{"id":1289,"date":"2018-03-09T21:58:41","date_gmt":"2018-03-09T21:58:41","guid":{"rendered":"https:\/\/agrilife.org\/texasrowcrops\/?p=1289"},"modified":"2018-05-30T18:57:57","modified_gmt":"2018-05-30T18:57:57","slug":"grain-sorghum-hybrid-tolerance-to-sugarcane-aphid","status":"publish","type":"post","link":"https:\/\/agrilife.org\/texasrowcrops\/2018\/03\/09\/grain-sorghum-hybrid-tolerance-to-sugarcane-aphid\/","title":{"rendered":"Grain Sorghum Hybrid Tolerance to Sugarcane Aphid"},"content":{"rendered":"<p>by Dr. Calvin Trostle, Extension Agronomy, TAMU Dept. of Soil &amp; Crop Sciences, Lubbock, 806-746-6101, <a href=\"mailto:ctrostle@ag.tamu.edu\">ctrostle@ag.tamu.edu<\/a>; Dr. Allen Knutson, Extension Entomology, Dallas, (972) 952-9222, <a href=\"mailto:allen.knutson@ag.tamu.edu\">allen.knutson@ag.tamu.edu<\/a>; Dr. Ron Schnell, Extension Agronomy\/TAMU Dept. of Soil &amp; Crop Sciences, College Station, (979) 845-2935, <a href=\"mailto:ronschnell@tamu.edu\">ronschnell@tamu.edu<\/a><\/p>\n<p>This is an edited version of a report first prepared for Texas Grain Sorghum Association\u2019s \u201cSorghum Insider\u201d (see other TGSA sorghum tips at <a href=\"http:\/\/texassorghum.org\/sorghum-tips\">http:\/\/texassorghum.org\/sorghum-tips<\/a>)\u00a0 Here we share results of different assessments of grain sorghum hybrids to SCA across the state.\u00a0 We have observed dramatic results of hybrid tolerance in many trials (Fig. 1).<\/p>\n<div id=\"attachment_1290\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Fig.-1-TGSA-2018-03Mar09.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1290\" class=\"wp-image-1290 size-large\" src=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Fig.-1-TGSA-2018-03Mar09-1024x768.jpg\" alt=\"\" width=\"640\" height=\"480\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Fig.-1-TGSA-2018-03Mar09-1024x768.jpg 1024w, https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Fig.-1-TGSA-2018-03Mar09-300x225.jpg 300w, https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Fig.-1-TGSA-2018-03Mar09-768x576.jpg 768w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><p id=\"caption-attachment-1290\" class=\"wp-caption-text\">Fig, 1. Sugarcane aphid tolerant grain sorghum hybrid trial with no spraying. Right is Dyna-Gro M74GB17, left is susceptible Pioneer 86G32. All plot data including yields are compared to plots maintained near aphid free (three sprays) conditions. Oct. 21, 2017, Lubbock, TX.<\/p><\/div>\n<p><u>What will happen with sugarcane aphid in Texas in 2018?<\/u>\u2014No one can say for certain.\u00a0 We don\u2019t know.\u00a0 But we do understand SCA well and that will help us all adjust to what SCA does in 2018, and we are in a far better position than we were in 2015.<\/p>\n<p><em>Pre-plant Considerations for Potentially Reducing the Impact of SCA<\/em><\/p>\n<p>Though most producers will think of insect control measures to involve scouting protocols, thresholds, insecticide choice and timing, method of application, spray carrier volume, and re-scouting, here are early considerations.\u00a0 We thank Texas A&amp;M AgriLife Extension entomologists for the suggestions:<\/p>\n<ul>\n<li>If planting grain sorghum it is our opinion that you should agree you will spray if science and Extension recommendations call for it. Some producers in the Texas South Plains in 2017 had good dryland sorghum, yield potential above average, but were adamant they would NOT spray.\u00a0 That strategy, if you want to call it that, cost some producers tens of thousands of dollars in lost yield.\u00a0 <u>If you indeed plant grain sorghum but be unwilling to spray<\/u>, then the following three points are especially important.<\/li>\n<li><u>Plant early<\/u>. This may be most applicable in the High Plains where the cropping season could be underway for two months or more before potential arrival of SCA. \u00a0Don\u2019t plant so early to risk sickly seedlings from cool weather and late freezes, but a couple of weeks earlier planting vs. your norm enables your sorghum to be at more advanced growth stages before potential infestation may occur.\u00a0 For South Plains growers, this could mean planting about the last 7-10 days of April, or near May 1 if in the Panhandle.