{"id":582,"date":"2010-02-05T11:47:57","date_gmt":"2010-02-05T16:47:57","guid":{"rendered":"https:\/\/extension.umaine.edu\/cranberries\/?page_id=582"},"modified":"2019-02-06T21:03:37","modified_gmt":"2019-02-06T21:03:37","slug":"may","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/cranberry-management-calendar\/may\/","title":{"rendered":"May (Maine Cranberry Management Calendar)"},"content":{"rendered":"<ul>\n<li><strong>After\u00a0terminal bud has\u00a0broken dormancy &amp;\u00a0begun to swell or\u00a0grow: <\/strong>The approximate window for spraying for <strong>Upright Dieback control<\/strong> is <strong>April 30 &#8211; May 20<\/strong>. For Washington County growers, the target window is likely a bit later (May 6 &#8211; 26). But, exact timing depends on whether the variety is early or late-season. Remember, too, that if a chlorothalonil application is used at this time, that leaves only two more available that you can use for fruit rot control. For a list of available fungicides you can use, and details about the disease, consult the <a href=\"https:\/\/extension.umaine.edu\/cranberries\/site-map\/cranberry-ipm-guide\/\">Maine Cranberry Pest Management Guide<\/a>. <strong>Note:<\/strong> Bravo\u00ae does not control upright dieback if applied later than early bloom\u2014by this time the fungus has apparently invaded shoots and is out of reach of the material. Fungicides will not cure upright dieback but will prevent the spread of the infection.<\/li>\n<li><a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/weeds\/callisto-information\/\"><strong>Callisto\u00ae<\/strong><\/a> for weeds just\u00a0starting to\u00a0emerge <em>(but avoid using it year after year so as not to encourage resistance)<\/em>: (best if\u00a0&lt;5&#8243; tall, yet growing\u00a0 actively) (~From\u00a0May to 45 days\u00a0before harvest or\u00a0flooding, and not\u00a0during bloom) Callisto\u00ae is reportedly an extremely good choice for weed control, having both pre-emergence activity as well as post-emergence activity (especially when weeds are &lt;5&#8243; tall), and you are encouraged to wait for that stage.\u00a0 If you apply too early, some weeds with vast root systems&#8211;such as cinquefoil&#8211;can quickly recover. Thus, for cinquefoil, wait until the first flush of new growth has taken place.\u00a0 The maximum application rate is 8 oz\/acre\/application; no more than two apps. per season, and split apps. need to be at least 14 days apart. Callisto\u00ae is effective against a large number of different weeds (will control most all annual broadleaf weeds if under 5&#8243; tall), but plan on several years of treatment in order to achieve permanent control of many perennial weeds, especially yellow loosestrife\/swamp candles. Birdsfoot trefoil and other Lotus members are very sensitive to Callisto\u00ae (but more difficult to control if they are completely covering over the cranberry canopy). Cranberry vines are highly tolerant of Callisto\u00ae &#8211; they can readily metabolize its active ingredient (mesotrione).<\/li>\n<li><strong>~May 14 &#8211; May 31<\/strong><strong>(vegetative buds\u00a0elongated 1\/2&#8243; and\u00a0flowering buds at\u00a0bud break stage): <a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/cranberry-tipworm\/\">Cranberry tipworm<\/a><\/strong> begins! <em>(Flies appear first, followed by eggs and larvae once new tips begin to grow)<\/em> Overwintering pupae will be hatching out into flies (the length of this period is a bit uncertain and probably varies from year to year).\u00a0 Individual flies only live for about 3 days (5 at most), so right out of the gate they are busy mating and laying eggs on the terminal leaves of uprights (mostly on the tips of brand new uprights sprouting up from the runners).\u00a0 The more dormant the upright, the less likely its chances of\u00a0being chosen for egg deposition by the female tipworm fly. Conventional wisdom is to treat at the peak of egg hatch, or slightly before that period in the case of any material that provides a good residual or has systemic activity.