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Methiozolin [5‐(2,6‐difluorobenzyl)oxymethyl‐5‐methyl‐3,3(3‐methylthiophen‐2‐yl)‐1,2‐isoxazoline], a new annual bluegrass (Poa annua L.) herbicide for turfgrasses

Author:
Koo, Suk‐Jin, Hwang, Ki‐Hwan, Jeon, Man‐Seok, Kim, Sung‐Hun, Lim, Jongsoo, Lee, Dong‐Guk, Cho, Nam‐Gyu
Source:
Pest management science 2014 v.70 no.1 pp. 156-162
ISSN:
1526-498X
Subject:
Agrostis stolonifera var. palustris, Lolium perenne, Poa annua, Poa pratensis, Zoysia japonica, flowering, greenhouses, herbicidal properties, herbicides, leaves, roots, soil, soil treatment, spring, turf grasses
Abstract:
BACKGROUND: Selective control of annual bluegrass (Poa annual L.) has been difficult in turfgrasses. The potential of methiozolin in this area was investigated. RESULTS: Methiozolin was safe on established zoysiagrass (Zoysia japonica Steud.), creeping bentgrass (Agrostis palustris Huds.), Kentucky bluegrass (Poa pratensis L.), and perennial ryegrass (Lolium perenne L.) at 1000 g ha⁻¹, and controlled annual bluegrass with GR₅₀ values of 23, 52, 104, and 218 g ha⁻¹ at PRE, two‐, four‐ and eight‐leaf stage, respectively, in the greenhouse. When applied at early flowering, methiozolin suppressed >80% of annual bluegrass seed heads at 2000 g ha⁻¹. ¹⁴C‐Methiozolin was readily absorbed by both leaves and roots, but translocation was mainly acropetal. No herbicidal activity resulted from application to the leaf only; however, application to the soil surface only showed equivalent herbicidal activity to that of broadcast application to the leaf and soil. Methiozolin at 500 to 1000 g ha⁻¹ provided 80 to 100% control of annual bluegrass when applied in the fall with acceptable and temporary injury to creeping bentgrass, and about 60% control when applied in the spring with no bentgrass injury in the field. CONCLUSION: Methiozolin is an excellent candidate for annual bluegrass management in turfgrasses. © 2013 Society of Chemical Industry
Agid:
615812