Chemical control of Asystasia intrusa (B1), Clidemia hirta (Don.) and Elettariopsis curtisii (Bak.) in rubber [hevea] and oil palm plantations [Malaysia]
1982
Teoh, C.H. | Toh, P.Y. | Khairudin, H.
A. intrusa is easily controlled by a wide range of post-emergence translocated herbicides, of which 2, 4-D amine applied at 125g a.e. per ha proved the best. As regeneration from seeds is very rapid, sequential applications of this herbicide will be necessary before satisfactory control applications of this herbicide will be ne necessary before satisfactory control is obtained. Three pre-emergence herbicides (ethidimuron, norflurazon and terbutryn) were tested but they did not give good control of A. intrusa emerging from seeds. C. hirta can be eradicated by application of translocated herbicides, 2, 4, 5-T butoxy can be eradicated d by application of translocated herbicides, 2, 4, 5-T butoxy ethylester (1.3 kg a.e. per ha) and formulated mixtures of 2, 4-D amine and 2, 4, 5-T. Another herbicide, triclopyr, is fast acting and very effective at 0.7 kg a.e. per ha but more expensive to apply. The following are considered most cost effective for controlling E. curtisii, a wild ginger: paraquat (0.6kg/ha) + 2, 4-D amine (2.0 kg a.e./ha) + diesel (2.8 1/ha); paraquat (0.5 kg/ha) + picloram/2, 4-D amine (1.2 kg a.e./ha) + diesel (2.8 1/ha); paraquat (0.4 kg/ha) + MSMA/MCPA/TBA (3.6 kg/ha)
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