Department of Horticulture, Punjab Agricultural University, Ludhiana-141004
National Symposium on “Plant Pathology in the Changing Global Scenario” held at National Bureau of Plant Genetic Resources, New Delhi on February 27–28, 2009
A study was conducted at Punjab Agricultural University, Ludhiana for integrated management of fungal diseases of kinnow mandarin during 2005–06, 2006–07 and 2007–08. For this study bio control agents (Trichoderma viride and Pseudomonas fluorescence) and fungicides (Bordeaux paste, metalaxyl, mancozeb and Al-phosetyl (aliette)) alone or in combination were used. The treatments were applied a few days before the start of monsoon and again one month after the first application. Data were recorded on number and size of lesions, severity of gummosis, feeder root rot index, per cent die back, per cent chlorotic leaves, canopy volume, per cent fruit drop and fruit number per tree. Of the various treatments bordeaux paste+T. viride followed by Al-phosetyl 0.2% foliar spray was the most effective treatment in providing a trunk lesion recovery. Feeder root rot index, per cent die back, percentage of chlorotic leaves and per cent fruit drop were also significantly lower in this treatment than the control and other treatments. Control (without any treatment) showed significantly increased lesion size, much higher feeder root rot index, per cent die back and fruit drop than all other treatments.
