S. R. SalakinkopEranna E.2020-02-192020-02-192015-09http://krishikosh.egranth.ac.in/handle/1/5810143245ABSTRACT :- A field experiment to study the evaluation of some allelopathic weed leaf extracts and herbicides for weed control in chrysanthemum was carried out at Main Agricultural Research Station, Dharwad during kharif 2014. The experiment consisted of 12 treatment combinations involving two pre emergence herbicides viz., pendimethalin 30 EC 1.0 kg a.i./ha and alachlor 50 EC 1.5 kg a.i./ha as one factor. Four weed leaf extracts (pre-emergence) viz., Parthenium hysterophorus @ 10 per cent (W1), Cassia sericea @ 10 per cent (W2), Chromolaena odorata leaf extract @ 10 per cent (W3) and combined leaf extract (W4) of W1 + W2 + W3 each at equal concentration of 3.33% as another factor. The experiment was laid out in factorial randomized complete block design with three replications. The combined pre-emergence application of either pendimethalin or alachlor along with combination of all the weed leaf extracts (H1W4:9 and H2W4:9) recorded good control of weeds. The crop toxicity rating observed at 7, 14 and after 21 days after pre-emergence application of herbicides and weed leaf extracts revealed that they caused no injury on the crop growth. Application of pendimethalin 30 EC @ 1 kg a.i./ha as pre-emergence along with combination of all the weed leaf extracts (H1W4) recorded significantly lower total weed population, total dry matter accumulation of weeds, weed index and higher weed control efficiency, plant height, number of branches per plant, leaf area, leaf area index, total dry matter production, flower yield (10.82 t ha-1), net returns ( 117597 ha-1) and B C ratio (3.38). However, it was found on par with alachlor 50 EC @ 1.5 kg a.i./ha along with combination of all weed leaf extracts (H2W4) and weed free check (C1) with respect to weed control, crop growth, flower yield and yield attributesennullThesis