\u00a0 If the same pattern occurred in 2018 as last year around Lubbock, late April sorghum (medium and especially medium-early hybrids) was heading when SCA arrived.\u00a0 Larger plants can tolerate the SCA better compared to a few aphids on a three- or four-leaf stage seedling.<\/li>\n<li><u>Seed insecticide<\/u>. AgriLife entomologists generally recommend that seed insecticide treatments help control SCA at least 30 days and may offer a reduced level of protection (suppression) for another couple of weeks. The cost of a comprehensive seed treatment with insecticide (also includes fungicide) may add $40-50\/bag, but at ~5 lbs. seed per acre (about 65,000-70,000 seeds per acre), that is $4-5\/acre.\u00a0 High Pains dryland seeding rates of ~30,000 seeds per acre would reduce added seed costs to $2\/acre or less.<\/li>\n<li>Plant a <u>sorghum hybrid with documented tolerance<\/u> from independent sources. But know this: 1) all sorghum hybrids should be assumed susceptible to sugarcane aphid at some level, and must be scouted, 2) the ability of an individual hybrid to perform well in the presence of SCA may be influenced (diminished) by environmental conditions.\u00a0 Likewise, is a high yielding hybrid that is susceptible something to avoid?\u00a0 That depends. If you have a hybrid that outperforms on your farm, is it worth the more likely potential cost of spraying if it becomes necessary? (See Fig. 2.)<\/li>\n<\/ul>\n<div id=\"attachment_1291\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Trostle-Chart.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1291\" class=\"size-large wp-image-1291\" src=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Trostle-Chart-1024x736.jpg\" alt=\"\" width=\"640\" height=\"460\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Trostle-Chart-1024x736.jpg 1024w, https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Trostle-Chart-300x216.jpg 300w, https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Trostle-Chart-768x552.jpg 768w, https:\/\/agrilife.org\/texasrowcrops\/files\/2018\/03\/Trostle-Chart.jpg 1257w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><p id=\"caption-attachment-1291\" class=\"wp-caption-text\">Fig. 2. Central Texas, South Texas, and Rolling Plains summary (at least five trial sites) of relative yield performance of numerous grain sorghum hybrids deemed to be tolerant or susceptible to sugarcane aphid. SCA pressure was not observed at all sites thus the data also represents basic yield potential. Schnell, 2017.<\/p><\/div>\n<p><em>Grain Sorghum Hybrids Demonstrating SCA Tolerance in Texas<\/em><\/p>\n<p>First, the data will be revisited to potentially update High Plains information so watch for more results (contact Trostle).\u00a0 The criteria for the information below is <u>multiple sites across more than one year<\/u> where SCA infestation occurred.\u00a0 Probably the best trials are where sets of replicated plots are maintained under both sprayed (e.g., near aphid free) and unsprayed conditions.\u00a0 This enables a comparison of the two yields.\u00a0 <em>Also, in our trials I (Trostle) have certainly noted that some hybrids that were deemed tolerant didn\u2019t look like it, suffering significant damage.\u00a0 So, know that this is not take-it-to-the-bank assured SCA tolerance let alone resistance<\/em>.\u00a0 There are also likely several hybrids that have comparable SCA tolerance but have not been tested enough to document tolerance.<\/p>\n<p><u>From Ron Schnell, Soil &amp; Crop Sciences, College Station:<\/u><\/p>\n<p>Numerous replicated plot and strip trials, many with weekly counts of sugarcane aphids on lower and upper leaves.<\/p>\n<p>Tolerant\u2014<\/p>\n<ul>\n<li>Dekalb 37-07<\/li>\n<li>Pioneer 83P56 (long maturity)<\/li>\n<li>B&amp;H Genetics BH4100, BH 3616,<\/li>\n<li>Golden Acres 3960B<\/li>\n<li>Warner Seed W-7501 (tall, similar to forage sorghum), W-844-E<\/li>\n<li>Sorghum Partners SP7715, SP73B12, SP78M30<\/li>\n<li>Alta AG1203<\/li>\n<li>Dyna-Gro M74GB17<\/li>\n<\/ul>\n<p><u>From Allen Knutson &amp; Extension Entomology Colleagues:<\/u><\/p>\n<p>Beginning in 2014, Texas A&amp;M AgriLife Extension and Research, with support from the Texas Grain Sorghum Producers Board, began evaluation of hybrids in replicated field trials to confirm resistance to sugarcane aphid.