Effect of Bio-efficacy and phytotoxicity of Fluroxypyr -Meptyl for broad leaf weed control in onion (Allium cepa)

Publication Date : 01/04/2016


Author(s) :

s.deivasigamani.


Volume/Issue :
Volume 2
,
Issue 4
(04 - 2016)



Abstract :

A field experiment was conducted during kharif seasons of 2012-2013 at Department of Agronomy, Annamalai University, Tamilnadu, India. To study the effect of bio efficacy and phytotoxicity of different herbicides sprayed for broad leaf weed control in onion. The herbicides Fluroxypyr-meptyl 48EC @ 360 g.a.i (750 ml/ha) was applied at 15-20 DAP, that recorded the least weed counts, dry matter and highest weed control index of individual species viz., Amaranthus viridis, Boerhaavia diffusa, Trianthema portulacastrum, Euphorbia hirta etc. The weed dry matter production and weed control index favoring to give higher bulb yield of (80.0q/ha). Fluroxypyr-meptyl 48EC @ 324 g.a.i (675 ml/ha) and hand weeding were on par. Fluroxypyr-meptyl 48EC @ 300 g.a.i (625 ml/ha), Fluroxypyr-meptyl 48EC @252 g.a.i (525 ml/ha) and Pendimethalin 30EC@2500-3300ml/ha were next in order. No phytotoxicity symptoms was observed in the treatments including two times the recommended dose of Fluroxypyr-meptyl 48EC @ 360 g.a.i (750 ml/ha) and Fluroxypyr-meptyl 48EC @ 720 g.a.i (1499 ml/ha) in respect of leaf chlorosis, tip burning, leaf necrosis, leaf epinasty, hyponasty, vein clearing, wilting and rosetting etc.,


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