Etiology and management of pod rot of mungbean [Vigna radiata (L.) Wilczek]
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Date
2022
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Punjab Agricultural University, Ludhiana
Abstract
Mungbean [Vigna radiata (L.) Wilczek] is one of the most important pulse crops cultivated in three different seasons, viz., kharif, rabi and summer. However, it is prone to large number of fungal, bacterial and viral pathogens which cause various diseases. Pod rot of mungbean [Vigna radiata (L.) Wilczek] has been emerged as serious disease problem in Punjab and adjoining states in the recent years. The disease appears as discoloration of pods simultaneously with other symptoms such as rotting, shrivling, softening and rotting of seeds in mungbean particularly in the Kharif season crop. The occurance of pod rot was observed in varying intensities on different cultivars in different districts of Punjab. Among the seven districts, the maximum disease incidence i.e. 55.59 per cent was found in Ludhiana followed by Gurdaspur (53.91%), Faridkot (52.06%), whereas the minimum disease incidence of 15.76 per cent was found in Moga. The pathogens associated with syndromes of pod rot were identified as Fusarium equiseti and Fusarium chlamydosporum through morphological as well as molecular characterization by using ITS and EF1/EF2 primers. Pathogenicity of the isolated organisms was established through Koch’s Postulates. Temperature ranges of 2535oC and pH range of 5.5-7.5 were found more conducive for the growth of F. equiseti and F. chlamydosporum as well as the pod rot disease development. Sucrose as carbon source whereas Potassium nitrate as nitrogen source was found to be more supportive for the growth of both the pathogens. Among the tested media, four i.e., Potato dextrose gar, Czapek’s dox agar, Richard’s agar, oat agar were found more supportive for the colony growth of both pathogens. Out of the seventy five mutant genotypes of mungbean screened against the pod rot under natural epiphytotic conditions, only ML 2524 showed the Resistant (R) reaction whereas forty one showed moderately resistance (MR), twenty four moderately susceptible (MS) whereas nine showed susceptible (S) reaction to pod rot disease. A combination of Trifloxystrobin + Tebuconazole (75% WG) @ 0.07 per cent followed by tebuconazole 25 EC @ 0.1 per cent were proved to be most effective under in vitro as well as in vivo conditions.
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Harwinder Singh (2022). Etiology and management of pod rot of mungbean [Vigna radiata (L.) Wilczek] (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.