{"id":174,"date":"2015-06-19T19:41:43","date_gmt":"2015-06-19T19:41:43","guid":{"rendered":"http:\/\/agrilife.org\/mid-coast-ipm\/?p=174"},"modified":"2015-07-09T15:37:15","modified_gmt":"2015-07-09T15:37:15","slug":"scouting-sorghum-with-mixed-maturity","status":"publish","type":"post","link":"https:\/\/agrilife.org\/mid-coast-ipm\/scouting-sorghum-with-mixed-maturity\/","title":{"rendered":"Scouting Sorghum with Mixed Maturity"},"content":{"rendered":"

In the grain sorghum fields of the Mid-Coast, we continue to find sorghum midge, stink bugs, headworms and both sugarcane and yellow sugarcane aphids.\u00a0 10-20% of the fields have one or more insects at or above economic levels.<\/p>\n

\"Sorghum<\/a>

Sorghum Midge<\/p><\/div>\n

Many grain sorghum fields in the Mid-Coast have plants with maturity that can range from boot to soft dough.\u00a0 In some fields these different maturities are in different parts of the fields while other fields have these plants all with in 20 feet of each other.\u00a0 Many of these fields also have midge, stink bugs and\/or headworms.\u00a0 Determining the economic threshold in these fields is a considerable challenge because not all of the plants are susceptible to midge, stink bugs or headworms.\u00a0 Blooming heads are susceptible to midge and heads at or beyond bloom are susceptible to stink bugs and headworms.<\/p>\n

To help with determining the proper economic threshold, we must determine the number of susceptible heads per acre for each pest.\u00a0 When visiting these fields, measure 10 feet of row and count the number of heads in bloom (for midge), and the number of heads in bloom or beyond (for stink bugs and headworms).\u00a0 This count should be done in as 5-10 places in the field depending on field size and can be done while looking for the pest insects.\u00a0 Larger fields require more locations.<\/p>\n

Divide this number of heads by 10 and multiply by the number of row feet per acre for your row width (Table 1).\u00a0 You can then use the number of susceptible heads per acre to calculate the economic threshold for the insect pest in question HERE<\/a>.\"Row<\/a><\/p>\n

Once you have determined the economic threshold, you can determine if the field requires treatment for one of these pests.\u00a0 Assuming the cost of insecticide for a pyrethroid application is $3, add the cost of application.\u00a0 I use $3 for a ground application and $6 for aerial application and a grain value of $7.<\/p>\n

If a field has 30,000 susceptible heads in bloom, the treatment threshold for midge is 0.95 per head for ground application and 1.43 by air.\u00a0 Stink bugs ET is 0.88 by ground and 1.31 by air.\u00a0 And headworm ET is 1.47 Medium worms and 0.28 Large worms by ground or 2.2 medium and 0.42 large worms by air.<\/p>\n

However, for a more uniform field with 60,000 susceptible heads in bloom, the treatment threshold for midge is 0.48 per head for ground application and 0.71 by air.\u00a0 Stink bugs ET is 0.44 by ground and 0.66 by air.\u00a0 And headworm ET is 0.73 Medium worms and 0.14 Large worms by ground or 1.1 medium and 0.21 large worms by air.<\/p>\n

The next question is what if we have multiple pests below threshold?\u00a0 In this case, consider the percentage of ET for each pest and add the percentages together.\u00a0 If they exceed 100% ET then treat the field.<\/p>\n

For example, if we have 0.5 midge per head and 0.5 stink bugs per head, the percentage ET for a ground application in the above example would be (30,000 heads per acre):<\/p>\n

(0.5 midge \/ 0.95) + (0.5 stink bugs \/ 0.88) = 1.09<\/p>\n

In this example, I would treat the field because the ET of the two pests is greater than 1.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

In the grain sorghum fields of the Mid-Coast, we continue to find sorghum midge, stink bugs, headworms and both sugarcane and yellow sugarcane aphids.\u00a0 10-20% of the fields have one or more insects at or above economic levels. Many grain sorghum fields in the Mid-Coast have plants with maturity that can range from boot to soft dough.\u00a0 In some fields these different maturities are in different parts of the fields while other fields have these plants all with in 20 feet of each other.\u00a0 Many of these fields… Read More →<\/a><\/span><\/p>\n","protected":false},"author":1158,"featured_media":181,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[11],"tags":[19,24,23,6,22,7],"class_list":["post-174","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pest-management-news","tag-field-scouting","tag-headworm","tag-rice-stink-bug","tag-sorghum","tag-sorghum-midge","tag-sugarcane-aphid"],"acf":[],"yoast_head":"\nScouting Sorghum with Mixed Maturity - 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\/scouting-sorghum-with-mixed-maturity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Scouting Sorghum with Mixed Maturity - Mid-Coast IPM\" \/>\n<meta property=\"og:description\" content=\"In the grain sorghum fields of the Mid-Coast, we continue to find sorghum midge, stink bugs, headworms and both sugarcane and yellow sugarcane aphids.\u00a0 10-20% of the fields have one or more insects at or above economic levels. 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