Can I reuse diluted Chlorothalonil?

bdank · June 8, 2013

Is it okay to save and reuse the diluted Chlorothalonil that might be leftover after I spray my tomatoes?

Rockporter · June 8, 2013

I do, but don't know if I am supposed to or not. I usually use it within three days or so if I am respraying to control a problem. I do rinse the wand though and put a lid on the container until I am ready to reuse it.

b54red · June 8, 2013

It is already diluted some in the original packaging. I don't know if the much greater dilution affects it or not. I would reuse it if I didn't have to keep it too long. I usually don't have any left over and if I do I spray it on roses or something else that can use it.

Bill

bdank · June 8, 2013

I'm putting mine in a hose end sprayer so I'm not diluting it fully. I only dilute it's volume by half so it doesn't clog the sprayer. It so expensive that I hate to waste any of it. I would put it in another container and store it in my cool basement until I could use it about a week later. Does anyone see why this might be a problem?

travis · June 8, 2013

I vaguely remember something like an E. coli or salmonella outbreak in California field grown vegetables traced back to diluted Chlorothalonil (Bravo, Daconil, etc.) left too long in spray tanks. Farmers often use water drawn from outdoor, open air tanks or ponds that may vector salmonella due to carp or turtle populations. But then the pre-diluted spray bottle Daconil you buy of the shelf may be sterile or contain some sort of antibacterial in the solution. I don't know.

http://www.caps.20m.com/bacteria.htm

JerryRVA · June 11, 2013

Some fungicides break down quickly in highly alkaline water. Ideal water ph for mixing chemicals is 4 to 6. Water that runs close to 8 can degrade products like Captan in little as 30 minutes according to MSU extension.

I would not keep it over if you are spraying every 5-7 days. Mix enough to use the same day for max effectiveness or spray other labeled plants to not waste the chemical.

Rosemania.com sells a nice set of odd size spoon measures down to 1/16 teaspoon so you can mix very small amounts and not have left over spray.

June 8, 2013	#1
bdank Tomatovillian™ Join Date: Mar 2009 Location: Virginia Posts: 51	Can I reuse diluted Chlorothalonil? Is it okay to save and reuse the diluted Chlorothalonil that might be leftover after I spray my tomatoes?

June 8, 2013	#2
Rockporter Tomatovillian™ Join Date: Feb 2012 Location: Texas Coastal Bend Posts: 3,205	I do, but don't know if I am supposed to or not. I usually use it within three days or so if I am respraying to control a problem. I do rinse the wand though and put a lid on the container until I am ready to reuse it. __________________ In the spring at the end of the day you should smell like dirt ~Margaret Atwood~

June 8, 2013	#3
b54red Tomatovillian™ Join Date: Sep 2009 Location: Alabama Posts: 7,068	It is already diluted some in the original packaging. I don't know if the much greater dilution affects it or not. I would reuse it if I didn't have to keep it too long. I usually don't have any left over and if I do I spray it on roses or something else that can use it. Bill

June 8, 2013	#5
travis Tomatovillian™ Join Date: Jan 2006 Location: Evansville, IN Posts: 2,984	I vaguely remember something like an E. coli or salmonella outbreak in California field grown vegetables traced back to diluted Chlorothalonil (Bravo, Daconil, etc.) left too long in spray tanks. Farmers often use water drawn from outdoor, open air tanks or ponds that may vector salmonella due to carp or turtle populations. But then the pre-diluted spray bottle Daconil you buy of the shelf may be sterile or contain some sort of antibacterial in the solution. I don't know. http://www.caps.20m.com/bacteria.htm

June 11, 2013	#6
JerryRVA Tomatovillian™ Join Date: Sep 2007 Location: Virginia Posts: 3	Some fungicides break down quickly in highly alkaline water. Ideal water ph for mixing chemicals is 4 to 6. Water that runs close to 8 can degrade products like Captan in little as 30 minutes according to MSU extension. I would not keep it over if you are spraying every 5-7 days. Mix enough to use the same day for max effectiveness or spray other labeled plants to not waste the chemical. Rosemania.com sells a nice set of odd size spoon measures down to 1/16 teaspoon so you can mix very small amounts and not have left over spray.