BIOHERBICIDES AS A SOURCES FOR WEED CONTROL, THROUGHSMOTHERING CROPS AND USE OF PLANT EXTRACTSS. KrishnaprabuAbstract A field experiment was conducted during 2015 at Experimental Farm, AnnamalaiUniversity,Annamalainagar to observe the weed smothering ability of different crops and also to evaluate the bioherbicidalpotential of plant extracts on weeds. The study revealed that among the crops, significantlylowest population of different categories of weeds were found under black gram while highest populationwas recorded under sesame. Among the weed management practices, hand weeding at 20 DAS resulted inlowest population of all categories of weeds at 30 DAS. Among the botanical plant extracts, Ageratumconyzoides extract 5% (w/v) recorded lowest sedge and broad-leaved weed population while lowest grassyweed population was recorded under Ocimum sanctum extract 5% (w/v). The highest weed control efficiencywas recorded under hand weeding treatment followed by fenoxaprop-p-ethyl while among the botanicalplant extract, Ageratum conyzoides recorded the highest.
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