When is best to use pre-emergent and post-emergent chemcials, and can you mix the two chemicals together?
First, yes you definitely can mix pre- and post-emergent herbicides for a single application of both, and this is commonly recommended and even addressed on many herbicide product labels. The best example, perhaps, is Roundup, which has label directions for tank mixing with a wide variety of other herbicides. There may also be directions on some product labels that could prohibit mixing with other products, so it is very important always to read the full label before using any pesticides. They are not all going to say the same things, and if you miss some fine print on a label you could be using that product improperly, leading either to problems with your control program or even a citation by a regulatory inspector. This is not lecturing you specifically, but just general bl... Read more
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Please note, Mr. Pest Control is answering questions supplied by PMP customers across North America. His answers are generated from industry and manufacturer-provided information. The answer may not be specific to the laws and regulations for your State, Province, Territory or Country. In addition, products mentioned may not be registered and or available in all areas. Always check with your local Univar office for specific information to your area. Always read and follow label directions.