{"id":410,"date":"2015-07-03T14:09:48","date_gmt":"2015-07-03T14:09:48","guid":{"rendered":"http:\/\/agrilife.org\/texasrowcrops\/?p=410"},"modified":"2015-07-31T14:41:15","modified_gmt":"2015-07-31T14:41:15","slug":"plant-growth-regulators-as-a-tool-for-2015s-challenges","status":"publish","type":"post","link":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/","title":{"rendered":"Plant Growth Regulators as a Tool for 2015&#8217;s Challenges"},"content":{"rendered":"<p><strong>by Gaylon Morgan and Mark Kelley<\/strong><\/p>\n<p>Much of Texas\u2019 cotton was planted at or very near the final planting date for within each region of the state. These delayed plantings have equated to one of the latest Texas cotton crops we have seen in many years. Additionally, much of South and East Texas has been further delayed by excessive rain delaying fruit set. This article will address some of the considerations for plant size management and promoting early maturity in the 2015 growing season. The University of Georgia publication titled<a href=\"http:\/\/www.caes.uga.edu\/extension\/irwin\/anr\/documents\/Vol16-3.pdf\"> \u201cUse of PGRs as a Management Tool in Cotton\u201d<\/a> has a good publication discussing the importance of PGR, physiological role, and recommendations. Additionally, Cotton Incorporated\u2019s publication titled <a href=\"http:\/\/cotton.tamu.edu\/General Production\/Cotton-Plant-Growth-Regulation.pdf\">\u201cUtility of Plant Growth Regulation in Cotton Production\u201d<\/a> provides a Beltwide summary of the PGRs\u2019 impact on maturity, height, and height.<\/p>\n<p><strong>South and East, Texas Considerations:<\/strong><\/p>\n<p>In South and East Texas, the benefits of PGRs (plant growth regulators) is on plant size management, because sufficient time (heat units) exist to finish out the cotton. However, any benefit on increasing maturity will be welcomed to decrease the risk adverse weather (or hurricanes) in the fall. Thus far, excessive rainfall and cloudy weather has substantially reduced fruit retention, further delaying the crop, and causing shading effects. See Figure 1 below. With poor fruit load, PGR (plant growth regulators) management will be necessary later into the season than most years. PGRs applications timings should be based on growth stage (reproductive), fruit load, plant size, and expectation for continued vigorous growth. With the loss of the first multiple fruiting positions in some fields, PGRs will be applied on much bigger plants this year. The balance this year will be the trying to compress plant growth (decrease internode length) of large plants without retarding plant growth (and yield) too much. Especially this year, PGR application should be made on a field-by-field basis due to the extreme variability between fields.<\/p>\n<p>With cotton beyond the early bloom stage and internode length (average of top 5 nodes) beyond 2.25 inches, a PGR application is warranted. However, for cotton plants that are currently or recently recovering from the stress of saturated conditions, high rates of PGR should be avoided. The combination of stress + high PGR rates could prematurely send the crop into the cut-out stage and would likely reduce yields. The best approach is to apply multiple applications of a moderate PGR rate, such as 8 oz\/a of mepiquate chloride, and assess the situation.<\/p>\n<div id=\"attachment_413\" style=\"width: 179px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-413\" class=\"wp-image-413 size-medium\" src=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1-169x300.jpg\" alt=\"\" width=\"169\" height=\"300\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1-169x300.jpg 169w, https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg 378w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/a><p id=\"caption-attachment-413\" class=\"wp-caption-text\">Figure 1. A 10+ nodes cotton plant from Upper Gulf Coast with a very low boll load. Picture compliments of Dr. Zach Eder.<\/p><\/div>\n<p><strong>Rolling and High Plains Considerations:<\/strong><\/p>\n<p>In the Rolling Plains and High Plains, PGR applications should be considered for two reasons this season. First, PGRs can be beneficial in promoting earliness by promoting early fruit set. Second, PGRs can be helpful in managing plant size for stripper harvested cotton, if excessive moisture continues or under full irrigation in the West Texas. See Figure 2 below. The goal of PGR applications is to slow cotton growth until the boll load naturally slows the vegetative growth. However, PGRs should not be applied to plants that are already under stress from moisture, spider mites, herbicide, or nutrient. Also, applications should not be made prior to 50% matchhead square. Assuming no stress, decision to apply PGRs should be dependent on several factors, including the current growth (internode length), fruit retention, current and predicted weather (precipitation and heat), variety, and soil nitrogen levels.<\/p>\n<p>Fields with low fruit set, excellent moisture, high soil nitrogen, and vigorous growing varieties are the prime candidates for PGRs and should be watched carefully for excessive vegetative growth. In addition to size management, sequential applications of low to moderate rates of PGRs have shown to reduce about 1 main stem node, which results in 3 to 5 day earlier cutout. This promotion of earliness could be a big advantage in 2015. Also, a 5 to 20% reduction in plant height can be typically be obtained from PGR applications (Boman and Kelley, 2007).<\/p>\n<p>As mentioned in a publication titled (<a href=\"http:\/\/cotton.tamu.edu\/Geneeral Production\/2007 High Plains Plant Growth Regulators.pdf\">Plant Growth Regulators)<\/a> by Randy Boman in 2007, PGRs decisions in West Texas are challenging. High temperatures, high winds, and low humidity will slow plant growth, especially in low irrigation capacity fields. So, using the weather forecast should also contribute to the decision on PGR applications and rates.