{"id":1682,"date":"2010-02-23T15:14:22","date_gmt":"2010-02-23T20:14:22","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=1682"},"modified":"2019-01-24T17:38:15","modified_gmt":"2019-01-24T17:38:15","slug":"callisto-information","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/weeds\/callisto-information\/","title":{"rendered":"Callisto Herbicide Information"},"content":{"rendered":"<div>\n<ul>\n<li>There is high concern about using Callisto\u00ae repeatedly year after year, as weed resistance occurred in some other crops after just 7 years of using it. Growers are being encouraged to rotate with herbicides from other classes of chemistry, and not to use Callisto\u00ae each year if at all possible.<\/li>\n<li>Cranberries are highly tolerant of the active ingredient in Callisto\u00ae\u00a0(mesotrione)\u00a0\u2013 Cranberry is highly tolerant because it is capable of rapidly metabolizing the mesotrione,\u00a0but some growers out west have reported \u2018some\u2019 cranberry blossom damage as a result of the particular surfactant that might be\u00a0used in conjunction with it, if used during bloom.<\/li>\n<li>88% of the applied herbicide is absorbed within just 3 hours, and the dry-time (rainfast time) is 4 hours.<\/li>\n<li>It has pre and post-emergent activity on a wide range of weed species.<\/li>\n<li>Callisto\u00ae is absorbed by roots, stems and leaves, so it is translocated throughout the plant. Be careful not to use too much water when applying it, so that it does not soak into the ground to a depth deeper than the root zone of the weeds you are targeting.<\/li>\n<\/ul>\n<\/div>\n<hr \/>\n<div><em>The following information about Callisto\u00ae was largely compiled from Wisconsin\u2019s Cranberry Crop Management Newsletter (June\u00a02007) containing information from Teryl Roper, UW-Madison Extension Horticulturist (now retired), and Jed Colquhoun, UW-Madison Extension Weed\u00a0Specialist:<\/em><\/div>\n<hr \/>\n<div><strong>Activity:<\/strong> Callisto\u00ae is a bleaching type herbicide, comprised of the active ingredient, mesotrione, which is a naturally-derived\u00a0compound produced by a plant called Callistemon. \u00a0Mesotrione inhibits the building of a yellow plant carotenoid (pigment) which\u00a0functions as a sun-screen to protect a plant&#8217;s chlorophyll &#8212; so without that sun-screen protection, susceptible plants treated with Callisto\u00ae\u00a0will turn white or yellow. Callisto\u00ae has both pre-emergent and post-emergent weed control activity. When applied before germination of\u00a0annual weeds the seedlings take up the herbicide from the soil resulting in death.\u00a0 When applied post-emergent the herbicide is taken up through the foliage. Thus, irrigation immediately following a post-emergent\u00a0application is not recommended. In bearing beds, Callisto\u00ae can be applied after the bud-break stage but before the fruit set stage. In\u00a0non-bearing beds, Callisto\u00ae can be applied after the bud-break stage but not less than 45 days before flooding in fall or winter,\u00a0according to the rules established for the Wisconsin label. \u00a0Now that the full label is available, some of these time and rate rules could\u00a0be different, so that label will need to be examined thoroughly before using the product.<\/div>\n<hr \/>\n<div><strong>Weeds controlled:<\/strong> Callisto\u00ae is effective against a large array of weeds, including: smartweed (ladysthumb), carpetweed, ragweed, pigweed, birdsfoot trefoil, violet, marsh St. johnswort, buttercup, and many others. \u00a0Also, on\u00a0the Section 18 label for Washington State, the &#8220;cranberry application directions&#8221; paragraph includes rushes, sedges and\u00a0yellow loosestrife as some of its target weeds, suggesting that the material must have some noteworthy activity against\u00a0those plants as well. Yellow loosestrife is one that has been particularly problematic on cranberry beds in Maine in recent years, and\u00a0for which there has been a shortage of materials to use against it. According to Dr. Kim Patten, at Washington State\u00a0University Extension, Callisto\u00ae will not kill yellow loosestrife outright, but will weaken it and stunt it, so perhaps after\u00a0continued annual use of Callisto\u00ae for two or three years, the loosestrife could be eliminated.<\/div>\n<hr \/>\n<div><strong>Rates:<\/strong> As of 2018 <strong>(always check the label)<\/strong>, the maximum application rate for Callisto\u00ae is 8 fl oz\/acre\/application with no more\u00a0than two applications per season. Thus, the maximum annual application is 16 fl oz\/acre. Split applications are to be at least 14 days\u00a0apart. \u00a0As a spot treatment, use it in 20-30 gallons of water, as follows:\u00a0 Mix 0.8 tsp in 1 gallon water for 4 oz\/30-gallon-water rate, 1.9 tsp in 1 gallon of water for the 8 oz\/30-gallon-water rate, or for a very concentrated solution for targeting woody weeds such as poison ivy, use 5 Tbsp of Callisto\u00ae per gallon up to a maximum of 5.3 gallons of solution applied per acre per application.