Biology of Microtubulin Assembly Inhibitors Pyridines

Dithiopyr is a pre-emergence and early postemergence herbicide primarily used in turf, ornamentals and Oryza in the United States, Canada, Japan, China, Aus- 

Modem Crop Protection Compounds. Edited by W. Kramer and U. Schirmer Copyright 2007 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim ISBN 978-3-527-31496-6 

Applications of Dithiopyr to paddy grown Oryza are targeted to control Echino-chloa spp. Dithiopyr can be formulated into several different formulations, including an emulsion in water (EW) containing 240 g a.i. an emulsifiable concentrate (EC) up to 120 g a.i. and a wettable powder (WP) with 40% a.i. In addition, granular formulations are available. 

Most species of cool-season and warm-season turfgrasses are tolerant when the root system is well estabhshed. However, some species (such as Agrostis tenuis) and some varieties (such as Cynodon. dactylon x C. transvaalensis Tlf een ) are not tolerant. Dithiopyr should not be applied to new perennial turf until the root system is well established [10). It should also not be apphed to sod within three months of harvest. Dithiopyr s effect on rooting of estabhshed turf ss species was shown to be minimal and not significantly different than most other pre-emergent herbicides with an MAI mode of action [11,12). 

Thiazopyr is a pre-emergence herbicide that is currently used in non-crop areas, tree, vine and Oryza crops and has demonstrated selectivity in Medicago spp., Gossypium spp., Arachis spp.. Glycine spp., and Saccharum spp. [13-15). It is effective on most annual grasses and certain broadleaf weeds. Thiazopyr is presently registered in 13 countries in North America, Latin America, Europe, Australia and Asia. 

---