\u00a0 Trials were conducted in the Rio Grande Valley, Gulf Coast and north Texas and compared the number of sugarcane aphids and leaf damage among the hybrids and to hybrids known to be susceptible to sugarcane aphid.<\/p>\n<p>These trials confirmed resistance in 14 hybrids from seven different seed companies (Table 1).\u00a0 This list is not complete and these and other seed companies may have hybrids with resistance to sugarcane aphid.<\/p>\n<p>Sugarcane aphid populations increase more slowly on these resistant hybrids compared to susceptible hybrids where thresholds for insecticide use have been set at 50 aphids per leaf.\u00a0 Also, damage is lower on resistant hybrids compared to susceptible hybrids. In these trials, resistant hybrids had fewer sugarcane aphids than susceptible hybrids and aphid infestations often remained below the treatment threshold of 50 aphids per leaf for susceptible hybrids, and rarely exceeded 100 aphids per leaf.<\/p>\n<p><u>\u00a0<\/u><u>From Calvin Trostle, Soil &amp; Crop Sciences, Lubbock (preliminary)<\/u>;<\/p>\n<p>Results are limited, but initial evaluations (full evaluation by end of March) suggest:<\/p>\n<ul>\n<li><u>Stronger tolerance<\/u>: Dekalb 48-07 (we are told it will not be released on commercial scale), Dyna-Gro M74GB17, Pioneer 85Y34 (sharply distinct results but only confirmed to date at one other location where it was planted, Altus, OK), Warner W-7051 (tall medium long hybrid that looks more like a forage sorghum).<\/li>\n<li><u>Moderate tolerance<\/u>: Dekalb 37-07, Sorghum Partners SP7715.<\/li>\n<\/ul>\n<p>Table 1. Grain sorghum hybrids identified as having some resistance to sugarcane aphid in field trials Conducted by Texas A&amp;M AgriLife Research and Extension entomology, 2015-2017.\u00a0 See the Texas Sorghum Assn. \u201cSorghum Insider\u201d, Feb. 20, 2017, for AgriLife entomology\u2019s comments on suggested SCA thresholds above 50 aphids per leaf to as high as 200 aphids per leaf for strongly tolerant hybrids (for Central and South Texas, hybrids marked with \u2021 have suggested aphid thresholds of 150-200 per leaf).<\/p>\n<blockquote>\n<h4>Note. These hybrids are not immune to sugarcane aphid and must be scouted to monitor infestations.\u00a0 If sugarcane aphid infestations exceed the threshold guidance, an insecticide treatment should be made to avoid crop loss.<\/h4>\n<\/blockquote>\n<table class=\" aligncenter\">\n<tbody>\n<tr style=\"height: 74px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 74px;\" scope=\"colgroup\"><strong>Hybrid<\/strong><\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 74px;\" scope=\"colgroup\"><strong>Source<\/strong><\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 74px;\" scope=\"colgroup\"><strong>Resist.<\/strong><\/p>\n<p><strong>Level*<\/strong><\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 74px;\" scope=\"colgroup\"><strong>South Texas: <\/strong><\/p>\n<p><strong>County-Trail Year<\/strong><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 74px;\" scope=\"colgroup\"><strong>Gulf-Coast:<\/strong><\/p>\n<p><strong>County-Trial Year<\/strong><\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 74px;\" scope=\"colgroup\"><strong>North Texas:<\/strong><\/p>\n<p><strong>County-Trial Year<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 80px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">\u2021SP 7715<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Sorghum Partners<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Hidalgo 2016, 2017, Cameron 2017<\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Fort Bend 2016, 2017, Nueces 2016, 2017, Jim Wells 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Hunt 2016, 2017, Hill, 2017, Cooke 2016<\/td>\n<\/tr>\n<tr style=\"height: 96px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">SP 73B12<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Sorghum Partners<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Hidalgo 