P. Suneeta*, K. Eraivan Arutkani Aiyanathan and S. Nakkeeran

Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore – 641 003, India.

ABSTRACT

An extensive study was undertaken to manage the most vigorous, polyphagous pathogen Sclerotiumrolfsii causing collar rot disease in Gerbera by utilizing nine commercial fungicides and eight novel Trichodermaspp. Under in vitro conditions,there was61.11 per cent reduction of pathogen (S. rolfsii) by T. harzianumNVTH2 and T. virideTV1 over control and was followed by T. citrinovirideNVTC1, T. citrinovirideNVTC2 and T. asperellumNVTA1 with per cent inhibition of 55.55, 54.44 and 53.33 respectively. On the other hand, commercial fungicides,tebuconazole 50%+ trifloxystrobin 25%, tebuconazole 250 EC, propioconazole 25% EC, fenamidone 10%+mancozeb 50%WG and propineb70WPreduced the growth of S. rolfsiito an extent of 100 per cent inhibition in all the tested concentrations. Combination of most effective Trichodermaspp. and fungicides had resulted in the best treatment T2against the collar rot pathogen of Gerbera under protected cultivation.

Keywords: Fungicides, Gerbera,Trichoderma spp., collar rot.