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Jemarquezg from Saint Johns, Fl writes

How early can I apply Gallery 75 DF Specialty Herbicide if I'm targeting chamberbitter?

, this weed germinates late spring, early summer. If I apply mid March that'd be more than 60 days before germination, should I re-apply say early June?, I didn't see any temperature restriction in the label, is there any?

Answer:

Chamberbitter (also called mimosa, gripeweed, niruri) germinates when temperatures are warm, around 70 degrees F. You would need to apply Gallery 75 DF at the rate of at least 1 lb per Acre (0.38 oz per 1,000 sq ft) to prevent this weed from germinating. You can reappyl at 60 day intervals as needed, as long as you do not exceed 4 lbs per Acre per year, per the product label. The only temperature restriction we would recommend is that you should not apply pre-emergents when the ground is frozen, near freezing temperatures, or water-logged. So if you make a February or March application, then you could reapply at least 60 days from that. 

Another great tool to help prevent this weed in ornamental beds is to keep a 2-4" layer of mulch in the beds to prevent these seeds from being able to germinate. Here are some articles with additional relevant tips and information:

http://blogs.ifas.ufl.edu/santarosaco/monthly-garden-tips/ 

https://ask.extension.org/questions/258303

http://extension.uga.edu/content/dam/extension-county-offices/lowndes-county/anr/chamberbitter.pdf

Answer last updated on: 02/09/2018

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