\u00a0 Add nonionic\u00a0surfactant (0.25% v:v or 1.9 tsp per gallon) or COC (1% v:v or 2.5 Tbsp\/gal) with all postemergence applications, regardless of Callisto\u00ae\u00a0rate.<\/div>\n<hr \/>\n<div><strong>Application:<\/strong> Since Callisto\u00ae is a very active herbicide it is critical that application be made with a carefully calibrated sprayer.\u00a0Also, because Callisto\u00ae is expensive, many of the applications are going to be spot applications with a backpack or hand-held sprayer.\u00a0These sprayers must also be calibrated. Calibration of hand sprayers is determined by the walking speed of the applicator and the\u00a0discharge rate from the nozzle along with the concentration of the material in the tank. Use great care in spot-treating. The difference\u00a0between an 8-oz application and an 80-oz application is only seconds on the trigger. Spot treatments made to runoff will exceed the\u00a0maximum application rate.<\/div>\n<hr \/>\n<div><strong>Worker Protection Standards:<\/strong> These are not listed on the various state Section 18 Exemptions (Wisconsin&#8217;s and Washington&#8217;s,\u00a0for example). That is one reason why it is critically important to read the package label. Callisto\u00ae has a 12-hour re-entry interval and a 45-day pre-harvest interval. Applicators and handlers must wear at least:<\/div>\n<div>\n<ul>\n<li>Long-sleeved shirt and long pants.<\/li>\n<li>Shoes plus socks.<\/li>\n<li>Chemical resistant gloves (Category A).<\/li>\n<\/ul>\n<\/div>\n<hr \/>\n<div><strong>Pesticide interactions: <\/strong>Wisconsin\u2019s Section 18 exemption did not mention tank-mixing Callisto\u00ae with any other pesticides. In\u00a0addition, the recommendation from Syngenta was that Callisto\u00ae not be applied within 7 days (either before or after) of an\u00a0organophosphate or carbamate insecticide such as Lorsban, because, in corn, insecticide interactions have been seen.\u00a0This recommendation is expected to be removed from the label soon, however, because this was tested in cranberries in Massachusetts with no evidence of any harmful interactions.<\/div>\n<div>\n<hr \/>\n<p><strong>Summary: <\/strong>Research plots in Wisconsin (and in Washington State) showed Callisto\u00ae to be a safe and effective herbicide for control of weeds in\u00a0cranberry plantings. In those test trials, researchers did not observe a reduction of cranberry yield from Callisto\u00ae application. However,\u00a0as with any new pesticide, it would be advisable to test this product in a small area first, given that research plots cannot account for all\u00a0climatic conditions, management practices, cranberry varieties and bed age, and other variables that differ greatly among beds.<\/p>\n<hr \/>\n<p><span style=\"color: #6b6b6b\"><strong>Disclaimer:<\/strong> Pesticide registration status is subject to change and varies from state to state; therefore the author and the University of Maine Cooperative Extension cannot assume liability for any pesticide recommendations. It is the responsibility of the pesticide applicator to verify the registration status of any pesticide <em>before<\/em> applying it. <strong>The label is the law!<\/strong> <em>Always<\/em> read and follow the label when applying pesticides. Use of product names does not imply endorsement.<\/span><\/p>\n<hr \/>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>There is high concern about using Callisto\u00ae repeatedly year after year, as weed resistance occurred in some other crops after just 7 years of using it. Growers are being encouraged to rotate with herbicides from other classes of chemistry, and not to use Callisto\u00ae each year if at all possible. Cranberries are highly tolerant of [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":470,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-1682","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Callisto Herbicide Information - Cooperative Extension: Cranberries - University of Maine Cooperative Extension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/weeds\/callisto-information\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Callisto Herbicide Information - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"There is high concern about using Callisto\u00ae repeatedly year after year, as weed resistance occurred in some other crops after just 7 years of using it. 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