Metribuzin
chemical compound
Metribuzin (4-amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5(4H)-one) is a herbicide used both pre- and post-emergently in crops including soy bean, potatoes, tomatoes, barley, chickpeas, faba beans, lupins, lentils, vetch, blade wheat and sugar cane.
It is registered for use in Australia and India.
Mechanism
It destroys cells by inhibiting photosynthesis by disrupting photosystem II, which makes metribuzin's HRAC classification Group C1, Group C (global, Aus), Group 5 (numeric).
Herbicidal uptake in the plant is mostly by the roots, with some through the leaves. Metribuzin translocates upward, destroying cells. Symptoms on affected weeds occur in 7 to 30 days: chlorosis, followed by desiccation.
Application
Metribuzin can be applied via a boom spray at 80 to 100 litres per hectare, and will be rain-fast after 6 hours. Moisture or rainfall within a fortnight improves its efficacy if used as a post-emergent; pre-emergent use requires soil incorporation (such as by a plough) within 12 hours. Recommended application rates go from 75 g/Ha to 380 g/Ha (0.067-0.34 lb/acre). It has been sold formulated as wettable granules, and can be compatibly mixed with glyphosate, trifluralin, diflufenican, chlorsulfuron, metsulfuron and pendimethalin.
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This entry incorporates text from “Metribuzin” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.