Efficacy of imazapyr and its mixtures against weeds under rubber


Citation

Ahmad Faiz M. A., . Efficacy of imazapyr and its mixtures against weeds under rubber. pp. 41-52. ISSN 1511-1768

Abstract

Isopropylamine salt ofimazapyr is effective against several weeds in rubber plantations but is relatively more expensive. Lower rates ofimazapyr were therefore evaluated in mixtures with other herbicides to determine whether improved weed control can be obtained. Effectiveness of the herbicide using different nozzle types and spraying equipment were also evaluated. Trials were conducted along planting strips of rubber between one to six years old against weeds comprising mainly of Ottochloa nodosa Paspalum conjugatum Axonopus compressus Borreria latifolia and Asystasia gangetica. Evaluation on efficacy of imazapyr showed weeds were susceptible at low rates of application and acceptable control could be obtained at 0.2 kg ae/ha. Imazapyr at 0.375 kg ae/ha provided more effective weed control than standard treatments with pre-mixed paraquat diuron (0.6 kg ai/ha 0.6 kg ai/ha) pre-mixed glyphosate dicamba (0.54 kg ae/ha 0.27 kg ae/ha) glufosinate ammonium (0.5 kg ai/ha) and slashing. Lower rate of imazapyr at 0.15 kg ae/ha in mixture with ametryn (0.5 kg ai/ha or 1.0 kg ai/ha) metsulfuron methyl (0.015 kg ai/ha) or pre-mixed isopropylamine salt of glyphosate isopropylamine salt of dicamba (0.18 0.09 0.36 0.18 or 0.54 0.27 kg ae/ha) improved weed control while its mixture with diuron (0.5 kg ai/ha or 1.0 kg ai/ha) provided comparable control. Addition of alachlor (0.48 kg ae/ha or 0.96 kg ae/ha) metolachlor (0.36 kg ae/ha or 0.72 kg ae/ha) or oxyfluorfen (0.12 kg ae/ha or 0.24 kg ae/ha) to imazapyr at 0.25 kg ae/ha provided comparable control to imazapyr alone. Comparison of fan hollow cone and solid cone nozzles showed comparable weed control with imazapyr at 0.375 kg ae/ha. Application of imazapyr at 0.375 kg ae/ha with the controlled droplet applicator showed improved weed control compared to the knapsack sprayer.


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Abstract

Isopropylamine salt ofimazapyr is effective against several weeds in rubber plantations but is relatively more expensive. Lower rates ofimazapyr were therefore evaluated in mixtures with other herbicides to determine whether improved weed control can be obtained. Effectiveness of the herbicide using different nozzle types and spraying equipment were also evaluated. Trials were conducted along planting strips of rubber between one to six years old against weeds comprising mainly of Ottochloa nodosa Paspalum conjugatum Axonopus compressus Borreria latifolia and Asystasia gangetica. Evaluation on efficacy of imazapyr showed weeds were susceptible at low rates of application and acceptable control could be obtained at 0.2 kg ae/ha. Imazapyr at 0.375 kg ae/ha provided more effective weed control than standard treatments with pre-mixed paraquat diuron (0.6 kg ai/ha 0.6 kg ai/ha) pre-mixed glyphosate dicamba (0.54 kg ae/ha 0.27 kg ae/ha) glufosinate ammonium (0.5 kg ai/ha) and slashing. Lower rate of imazapyr at 0.15 kg ae/ha in mixture with ametryn (0.5 kg ai/ha or 1.0 kg ai/ha) metsulfuron methyl (0.015 kg ai/ha) or pre-mixed isopropylamine salt of glyphosate isopropylamine salt of dicamba (0.18 0.09 0.36 0.18 or 0.54 0.27 kg ae/ha) improved weed control while its mixture with diuron (0.5 kg ai/ha or 1.0 kg ai/ha) provided comparable control. Addition of alachlor (0.48 kg ae/ha or 0.96 kg ae/ha) metolachlor (0.36 kg ae/ha or 0.72 kg ae/ha) or oxyfluorfen (0.12 kg ae/ha or 0.24 kg ae/ha) to imazapyr at 0.25 kg ae/ha provided comparable control to imazapyr alone. Comparison of fan hollow cone and solid cone nozzles showed comparable weed control with imazapyr at 0.375 kg ae/ha. Application of imazapyr at 0.375 kg ae/ha with the controlled droplet applicator showed improved weed control compared to the knapsack sprayer.

Additional Metadata

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Item Type: Article
AGROVOC Term: Imazapyr
AGROVOC Term: Rubber
AGROVOC Term: Weeds
AGROVOC Term: Herbicides
AGROVOC Term: Weed control
AGROVOC Term: Glyphosate
AGROVOC Term: Sprayers
AGROVOC Term: Phytotoxicity
AGROVOC Term: Eleusine indica
AGROVOC Term: Planting
Geographical Term: Malaysia
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 28 Apr 2025 03:23
URI: http://webagris.upm.edu.my/id/eprint/23169

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