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

• Published in: Pest management science Vol. 70; no. 1; pp. 156 - 162
• Main Authors: Koo, Suk‐Jin, Hwang, Ki‐Hwan, Jeon, Man‐Seok, Kim, Sung‐Hun, Lim, Jongsoo, Lee, Dong‐Guk, Cho, Nam‐Gyu
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 2014; Wiley; Wiley Subscription Services, Inc
• Subjects: Agrostis stolonifera var. palustris; annual bluegrass; Biological and medical sciences; creeping bentgrass; flowering; Fundamental and applied biological sciences. Psychology; greenhouses; herbicidal properties; Herbicides; Herbicides - pharmacology; Insect control; Insecticides; Isoxazoles - pharmacology; leaves; Lolium perenne; methiozolin; MRC-01; Parasitic plants. Weeds; Phytopathology. Animal pests. Plant and forest protection; Poa annua; Poa pratensis; Poaceae - drug effects; Poaceae - growth & development; roots; soil; soil treatment; spring; Thiophenes - pharmacology; turf grasses; turf herbicide; Turfgrasses; Weed Control; Weeds; Zoysia japonica; Monocotyledones; annual bluegrass; Agrostis stolonifera; Isoxazole derivatives; Pesticides; Poa annua; creeping bentgrass; Herbicide; Turf; methiozolin; Gramineae; Angiospermae; MRC-01; Herbaceous plant; Spermatophyta; turf herbicide
• ISSN: 1526-498X; 1526-4998
• DOI: 10.1002/ps.3541

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