Threelobe morningglory (Ipomoea triloba) germination and response to herbicides

Chauhan, Bhagirath Singh and Abugho, Seth Bernard (2012) Threelobe morningglory (Ipomoea triloba) germination and response to herbicides. Weed Science, 60 2: 199-204. doi:10.1614/WS-D-11-00137.1

Author Chauhan, Bhagirath Singh
Abugho, Seth Bernard
Title Threelobe morningglory (Ipomoea triloba) germination and response to herbicides
Journal name Weed Science   Check publisher's open access policy
ISSN 0043-1745
Publication date 2012-01-01
Year available 2012
Sub-type Article (original research)
DOI 10.1614/WS-D-11-00137.1
Open Access Status Not yet assessed
Volume 60
Issue 2
Start page 199
End page 204
Total pages 6
Place of publication Lawrence, KS United States
Publisher Weed Science Society of America
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1110 Nursing
Abstract Experiments were conducted in the laboratory and screenhouse to determine the effects of scarification; alternating day/night temperatures; light, salt, and water stress; seed burial depth; and rice residue on seed germination and seedling emergence of threelobe morningglory, and to evaluate the response of this weed to commonly available POST herbicides in the Philippines. Germination was stimulated by seed scarification, suggesting that inhibition of germination in this species is mainly due to the hard seed coat. Germination of the scarified seeds was not influenced by the tested temperatures (alternating day/night temperatures of 25/15, 30/20, and 35/25 C) and light. The concentrations of sodium chloride, ranging from 0 to 250 mM, did not influence germination of the scarified seeds of threelobe morningglory. The osmotic potential required for 50% inhibition of maximum germination was -0.35 MPa, although some seeds germinated at -0.6 MPa. Seedling emergence was greatest for the seeds placed on the soil surface (96%), and emergence declined with increased burial depth in soil. The burial depth required for 50% inhibition of maximum emergence was 2.8 cm. No seedlings emerged from a burial depth of 6 cm or greater. Residues of up to 6 Mg ha -1 on the soil surface did not influence seedling emergence of threelobe morningglory. The herbicide 2,4-D at 400 g ai ha -1 provided excellent control of threelobe morningglory when applied at the four-leaf (100%) and six-leaf (97%) stages. However, at the eight-leaf stage, percent control was reduced to 67% and herbicide rate had to be increased twofold to achieve 95% control. The information gained from this study could contribute to developing components of integrated weed management strategies for threelobe morningglory. Soil inversion by tillage to bury weed seeds below their maximum depth of emergence and early application of an effective POST herbicide could serve as important tools for managing threelobe morningglory.
Keyword Burial Depth
Leaf stage
Water Stress
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
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