Abstract
In vitro studies on the efficacy of Trichoderma species against phytopathogens revealed the antagonistic potential of eight different species of Trichoderma isolated from the rhizosphere soils of varied locations of Uttar Pradesh and were evaluated in vitro against the most widely occurring soil inhabiting plant pathogens viz., Fusarium oxysporum f. sp. ciceri, Alternaria solani, Phytopathora infestans, Pythium aphanidermatum, Sclerotium rolfsii, Bipolaris sorokiyana and, Rhizoctonia solani and identify the most potential and effective strains Trichoderma with high antagonistic activity. Eight species of Trichoderma highly inhibited the growth of the seven test phytopathogens by producing volatile compounds showing variability in antagonistic potential of different Trichoderma spp. against the different pathogens tested. The test antagonists grow faster than the pathogen and produced inhibition zones. These antagonistic interactions influence the incidence and severity of the disease caused by the pathogen. The present communication describes the impact of different Trichoderma spp. on growth inhibition of plant pathogens under in vitro conditions. The data revealed that Trichoderma reesei (Tr(CSAU) showed the maximum inhibition percentage of mycelial growth was recorded as against Scelerotium rolfsii (69.14%) followed by Bipolaris sorokiniana (80.33%), Alternaria brasiciae (83.3%), while, in case of remaining plant pathogens such as Pythium aphanidermatum, Fusarium oxysporum f. sp. ciceri, Trichoderma harzianum (Th.azad) were reduced the highest radial mycelium growth of Pythium aphanidermatum, Fusarium oxysporum f. sp. ciceri (85 and 80%) respectively. Apart from Trichoderma reesei and Trichoderma harzianum (Th.azad), Trichoderma viride (01PP) also inhibited the mycelial growth of Phytophthora infestans (80.83%) and Rhizoctonia solani (70.42%). Key words: Antagonism, Trichoderma, phytopathogens.
Highlights
Screening of Tricho oderma a species forr virule ence effficacy y n seven most predo ominant phy ytopath hogens s on Viipul Kumar*, Mohammad Shahid, Mukesh h Srivastav va, Anurad dha Singh, Sonika Pa andey and
Eight sp pecies of Trichoderm ma highly inhibited the growth of the seven ttest phytopathogens by y producing g volatile compounds s showing variability v in n antagonisttic potential of differen nt Trichoderm ma spp. against the different pa athogens tes sted
The high cost associated with the use of chemical to control disease caused by soil borne fungi is a limiting factor in the profitability of crop production, in this case biological control could be the best alternative
Summary
Screening of Tricho oderma a species forr virule ence effficacy y n seven most predo ominant phy ytopath hogens s on Viipul Kumar*, Mohammad Shahid, Mukesh h Srivastav va, Anurad dha Singh, Sonika Pa andey and. In vitro stud dies on the efficacy e of Tri richoderma species s again nst phytopatthogens reve ealed the antagonistic potential of o eight diffe erent specie es of Tricho oderma isollated from tthe rhizosph here soils o of varied locations of Uttar Prade esh and were e evaluated in vitro agai nst the most widely occ curring soil in nhabiting plant patho ogens viz., Fusarium oxysporum o f. Eight sp pecies of Trichoderm ma highly inhibited the growth of the seven ttest phytopathogens by y producing g volatile compounds s showing variability v in n antagonisttic potential of differen nt Trichoderm ma spp. against the different pa athogens tes sted. The tes st antagonistts grow faste er than the p pathogen and d produced iinhibition zones. These antagonis stic interactions influence the incid dence and se everity of the disease ca aused by en. The data re evealed thatt Trichoderm ma reesei (Tr(CSAU) showed the maximum inhibition pe ercentage o of mycelial g growth was recorded as s against
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