PRE AND POST CONTROL OF WEEDY RICE AND SELECTED RICE WEEDS WITH PREMIX OF IMAZAPIC AND IMAZAPYR AT DIFFERENT RATIOS

Authors

  • DILIPKUMAR MASILAMANY Rice Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), MARDI Seberang Perai, 13200 Kepala Batas, Pulau Pinang, Malaysia
  • ERWAN SHAH SHARI Rice Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), MARDI Seberang Perai, 13200 Kepala Batas, Pulau Pinang, Malaysia
  • NG LEE CHUEN School of Food Science and Technology, Universiti Malaysia Terengganu, 21300 Kuala Terengganu, Terengganu, Malaysia
  • CHUAH TSE SENG Faculty of Plantation and Agrotechnology, Universiti Teknologi MARA, UiTM Arau, 02600 Arau, Perlis, Malaysia
  • BHAGIRATH SINGH CHAUNAN The Centre for Crop Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI) and School of Agriculture and Food Sciences (SAFS), The University of Queensland, Gatton 4343, Queensland, Australia

Keywords:

Herbicide tolerant rice, weedy rice, herbicide formulation, Clearfield® rice, imidazolinone herbicide

Abstract

Field experiments were conducted in the rice fields of the Malaysian Agricultural Research and Development Institute in 2018 and 2019, to determine the efficacy of two commercial premix herbicides consisting of imazapic and imazapyr at 70:30 (formulation 1) and 30:70 (formulation 2) applied singly or in sequence for control of weedy rice and other rice weeds. Formulation 1 was applied as PRE at the 0 to 1-leaf stage of weedy rice while formulation 2 was applied as POST at the 3 to 4-leaf stage of weedy rice. Formulation 1 applied PRE at 150 g ai ha-1 with or without sequential application of formulation 2 applied POST at 75 or 150 g ai ha-1 provided complete inhibition of weedy rice. The same rate of formulation 1 applied PRE highly reduced weed density and dry weight of Monochoria vaginalis (99%) and Fimbristylis quinquangularis (93%) as compared to weedy check plots. Formulation 2 applied POST at 150 g ai ha-1 providing lower weed density and dry weight reduction of weedy rice (59 to 65%), M. vaginalis (80 to 81%), and F. quinquangularis (56 to 64%) as compared to those observed in formulation 1 applied PRE at 150 g ai ha-1. These results suggest that although formulations 1 and 2 share the same active ingredients, excellent control of weedy rice and rice weeds could only be achieved with PRE application of formulation 1 at 150 g ai ha-1.

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Published

31-12-2021

How to Cite

MASILAMANY, D. ., SHARI, E. S., CHUEN, N. L., SENG, C. T., & CHAUNAN, B. S. (2021). PRE AND POST CONTROL OF WEEDY RICE AND SELECTED RICE WEEDS WITH PREMIX OF IMAZAPIC AND IMAZAPYR AT DIFFERENT RATIOS. Malaysian Applied Biology, 50(3), 87–93. Retrieved from https://jms.mabjournal.com/index.php/mab/article/view/2012

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Section

Research Articles