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This bit of advice is especially for spray techs “who should know this” and for applicators making decisions to apply tank-mix pesticides, adjuvants, fertilizers, etc.
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<a name="_Hlk95905809" class=""><b class=""><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(47, 84, 150);" class="">Pesticide Safety…“I should know this”<o:p class=""></o:p></span></b></a></div>
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<span class=""><b class=""><i class=""><span style="font-size: 12pt; font-family: Arial, sans-serif;" class="">Compatibility Jar Tests. Why Can’t We All Just Get Along?<o:p class=""></o:p></span></i></b></span></div>
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<span class=""><span style="font-size: 12pt; font-family: Arial, sans-serif;" class="">By Jennifer Weber, UA Pesticide Safety Education Program<o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">I am happy to note we have another topic for the<span class="Apple-converted-space"> </span><i class="">Pesticide Safety… “I should know this”</i><span class="Apple-converted-space"> </span>series,
where we answer pesticide-related questions and provide safety information you can pass along to others.<o:p class=""></o:p></span></span></div>
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Description automatically generated" v:shapes="Picture_x0020_1" style="" class="" apple-inline="yes" id="2AE28855-368B-4D20-A65D-7A2507A67D4D" src="cid:image001.jpg@01D83EA3.CA164C80"><span class=""></span><span class=""><b class=""><i class=""><span style="font-family: Arial, sans-serif; color: rgb(46, 116, 181);" class="">Request:
I went to your “Measuring and Mixing Pesticides” presentation during the Yuma Ag Summit. I liked the jar test activity. It showed the importance of testing out the products you want to mix together to make sure they are<u class="">compatible before</u><span class="Apple-converted-space"> </span>you
load them into the tank. Will you write a short article about jar tests? I think pesticide handlers should know this.<o:p class=""></o:p></span></i></b></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">I am glad you liked the tank mixing demo and I want to thank you for the great article suggestion. How to perform compatibility jar tests before tank mixing is a perfect topic for the Pesticide
Safety… “I should know this” series.<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">I’ll start by providing a bit of background about tank mixing and compatibility concerns to bring readers up to speed with your request. I’ll wrap up the article with jar test instructions. <span class="Apple-converted-space"> </span><b class=""><i class=""><span style="color: rgb(46, 116, 181);" class=""><o:p class=""></o:p></span></i></b></span></span></div>
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<span class=""><b class=""><span style="font-family: Arial, sans-serif;" class="">Background.</span></b></span><span class=""><span style="font-family: Arial, sans-serif;" class=""><span class="Apple-converted-space"> </span>Tank mixing is when two or more
pesticides are mixed together for a single application. Tank mixing is convenient and can save time, money, and fuel if applying with an ATV or tractor.<o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">You can purchase prepared tank mixes (often referred to as premixes and prepacks) or you can mix products together yourself. However, not all pesticides are physically or chemically compatible.<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">Incompatibility could cause ingredients to gel, clump, separate or become less effective in managing the pest. Other mixtures create problems inside your spray tank, such as the formation
of heat, gas, or precipitation; or result in damage to plants treated with the products.<o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">A great source for compatibility information is the pesticide label. Some labels include details about specific combinations known to be incompatible, including problems that could occur
when adding adjuvants, such as spreaders, detergents, or drift reducing agents. Other labels contain more general compatibility statements and jar test recommendations.<o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">Not all labels include tank mixing guidance or restrictions. However, the lack of such statements doesn’t give you the green light to mix away to your heart’s content. You are responsible
for performing a jar test to ensure compatibility, even when the label doesn’t list a potential problem.<o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">A jar test is quite simple. It’s a small-scale tank mixing practice run, which allows you to see what could potentially happen if you combined the same products in your spray tank. The steps