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-414 size-medium\" src=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture1-223x300.jpg\" alt=\"Picture1\" width=\"223\" height=\"300\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture1-223x300.jpg 223w, https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture1.jpg 492w\" sizes=\"auto, (max-width: 223px) 100vw, 223px\" \/><\/a><a href=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-415 size-medium\" src=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture2-224x300.jpg\" alt=\"Picture2\" width=\"224\" height=\"300\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture2-224x300.jpg 224w, https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Picture2.jpg 496w\" sizes=\"auto, (max-width: 224px) 100vw, 224px\" \/><\/a>Cotton plant not treated (left) with PGR and cotton treated (right) with PGR at pinhead square. Notice the reduction in internode length of the mainstem.<\/p>\n<p>Other useful information can be found at the links below.<br \/>\n1. <a href=\"http:\/\/cotton.ces.ncsu.edu\/2015\/06\/pgr-management-considerations-collins-edmisten\/\">PGR Management Considerations <\/a>(in North Carolina) by Collins and Edmisten<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_90\" style=\"width: 110px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/morgansm-e1432825283822.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-90\" class=\"wp-image-90 size-full\" src=\"http:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/morgansm-e1432825283822.jpg\" alt=\"Dr. Gaylon Morgan\" width=\"100\" height=\"132\" \/><\/a><p id=\"caption-attachment-90\" class=\"wp-caption-text\">Dr. Gaylon Morgan<br \/> State Extension Cotton Specialist<br \/> College Station, TX<br \/> 979-845-2425<br \/> <a href=\"mailto:gmorgan@tamu.edu\">gmorgan@tamu.edu<\/a><\/p><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>by Gaylon Morgan and Mark Kelley Much of Texas\u2019 cotton was planted at or very near the final planting date for within each region of the state. These delayed plantings have equated to one of the latest Texas cotton crops we have seen in many years. Additionally, much of South and East Texas has been further delayed by excessive rain delaying fruit set. This article will address some of the considerations for plant size management and promoting early maturity in the 2015 growing season. The University of Georgia&#8230; <span class=\"read-more\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/\">Read More &rarr;<\/a><\/span><\/p>\n","protected":false},"author":1150,"featured_media":413,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[29,16],"tags":[],"class_list":["post-410","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-29","category-archive"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Plant Growth Regulators as a Tool for 2015&#039;s Challenges - Texas Row Crops Newsletter<\/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:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plant Growth Regulators as a Tool for 2015&#039;s Challenges - Texas Row Crops Newsletter\" \/>\n<meta property=\"og:description\" content=\"by Gaylon Morgan and Mark Kelley Much of Texas\u2019 cotton was planted at or very near the final planting date for within each region of the state. These delayed plantings have equated to one of the latest Texas cotton crops we have seen in many years. Additionally, much of South and East Texas has been further delayed by excessive rain delaying fruit set. This article will address some of the considerations for plant size management and promoting early maturity in the 2015 growing season. The University of Georgia... 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Read More &rarr;","og_url":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/","og_site_name":"Texas Row Crops Newsletter","article_published_time":"2015-07-03T14:09:48+00:00","article_modified_time":"2015-07-31T14:41:15+00:00","og_image":[{"width":378,"height":672,"url":"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg","type":"image\/jpeg"}],"author":"linda.francis","twitter_card":"summary_large_image","twitter_misc":{"Written by":"linda.francis","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/#article","isPartOf":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/"},"author":{"name":"linda.francis","@id":"https:\/\/agrilife.org\/texasrowcrops\/#\/schema\/person\/ada7ea262aed09397c43de3b66f61523"},"headline":"Plant Growth Regulators as a Tool for 2015&#8217;s Challenges","datePublished":"2015-07-03T14:09:48+00:00","dateModified":"2015-07-31T14:41:15+00:00","mainEntityOfPage":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/"},"wordCount":800,"image":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/#primaryimage"},"thumbnailUrl":"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg","articleSection":["2015","Archive"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/","url":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/","name":"Plant Growth Regulators as a Tool for 2015's Challenges - Texas Row Crops Newsletter","isPartOf":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/#website"},"primaryImageOfPage":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/#primaryimage"},"image":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/#primaryimage"},"thumbnailUrl":"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg","datePublished":"2015-07-03T14:09:48+00:00","dateModified":"2015-07-31T14:41:15+00:00","author":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/#\/schema\/person\/ada7ea262aed09397c43de3b66f61523"},"breadcrumb":{"@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/agrilife.org\/texasrowcrops\/2015\/07\/03\/plant-growth-regulators-as-a-tool-for-2015s-challenges\/#primaryimage","url":"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg","contentUrl":"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/07\/Cotton-Pic-1.jpg","width":378,"height":672,"caption":"Figure 1. A 10+ nodes cotton plant from Upper Gulf Coast with a very low boll load. 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