摘要：AbstractFusarium oxysporum, a fungal plant pathogen, causes severe wilting and heavy losses in cotton. Present research was planned to appraise the weed extracts ofParthenium hysterophorus,Chenopodium album,Canada thistleandPhalaris minoragainstF. oxysporum. Morphological identification ofF. oxysporumwas done by observing white cottony mycelium with dark-purple undersurface on growth media and oval to ellipsoid/kidney shaped oval tapering and three septate spores. Molecular characterization was done by amplifying internal transcribed spacer region using the ITS universal primers, ITS1 and ITS4. The weed extract with concentrations of 5%, 10%, 15% and 20% were applied by using food poison techniques under complete randomized design. Data was taken 3, 5 and 7 days after inoculation ofF. oxysporumon potato dextrose agar (PDA).P. hysterophorusshowed maximum antifungal response (97%) againstF. oxysporumwhereas other treatments effectively inhibited the pathogen growth on PDA media. Tebuconazole, a fungicide, was used as positive control.Trichoderma harzianumshowed 98% inhibition ofF. oxysporumon PDA. Consortium ofTrichoderma harzianum + weed extracts was applied in infected roots of cotton grown in pots under complete randomized design. No disease was observed in treatmentP. hysterophorus + T. harzianumwhereas maximum disease was calculated (50%) in other treatments as compared to control (100%).
