spp., Pratylenchus spp., Tylenchorhynchus spp., Haplolaimus spp. and Criconemoides spp. were also extracted from the soil collected from Kotabagh, Haldwani, Bindukhatta and Bazpur. During field visits maggots and white grub were also noticed in the soil near infected plants.

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