\u00a0 The window for either of these timings is somewhat narrow. <strong><em>See also: <\/em><\/strong><strong><a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/degree-days\/\">Degree Day Model<\/a><\/strong><\/li>\n<li><strong>~May 20th\u00a0&#8211; Early\u00a0June\u00a0(tip elongation): <\/strong>\n<ul>\n<li><strong><a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/false-armyworm\/\">False Armyworm<\/a> larvae begin (If no <a href=\"https:\/\/extension.umaine.edu\/cranberries\/wp-content\/uploads\/sites\/40\/2010\/05\/LateWater.doc\">Late Water flood<\/a> was used). <\/strong>These cutworms have been consistently found in significant numbers on Maine cranberry beds annually. The larvae feed on leaves, stems and buds (basically consume entire uprights), and get quite big when mature (2\u201d long), at which point (<em>late June into July<\/em>) they feed almost exclusively at night. <strong>Sweepnet First Dates (Average First Date\u00a0= May 24th):<\/strong> 6\/6\/97, 5\/28\/98, 5\/28\/99, 5\/24\/00, 5\/31\/01, 5\/13\/02, 5\/24\/05, 5\/25\/07, 5\/14\/08, 5\/14\/09<\/li>\n<li><strong>1st-generation <a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/insects\/blackheaded-fireworm\/\">Blackheaded fireworm<\/a><\/strong><strong> larvae begin!<\/strong> Spend some time visually scanning for upright tips with terminal leaves that have been webbed tightly together!\u00a0 Break off any tip of that sort, and carefully tease apart the terminal leaves.\u00a0 If a small larva suddenly squirms out, wriggling backwards and possibly right across your hand and down to the ground (often attached to a strand of silk)&#8230;and if this happens before you&#8217;ve even blinked, then you&#8217;ve probably encountered a fireworm larva. You should then sweep to see if you pick up any in your net.\u00a0 <strong>They do not get picked up in sweeps very easily, so if you average even just one larva per 25 sweeps, you may well be justified in taking action (depending on your history with this pest, your expected crop value, etc.).<\/strong> View the <a href=\"https:\/\/extension.umaine.edu\/cranberries\/site-map\/cranberry-ipm-guide\/\">Maine Cranberry Pest Management Guide <\/a>for the most current recommended Action Threshold (AT) to consider using (traditional AT is 1), and for a list of control materials.\u00a0 Infestations of 2nd-generation larvae are far more dangerous, because their numbers are much higher, especially, of course, if any 1st-generation populations are left uncontrolled.\u00a0 Infestations of both generations are usually\u00a0<strong>patchy<\/strong>,\u00a0at least at first, and larvae tend to be more numerous along edges. Spot-treatment is desirable in such cases. <strong>Sweepnet-captured \u2018First Dates\u2019 for 1st-generation larvae<\/strong><strong>: <\/strong>6\/12\/06, 5\/25\/07, 5\/14\/08, 5\/14\/09, 5\/16\/13, 5\/20\/14, 5\/27\/17, 5\/21\/18<strong> <em>(Average of these = May 22nd); <\/em><\/strong><strong><em>See also <\/em><\/strong>the <a href=\"https:\/\/extension.umaine.edu\/cranberries\/grower-services\/pest-reports\/\"><strong>Pest Report<\/strong><\/a> each year for news of Maine\u2019s first detection of 1st-generation fireworm larvae.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\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","protected":false},"excerpt":{"rendered":"<p>After\u00a0terminal bud has\u00a0broken dormancy &amp;\u00a0begun to swell or\u00a0grow: The approximate window for spraying for Upright Dieback control is April 30 &#8211; May 20. For Washington County growers, the target window is likely a bit later (May 6 &#8211; 26). But, exact timing depends on whether the variety is early or late-season. Remember, too, that if [&hellip;]<\/p>\n","protected":false},"author":60,"featured_media":0,"parent":574,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"templates\/page-withsidebar.php","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-582","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>May (Maine Cranberry Management Calendar) - 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\/cranberry-management-calendar\/may\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"May (Maine Cranberry Management Calendar) - Cooperative Extension: Cranberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"After\u00a0terminal bud has\u00a0broken dormancy &amp;\u00a0begun to swell or\u00a0grow: The approximate window for spraying for Upright Dieback control is April 30 &#8211; May 20. 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