Potential of Fusarium spp. for biocontrol of downy mildew of grapes



Five Fusarium species viz. Fusarium delphinoides (MCC 1343), F. brachygibbosum (MCC 1344),
F. pseudonygamai (MCC 1345, MCC 1346) and a Fusarium sp. (MCC 1347) isolated from Plasmopara viticola collected from
vineyards were used for the studies. In in vitro studies, all Fusarium species coiled around P. viticola sporangiophores and
caused distortion of sporangia. Pre-treatment of leaf discs with Fusarium species reduced sporangial production of P. viticola
by 60 to 75%. Extracellular lytic enzymes screening showed that all five species produced glucanase, chitinase and protease
enzymes. In the small scale field trial the five species significantly reduced downy mildew incidence on leaves and bunch as
compare untreated control. The area under disease progress curce (AUDPC) ranged from 199.25 to 212.41 for leaves and
29.69 to 55.79 for bunch in Fusarium treated vines. The AUDPC in untreated control was 331.47 on leaves and 185.32 on
bunch. These Fusarium species show potential for biological control of downy mildew of grapes.

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