Isolation and evaluation of microbial antagonists against postharvest fungal diseases of sweet potato and yam

A study was conducted to collect, isolate and screen potential microbial antagonists against postharvest fungal diseases of sweet potato and yam. Findings showed that in vitro evaluation of microbial antagonists against five postharvest pathogens showed that the most promising fungal antagonists wer...

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Bibliographic Details
Published inHighlights '99 (Philippines)
Main Authors Palomar, M.K, Salamat, E.E, Palermo, V.G, Edurise, G.M. (Visayas State Coll. of Agriculture, Baybay, Leyte (Philippines))
Format Journal Article
LanguageEnglish
Published Los Banos, Laguna (Philippines) PCARRD-DOST 2000
Subjects
BATATA
BOTRYODIPLODIA THEOBROMAE
CORTICIUM ROLFSII
EVALUACION
EVALUATION
EXPERIMENTACION IN VITRO
EXPERIMENTATION IN VITRO
FUSARIUM SOLANI
IGNAME
IN VITRO EXPERIMENTATION
ISOLATION
MACROPHOMINA PHASEOLINA
MICROBIAL PESTICIDES
NAMES
PATATE DOUCE
PESTICIDE MICROBIEN
PLAGUICIDAS MICROBIANOS
RHIZOPUS
SWEET POTATOES
TRICHODERMA
YAMS
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Summary:A study was conducted to collect, isolate and screen potential microbial antagonists against postharvest fungal diseases of sweet potato and yam. Findings showed that in vitro evaluation of microbial antagonists against five postharvest pathogens showed that the most promising fungal antagonists were mostly Trichoderma isolates (9 isolates against Botrydiplodia theobromae and Fusarium solani; 7 isolates to Sclerotium rolfsii; 6 isolates to Macrophomina phaseolina; and 0 isolate to Rhizopus sp.). All antagonist arrested colony growth of the postharvest pathogens through mycelial collapse. Microscopic examination of fungal growth inhibition showed shortened hyphae with closely spaced septa. In vivo screening of 11 promising fungal isolates using sweet potato roots as hosts showed high percentage disease control (66.7 to 88.9) of B. theobromae, M. phaseolina, S. rolfsii and F. solani. Supression of lession development in wounded yam tubers compared to the control ranged from 12.8 to 28.9 mm depending on antagonist used. Antagonism of Trichoderma from healthy cassava tubers (FI45) and sweet potato tissue culture (FITC) to B. theobromae and M. phaseolina, FI45 and Trichoderma from yam to S. rolfsii were consistent for both in vitro and in vivo using sweet potato as hosts
Bibliography:2001100547
J11
ISSN:0116-9440