000			03511nam a22002177a 4500
003			OSt
005			20240203162033.0
008			150210b xxu||||| |||| 00| 0 eng d
040			_cCPGS
082			_a633.83
100			_aPoudyal, Chanda _93859
245			_aEtiology of ginger rhizome rot complex in mid-hills of Meghalaya and its management / _cby Chanda Poudyal
260			_aUmiam : _bCPGS, CAU, _cc2014
300			_a[34], 106p. : _bill., some col. ;
440			_a[Plant Pathology, School of Crop Protection] _93860
520			_aGinger (Zingiber officinale Rosc.) is a major spice crop in India and Meghalaya is the second largest producer in the country with total production of 46.59 thousand tonnes. Rhizome rot, commonly known as soft rot is a major constraint in ginger cultivation in Meghalaya. Limited information is available on the association of organisms in rhizome rot complex from the mid-hills of Meghalaya. The present study aims at the assessment of disease incidence in mid-hills of Meghalaya, etiology and in vitro evaluation of plant extracts, bio-control agents (BCAs) and chemicals against associated pathogens of ginger rhizome rot complex. Disease incidence of rhizome rot complex was recorded in 17 villages from the Ri-Bhoi district of the state and the highest incidence was noted from Rongskiong (62.7%), Rongiari (60.8%) and Longen (60.2%) under Umling block of Ri-Bhoi district of Meghalaya. Lowest disease incidence was recorded in Nongra (0.4%) and Umet (2.4%) villages of Umsning block. The study revealed the association of Pythium myriotylum, Fusarium oxysporum, F. solani (tentatively) and Ralstonia solanacearum based on morphological, biochemical and molecular detection. In vitro evaluation of plant extracts showed that Allium sativum (3, 5 and 10%) was most effective against all the pathogens except Fusarium sp. with mean inhibition of 68.1 and 50.1% in P. myriotylum and F. oxysporum respectively and with 11.0 mm of inhibition zone in R solanacearum. F. solani was effectively suppressed by Lantana camara (40.0 %) followed by A. sativum (38.60 %). Out of six tested BCAs, Trichoderma harzianum showed maximum inhibition against all the associated fungal pathogens, viz. P. myriotylum, F. oxysporum and F. solani with inhibition of 44.5, 45.6 and 46.2 % respectively, whereas Pseudomonas fluorescens showed maximum antagonism against R. solanacearum (28.4 mm). On evaluation offour fungicides, viz. copper oxychloride, mancozeb, carbendazim and metalaxyl at the different concn. (ranging from 0.05-0.5%) against the fungal pathogens, all the chemicals showed 100% suppression of P. myriotylum at all the concn., whereas carbendazim and metalaxyl equally inhibited the mycelial growth of F. oxysporum (87.1 %) and F. solani (87.1 %.) at all the concentrations. Among all the chemicals tested against R. solanacearum, streptocycline was found highly effective with inhibition zones of 26.8, 28.6 and 32.5 mm at the test concn. of 300, 400 and 500 ppm respectively. Evaluation of plant extracts, BCAs and chemicals needs further in vivo evaluation to formulate effective management strategies against rhizome rot complex of ginger under Meghalaya conditions. Key words: Rhizome rot complex, ginger soft rot, management, Meghalaya, Mid-hills
650			_aGinger _xRhizome rot disease _zMeghalaya _93861
650			_aRhizome rot disease _xControl and management _94132
700			_aDipali Majumder _93862
942			_2ddc _cTH
999			_c4380 _d4380