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Effects of MT-101 and NOP on germination and seedling growth of hemp sesbania and rice

Published online by Cambridge University Press:  20 January 2017

Kangetsu Hirase  and
William T. Molin
William T. Molin
Affiliation:
Southern Weed Science Research Unit, USDA-ARS, 141 Experiment Station Road, Stoneville, MS 38776
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Abstract

The effects of MT-101 and its herbicidally active form, NOP, on the germination and seedling growth of hemp sesbania and rice were investigated. MT-101 decreased the germination of hemp sesbania by 57 and 90% at 0.05 and 0.5 mM, respectively, 1 d after treatment (DAT) in petri dishes. The germination, however, recovered such that there was no significant difference between treatments 4 to 6 DAT. NOP completely inhibited the germination of hemp sesbania at both 0.05 and 0.5 mM 1 DAT. However, germination also similarly recovered, and there was no difference between treatments 4 to 6 DAT. Neither MT-101 nor NOP decreased the germination of rice 3 to 6 DAT. In greenhouse trials preemergence (PRE) application of MT-101 at 2.25 kg ai ha−1 decreased the density (number of plants pot−1), plant height, and dry weight of hemp sesbania by 85, 67, and 91%, respectively. When applied postemergence (POST), MT-101 at 2.25 kg ha−1 decreased the density, plant height, and dry weight by a maximum of 58, 61, and 82%, respectively, indicating that MT-101 may have greater activity when applied PRE. NOP had greater activity than MT-101 on hemp sesbania. NOP at 2.25 kg ai ha−1 decreased the density, plant height, and dry weight of hemp sesbania 99, 78, and 97%, respectively, with PRE application. A POST application of NOP at 2.25 kg ha−1 decreased the dry weight of hemp sesbania 91 to 94%. A PRE application of NOP at 2.25 kg ha−1 decreased the dry weight of rice by 58%. Rice was not affected by POST applications of MT-101 but was affected slightly by NOP. These results suggest that MT-101 is a possible weed control agent in rice.

Keywords

MT-101, (naproanilide—common name approved by the Japanese Ministry for Agriculture, Forestry and Fisheries), 2-(2-naphthyloxy)propionanilideNOP, 2-(2-naphthyloxy) propionic acidhemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A. W. Hill SEBEXrice, Oryza sativa L. ‘Lemont’cotton, Gossypium hirsutum L. ‘Deltapine 5415’Herbicidal efficacycrop injurydry weightdensityplant height
Type
Research Article
Information
Weed Science , Volume 50 , Issue 3 , June 2002 , pp. 386 - 391
Copyright
Copyright © Weed Science Society of America 

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