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Vapam: metam sodium

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > Vapam: metam sodium
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names
Vapam
Formulation Sn
Guaranteed active concentration 380 g/L
Groups  27
Ontario Schedule 3
Winter Storage C
Chemical Family Thiocarbamate.
Crop and/or Non-Crop Registrations Field and greenhouse seedbeds. Field-replant sites of fruits, vegetables, tobacco, ornamentals and forest-tree stock.
Sensitive Weeds Most scarified weed seeds and freshly vegetative parts including rhizomes and germinating seedlings.
Basis of Selectivity  Most plant parts are sensitive. Crops are not planted until all fumigant has dissipated from the soil. With moisture, methyl isothiocyanate gas is released, which kills most scarified seeds and fleshy vegetative parts including rhizomes and germinating seedlings.
Application Methods Apply uniformly using injectors, water or other incorporation tools to carry the product to the desired soil depth. May be applied via the irrigation system. No gas-proof cover is required unless the soil is very porous, however, a sprinkler application of water should be used to provide a surface "water seal".
Residual Activity 10-40 days depending on soil temperature and the amount of organic matter present in the soil. Persistence is greatest at low temperatures and high levels of organic matter. Planting may take place 12-16 days after the treatment and following a lettuce-seedling bioassay that indicates no injury.
Unique Characteristics Also controls nematodes, soil fungi and soil insects. All traces of toxic gases must be dissipated from the treated soil before planting or plant injury may occur.
Manufacturer / Registrant United Agri Products

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