Author(s):

K Nagapushpa, Dr. M Vijayalaxmi, Dr. M Vijaya and Dr. KB Suneetha Devi

Abstract: The current investigation was carried out at College of Horticulture, SKLTSHU, Rajendranagar, Hyderabad during 2016-2017 to study the effect of different herbicides to control the weeds in China aster varieties of Kamini and Poornima. The experiment was conducted in factorial randomized block design with factorial concept with three replications. Factor I includes two varieties Kamini (V1) and Poornima (V2), factor II includes eight treatments viz., Pendimethalin (30EC), Oxyfluorfen (25EC) and Alachlor (50EC) as pre emergence herbicides in combination with Quizalofop ethyl (10EC) as post emergence followed by hand weeding at 20 DAT. At all the crop growth stages, pre emergence application of alachlor (50EC) @ 1.0 kg a.i ha-1 followed by hand weeding recorded lowest weed density and dry weight of weeds. The highest weed control efficiency, least weed index and higher yield were noticed in pendimethalin (30EC) @ 1.0 kg a.i ha-1 followed by hand weeding. However, unweeded control recorded highest weed count, dry weight, maximum weed index and lower weed control efficiency. Among the two varieties, minimum weed count, dry weight and maximum weed control efficiency were noticed in Kamini while Poornima recorded the minimum weed index. The interaction between treatments and varieties was found significant at 20, 40 and 60 DAT. Lower weed count, dry weight and higher weed control efficiency were noticed with alachlor (50EC) @ 1.0 kg a.i ha-1+ hand weeding. However, higher weed index was recorded with pre emergence application of pendimethalin (30EC) @ 1.0 kg a.i ha-1 + hand weeding.

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