{"id":789,"date":"2017-05-05T15:23:37","date_gmt":"2017-05-05T20:23:37","guid":{"rendered":"http:\/\/agrilife.org\/mid-coast-ipm\/?p=789"},"modified":"2017-05-12T16:39:49","modified_gmt":"2017-05-12T21:39:49","slug":"sorghum-of-the-mid-coast-may-5-2017","status":"publish","type":"post","link":"https:\/\/agrilife.org\/mid-coast-ipm\/sorghum-of-the-mid-coast-may-5-2017\/","title":{"rendered":"Sorghum of the Mid-Coast – May 5, 2017"},"content":{"rendered":"
\"\"<\/a>

Sugarcane aphids on a sorghum leaf (May 2, 2017)<\/p><\/div>\n

Sorghum fields in Calhoun, Refugio and Victoria Counties should be scouted weekly for pest insects.\u00a0This is especially true for the Sugarcane Aphid and Sorghum Midge.\u00a0 We have ben finding sugarcane aphids in sorghum fields across the area but their numbers have been\u00a0below threshold levels thus far.<\/p>\n

I have seen only occasional plants along the southern edge of\u00a0sorghum fields\u00a0with sugarcane aphids.\u00a0 The most I have seen thus far is small colonies of less than 20 aphids on a\u00a0less than 1% of plants.<\/p>\n

When scouting sorghum fields, I suggest marking plants containing sugarcane aphids and returning to these plants twice a week.\u00a0 Continue to check adjacent plants and other parts of the field for additional aphid\u00a0colonies.<\/p>\n

Sorghum fields that have begun to bloom should be checked for Sorghum Midge.<\/p>\n

\"\"<\/a>

Sorghum Midge (Picture by Danielle Sekula)<\/p><\/div>\n

During the single day of adult life, each female lays about 50 yellowish white eggs in \ufb02owering spikelets of sorghum. Eggs hatch in 2 to 3 days. Larvae are colorless at \ufb01rst, but when fully grown, are dark orange. Larvae complete development in 9 to 11 days and pupate between the spikelet glumes. Shortly before adult emergence, the pupa works its way toward the upper tip of the spikelet.\u00a0 After the adult emerges, the clear or white pupal skin remains at the tip of the spikelet.\u00a0 Source<\/a><\/p>\n

A sorghum midge damages sorghum when the larva feeds on a newly fertilized ovary, preventing normal kernel development. Grain loss can be extremely high.<\/p>\n

Economic thresholds\u00a0for sorghum midge can range from 0.5 to\u00a01.5 per blooming sorghum\u00a0head.\u00a0 This threshold varies with the cost of control, grain\u00a0value, and number of blooming heads\u00a0per acre.\u00a0The economic threshold calculator can be found here<\/a>.<\/p>\n

When an economic population is found treatment is necessary to prevent economic loss.\u00a0After treatment monitor the field closely for sugarcane aphids as their number can increase following insecticide applications that impact beneficial insects.<\/p>\n","protected":false},"excerpt":{"rendered":"

Sorghum fields in Calhoun, Refugio and Victoria Counties should be scouted weekly for pest insects.\u00a0This is especially true for the Sugarcane Aphid and Sorghum Midge.\u00a0 We have ben finding sugarcane aphids in sorghum fields across the area but their numbers have been\u00a0below threshold levels thus far. I have seen only occasional plants along the southern edge of\u00a0sorghum fields\u00a0with sugarcane aphids.\u00a0 The most I have seen thus far is small colonies of less than 20 aphids on a\u00a0less than 1% of plants. When scouting sorghum fields, I suggest marking… Read More →<\/a><\/span><\/p>\n","protected":false},"author":1158,"featured_media":791,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[11],"tags":[25,6,22,7],"class_list":["post-789","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pest-management-news","tag-economic-threshold","tag-sorghum","tag-sorghum-midge","tag-sugarcane-aphid"],"acf":[],"yoast_head":"\nSorghum of the Mid-Coast - May 5, 2017 - Mid-Coast IPM<\/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\/mid-coast-ipm\/sorghum-of-the-mid-coast-may-5-2017\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sorghum of the Mid-Coast - May 5, 2017 - Mid-Coast IPM\" \/>\n<meta property=\"og:description\" content=\"Sorghum fields in Calhoun, Refugio and Victoria Counties should be scouted weekly for pest insects.\u00a0This is especially true for the Sugarcane Aphid and Sorghum Midge.\u00a0 We have ben finding sugarcane aphids in sorghum fields across the area but their numbers have been\u00a0below threshold levels thus far. I have seen only occasional plants along the southern edge of\u00a0sorghum fields\u00a0with sugarcane aphids.\u00a0 The most I have seen thus far is small colonies of less than 20 aphids on a\u00a0less than 1% of plants. When scouting sorghum fields, I suggest marking... 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