are the following:<o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">Put on the personal protective equipment listed on the label to protect yourself from splashes or spills.<o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpMiddle" style="margin: 0in 0in 0in 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">Fill a small glass or plastic jar with water or other carrier (often fertilizer) until it is 20-50% full.<o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpMiddle" style="margin: 0in 0in 0in 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">Add products one at a time in proportionate amounts and in the proper order<span class="Apple-converted-space"> </span><i class="">(a perfect topic for another article).</i><o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpMiddle" style="margin: 0in 0in 0in 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">Lightly mix, swirl, or shake the contents in the jar.<o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpMiddle" style="margin: 0in 0in 0in 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">Look for incompatibility issues, such as heat, precipitation, ingredient separation, or clumping.<o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpMiddle" style="margin: 0in 0in 0in 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">Let the mixture sit for 10-15 minutes and check it again for any changes.<o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpMiddle" style="margin: 0in 0in 0in 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">If nothing happens and the mixture appears consistent, it is probable the products are chemically and physically compatible.<o:p class=""></o:p></span></span></li><li class="MsoListParagraphCxSpLast" style="margin: 0in 0in 8pt 0.5in; line-height: 15.399999618530273px; font-size: 11pt; font-family: Calibri, sans-serif;">
<span class=""><span style="font-family: Arial, sans-serif;" class="">Don’t forget to test the mixture out at the site for performance and plant damage issues.<o:p class=""></o:p></span></span></li></ul>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">I realize this article is an extremely brief response to the request for a description of compatibility jar tests. If you would like to dive deeper into the topic of tank mixing, jar tests,
compatibility concerns, and solutions, I have a great resource recommendation. The Purdue Pesticide Program produced a booklet called, “Avoid Tank Mixing Errors.” It is available as a pdf on the webpage:<span class="Apple-converted-space"> </span></span></span><a href="https://ppp.purdue.edu/wp-content/uploads/files/PPP-122.pdf" style="color: rgb(5, 99, 193); text-decoration: underline;" class=""><span class=""><span style="font-family: Arial, sans-serif;" class="">https://ppp.purdue.edu/wp-content/uploads/files/PPP-122.pdf</span></span><span class=""></span></a><span class=""><span style="font-family: Arial, sans-serif;" class=""><o:p class=""></o:p></span></span></div>
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<span class=""><span style="font-family: Arial, sans-serif;" class="">Is there something you know you should know, or would like others to know? If so, send me your requests and questions by email</span></span><a href="mailto:jennyweber@arizona.edu" style="color: rgb(5, 99, 193); text-decoration: underline;" class=""><span class=""><span style="font-family: Arial, sans-serif;" class="">jennyweber@arizona.edu</span></span><span class=""></span></a><span class=""><span class="MsoHyperlink" style="color: rgb(5, 99, 193); text-decoration: underline;"><span style="font-family: Arial, sans-serif;" class=""><span class="Apple-converted-space"> </span>or<span class="Apple-converted-space"> </span></span></span></span><span class=""><span style="font-family: Arial, sans-serif;" class="">phone
(602) 827-8222. I’ll be happy to add them to the<span class="Apple-converted-space"> </span><b class=""><i class="">Pesticide Safety… “I should know this”</i></b><span class="Apple-converted-space"> </span>series.</span></span><span class=""></span><span style="font-family: Arial, sans-serif;" class=""><o:p class=""></o:p></span></div>
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<b class=""><span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">Jennifer Weber<o:p class=""></o:p></span></b></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">Pesticide Safety Education Program<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">Maricopa County Cooperative Extension<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">THE UNIVERSITY OF ARIZONA<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">MARICOPA COUNTY COOPERATIVE EXTENSION<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">4341 E. Broadway Road<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">Phoenix, AZ 85040-8807<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">Office: (602) 827-8222<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class=""><a href="mailto:jennyweber@arizona.edu" style="color: rgb(5, 99, 193); text-decoration: underline;" class=""><span style="color: rgb(5, 99, 193);" class="">jennyweber@arizona.edu</span></a><o:p class=""></o:p></span></div>
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Kai Umeda</div>
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Interim County Extension Director<br class="">
Area Extension Agent, Turfgrass Science<br class="">
The University of Arizona<br class="">
Maricopa County Cooperative Extension<br class="">
4341 East Broadway Road<br class="">
Phoenix, AZ 85040<br class="">
602-827-8214 (office)<br class="">
602-377-8292 (fax)<br class="">
602-377-5042 (cell)<br class="">
<a href="https://turf.arizona.edu" class="">https://turf.arizona.edu</a></div>
<div style="text-align: start; text-indent: 0px;"><a href="https://extension.arizona.edu/maricopa" class="">https://extension.arizona.edu/maricopa</a></div>
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