{"id":747,"date":"2017-04-05T15:21:17","date_gmt":"2017-04-05T20:21:17","guid":{"rendered":"http:\/\/agrilife.org\/mid-coast-ipm\/?p=747"},"modified":"2017-04-28T13:32:48","modified_gmt":"2017-04-28T18:32:48","slug":"cotton-aphids-in-seedling-cotton","status":"publish","type":"post","link":"https:\/\/agrilife.org\/mid-coast-ipm\/cotton-aphids-in-seedling-cotton\/","title":{"rendered":"Cotton Aphids in Seedling Cotton"},"content":{"rendered":"
\"\"<\/a>

Winged Cotton Aphids<\/p><\/div>\n

Cotton\u00a0field maturity ranges from\u00a0emergence to plants with 3-4\u00a0true leaves.\u00a0Most fields are cotyledon to 1-true leaf.\u00a0The normal insect pests we see in seedling cotton\u00a0include thrips, cutworms, mites\u00a0and aphids.<\/p>\n

When scouting seedling cotton plants, I usually pull a plant from the ground and look at the leaves for insects.\u00a0 This week I have found Cotton Aphids<\/strong> in many fields.\u00a0 Most of the aphids are winged, indicating they have recently arrived.\u00a0But some plants have both winged and small wingless aphids.<\/p>\n

First, aphids are rarely yield limiting to seedling cotton plants.\u00a0 Most cotton fields are planted with seed treated with insecticides which will control cotton aphids after they feed on the plants for a few days. These aphids are an important food source for natural enemies such as lady beetles and parasitoids.\u00a0Thus, insecticide treatments for aphids in pre-blooming cotton should be avoided if possible.<\/p>\n

Second, the number of aphids necessary to justify an insecticide on seedling cotton is more than 50 aphids per leaf.\u00a0 This population is rarely found.<\/p>\n

\"\"<\/a>

Parasitized Cotton Aphids (Aphid Mummies)<\/p><\/div>\n

In fields with cotton aphids, I suggest giving the environment and beneficial insects and fungi the opportunity to control the aphids without the need for an insecticide application.\u00a0 Natural control of cotton aphids is common on the Texas\u00a0coast and costs nothing.<\/p>\n

One of the beneficial insects I found today\u00a0is the aphid parasitoid Lysephilbus testaceipes<\/em>.\u00a0These were found on older volunteer plants with 4-5 true leaves.<\/p>\n

Parasitized aphids are called aphid mummies.\u00a0 They are larger, tan colored aphids with a developing parasitic wasp\u00a0inside.\u00a0These aphids are no longer feeding on the plant. If 10-20% of the aphids are mummified, most of the others are probably also parasitized as well.<\/p>\n

Lady beetle adults and nymphs, green lacewings nymphs and syrphid fly larvae can also prey on aphids.<\/p>\n

\"\"

Aphids killed by the fungus, Neozygites fresenii, appear as masses of gray colored fuzz. (https:\/\/cottonbugs.tamu.edu\/foliage-feeding-pests\/aphids\/)<\/p><\/div>\n

Rain and heavy dew will encourage the development of aphid feeding\u00a0fungi.\u00a0look for aphids\u00a0having\u00a0a fuzzy appearance, the fungus Neozygites<\/i> is the likely culprit.\u00a0 This fungus can decimate an aphid population.<\/p>\n

If you find a field that exceeds this threshold (50 aphids per leaf), wait\u00a02-3 days and return to see if the aphids are still above this level or if their numbers are declining.<\/p>\n

More information on aphids in cotton can be found HERE<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Cotton\u00a0field maturity ranges from\u00a0emergence to plants with 3-4\u00a0true leaves.\u00a0Most fields are cotyledon to 1-true leaf.\u00a0The normal insect pests we see in seedling cotton\u00a0include thrips, cutworms, mites\u00a0and aphids. When scouting seedling cotton plants, I usually pull a plant from the ground and look at the leaves for insects.\u00a0 This week I have found Cotton Aphids in many fields.\u00a0 Most of the aphids are winged, indicating they have recently arrived.\u00a0But some plants have both winged and small wingless aphids. First, aphids are rarely yield limiting to seedling cotton plants.\u00a0 Most… Read More →<\/a><\/span><\/p>\n","protected":false},"author":1158,"featured_media":759,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[11],"tags":[57,15,21],"class_list":["post-747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pest-management-news","tag-beneficial-insects","tag-cotton","tag-cotton-aphids"],"acf":[],"yoast_head":"\nCotton Aphids in Seedling Cotton - 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\/cotton-aphids-in-seedling-cotton\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cotton Aphids in Seedling Cotton - Mid-Coast IPM\" \/>\n<meta property=\"og:description\" content=\"Cotton\u00a0field maturity ranges from\u00a0emergence to plants with 3-4\u00a0true leaves.\u00a0Most fields are cotyledon to 1-true leaf.\u00a0The normal insect pests we see in seedling cotton\u00a0include thrips, cutworms, mites\u00a0and aphids. When scouting seedling cotton plants, I usually pull a plant from the ground and look at the leaves for insects.\u00a0 This week I have found Cotton Aphids in many fields.\u00a0 Most of the aphids are winged, indicating they have recently arrived.\u00a0But some plants have both winged and small wingless aphids. First, aphids are rarely yield limiting to seedling cotton plants.\u00a0 Most... 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