2017<\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Nueces 2016, Jim Wells 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Hunt 2017<\/p>\n<p>Cooke 2017<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">SP 78M30<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Sorghum Partners<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Nueces 2016, Jim Wells 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hunt 2017<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">OL2042<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Chromatin<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Cooke 2017<\/td>\n<\/tr>\n<tr style=\"height: 96px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">\u2021DKS 37-07<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">DeKalb<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Hidalgo 2014, 2015, 2016<\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Fort Bend 2016, Jim Wells 2017, Nueces 2016, 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Hunt 2016,<\/p>\n<p>Cooke 2016, 2017<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">DKS 47-07<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">DeKalb<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Jim Wells 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hill 2017<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">\u2021DKS 48-07<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">DeKalb<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hidalgo 2016<\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Fort Bend 2016, 2017, Nueces 2016<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hill 2017, Cooke 2016<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">AG 1203<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Alta<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Fort Bend 2016<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hunt 2016<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">\u20213960B<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Golden Acres<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hidalgo 2016, 2017, Cameron 2017<\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hunt 2017<\/td>\n<\/tr>\n<tr style=\"height: 96px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">\u20214100<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">BH Genetics<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Cameron 2016, 2017<\/p>\n<p>Hidalgo 2017,<\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Fort Bend 2016, 2017, Nueces 2016, 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 96px;\" scope=\"colgroup\">Hunt 2016, 2017, Cooke 2016, 2017<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">83P56<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Pioneer<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">MR<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Fort Bend 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Cooke 2017, Hunt 2017<\/td>\n<\/tr>\n<tr style=\"height: 80px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">\u2021W-7051<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Warner<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 80px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Fort Bend 2016, 2017, Nueces 2016, 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 80px;\" scope=\"colgroup\">Hunt 2016, 2017<\/td>\n<\/tr>\n<tr style=\"height: 56px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">\u2021W-625Y<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Warner<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 56px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 56px;\" scope=\"colgroup\">Hunt 2017, Cooke 2017<\/td>\n<\/tr>\n<tr style=\"height: 64.1665px;\">\n<td style=\"width: 94.1px; vertical-align: middle; height: 64.1665px;\" scope=\"colgroup\">W-844 E<\/td>\n<td style=\"width: 128.8px; vertical-align: middle; height: 64.1665px;\" scope=\"colgroup\">Warner<\/td>\n<td style=\"width: 68.8833px; vertical-align: middle; height: 64.1665px;\" scope=\"colgroup\">R<\/td>\n<td style=\"width: 204.65px; vertical-align: middle; height: 64.1665px;\" scope=\"colgroup\"><\/td>\n<td style=\"width: 