Efficacy of pendimethalin herbicide against Trianthema monogyna (Horse purslane) weed in cotton crop sown on ridges
2006
Kaleem, S. (Adaptive Research Farm, Dera Ghazi Khan (Pakistan). Dept. of Agronomy) | Ansar, M. (University of Arid Agriculture, Rawalpindi (Pakistan). Dept. of Agronomy) | Ali, A. | Ahmed, S.
A field study was carried out during the kharif 2003 to evaluate the efficacy of pendimethalin (Stomp 330-E) on Trianthema monogyna (horse purslane) growth and its control in cotton crop sown on ridges. Three levels of pendimethalin i.e. 2.5, 3.12 and 3.75 L ha-1 were applied in comparison to control treatment (weedy check) as a pre-emergence. The data obtained during the investigations showed differential response. Maximum reduction in weeds density m-2 was obtained with the application of pendimethalin @ 3.12 L ha-1 leading to increased growth and yield of cotton as a result of reduced competition with weed plants. The maximum seed cotton yield of 1305 kg ha-1 was obtained by the application of Stomp 33E @ 3.12 L ha-1. These findings indicate that we suspect T. monogyna resistance to Stomp 330 E (pendimethalin) owing to its repeated use in cotton. We can however, have an adequate control of the referred weed with an increased rate of the same herbicide i.e. 3.12 L ha-1 as a pre- emergence application instead of recommended dose of 2.5 L ha-1. It is further stated that it is the time to switch over to other biochemical groups to manage T. monogyna in the area.
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