237.467px; vertical-align: middle; height: 64.1665px;\" scope=\"colgroup\">Fort Bend 2016, 2017<\/td>\n<td style=\"width: 158.1px; vertical-align: middle; height: 64.1665px;\" scope=\"colgroup\">Hunt 2017<\/p>\n<p>&nbsp;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>*R=Resistant: Yield loss not detected, and aphids have not been observed consistently at or above 100 aphids\/leaf, threshold guidance is set at 100\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 aphids\/leaf although the actual threshold may be higher; MR=Moderately Resistant: Yield loss variable, treatment recommended at 100 aphids\/leaf, additional testing needed; For susceptible hybrids, treatment is recommended at 50 aphids\/leaf.<\/p>\n<p>Contributors: Mike Brewer, Robert Bowling, John Gordy, Allen Knutson, Danielle Sekula-Ortiz, Texas A&amp;M AgriLife Research and Extension.<\/p>\n<div id=\"attachment_137\" style=\"width: 235px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/Trostle-Pic-2014-e1435930962627.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-137\" class=\"wp-image-137 size-medium\" src=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/Trostle-Pic-2014-e1435930962627-225x300.jpg\" alt=\"\" width=\"225\" height=\"300\" srcset=\"https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/Trostle-Pic-2014-e1435930962627-225x300.jpg 225w, https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/Trostle-Pic-2014-e1435930962627-768x1024.jpg 768w, https:\/\/agrilife.org\/texasrowcrops\/files\/2015\/03\/Trostle-Pic-2014-e1435930962627.jpg 1224w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><p id=\"caption-attachment-137\" class=\"wp-caption-text\">Calvin Trostle<br \/> Professor and Extension Specialist<br \/> Lubbock, TX<br \/> 803.746.6101<br \/> <a href=\"mailto:ctrostle@ag.tamu.edu\">ctrostle@ag.tamu.edu<\/a><\/p><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>by Dr. Calvin Trostle, Extension Agronomy, TAMU Dept. of Soil &amp; Crop Sciences, Lubbock, 806-746-6101, ctrostle@ag.tamu.edu; Dr. Allen Knutson, Extension Entomology, Dallas, (972) 952-9222, allen.knutson@ag.tamu.edu; Dr. Ron Schnell, Extension Agronomy\/TAMU Dept. of Soil &amp; Crop Sciences, College Station, (979) 845-2935, ronschnell@tamu.edu This is an edited version of a report first prepared for Texas Grain Sorghum Association\u2019s \u201cSorghum Insider\u201d (see other TGSA sorghum tips at http:\/\/texassorghum.org\/sorghum-tips)\u00a0 Here we share results of different assessments of grain sorghum hybrids to SCA across the state.\u00a0 We have observed dramatic results of hybrid&#8230; <span class=\"read-more\"><a href=\"https:\/\/agrilife.org\/texasrowcrops\/2018\/03\/09\/grain-sorghum-hybrid-tolerance-to-sugarcane-aphid\/\">Read More &rarr;<\/a><\/span><\/p>\n","protected":false},"author":1371,"featured_media":1292,"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":[46,16,47],"tags":[],"class_list":["post-1289","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-46","category-archive","category-march-2018"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Grain Sorghum Hybrid Tolerance to Sugarcane Aphid - 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\/2018\/03\/09\/grain-sorghum-hybrid-tolerance-to-sugarcane-aphid\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Grain Sorghum Hybrid Tolerance to Sugarcane Aphid - Texas Row Crops Newsletter\" \/>\n<meta property=\"og:description\" content=\"by Dr. Calvin Trostle, Extension Agronomy, TAMU Dept. of Soil &amp; Crop Sciences, Lubbock, 806-746-6101, ctrostle@ag.tamu.edu; Dr. Allen Knutson, Extension Entomology, Dallas, (972) 952-9222, allen.knutson@ag.tamu.edu; Dr. Ron Schnell, Extension Agronomy\/TAMU Dept. of Soil &amp; Crop Sciences, College Station, (979) 845-2935, ronschnell@tamu.edu This is an edited version of a report first prepared for Texas Grain Sorghum Association\u2019s \u201cSorghum Insider\u201d (see other TGSA sorghum tips at http:\/\/texassorghum.org\/sorghum-tips)\u00a0 Here we share results of different assessments of grain sorghum hybrids to SCA across the state.\u00a0 We have observed dramatic results of hybrid... 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