Management of insect and mite pests in small grains

The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311

Caterpillars in Canola

The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311.Entomology and Plant Patholog

Common small grain caterpillars in Oklahoma

The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311

Aphids in winter canola and their management

The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311

Management of insect and mite pests in small grains

The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311

Management of insect and mite pests in small grains

The Oklahoma Cooperative Extension Service periodically issues revisions to its publications. The most current edition is made available. For access to an earlier edition, if available for this title, please contact the Oklahoma State University Library Archives by email at [email protected] or by phone at 405-744-6311

Quantitative Study of Aphid Natural Enemies in Central Oklahoma Canola Fields

Winter canola (Brassica napus L.) is planted in late September through October in central Oklahoma and harvested in June. Three aphid species typically infest canola fields in central Oklahoma: cabbage aphid, Brevicoryne brassicae L.; green peach aphid, Myzus persicae (Sulzer); and turnip aphid, Lipaphis pseudobrassicae (Davis). Predatory insects and spiders and hymenopteran parasitoids that prey on aphids are present in canola fields in central Oklahoma. We used a D-vac suction device to sample aphids and natural enemies in a total of 23 canola fields in central Oklahoma in early November and mid-March of three growing seasons. During the three growing seasons, 2.4 to 50.9 aphids were collected per 120 placements of the D-vac sampler per canola field. Diaeretiella rapae (McIntosh) was the most abundant parasitoid, with 0.04 to 5.1 individuals per 120 placements, while Araneae (spiders) were the most abundant predators ranging from 0.35 to 4.9 per 120 placements. Other predators were Chrysopidae, Hemerobiidae, Nabidae, and Syrphidae, with relative density of most taxa increasing from November to March. Correlations of relative density of D. rapae and larval Coccinellidae to aphid relative density were positive and significant suggesting the taxa had a reproductive and/or aggregative numerical response to aphids in canola. D. rapae, Coccinellidae, and perhaps spiders killed the most aphids in central Oklahoma canola fields

Quantitative Assessment of Aphid Parasitoids and Predators in Central Oklahoma Wheat Fields during Five Growing Seasons

Winter wheat (Triticum aestivum L.) is the most widely grown crop in Oklahoma and typically is planted in autumn and harvested in June. Wheat in Oklahoma is often infested by insect pests, the most important of which are the cereal aphids – greenbug, Schizaphis graminum (Rondani), and bird cherry-oat aphid, Rhopalosiphum padi (L.). We sampled a total of 69 wheat fields in central Oklahoma during five wheat-growing seasons. The number of wheat fields sampled ranged from seven in the 2016-2017 growing season to 24 fields in the 2009-2010 growing season. We used a D-vac suction sampler to collect aphids and their natural enemies in wheat fields in early November and again in the middle of March. During the five wheat-growing seasons, adult Lysiphlebus testaceipes (Cresson) and Aphelinus nigritus (Howard) were the most consistent and abundant parasitoids, with L. testaceipes present in each of the five growing seasons. The mean number of adult L. testaceipes per D-vac sample ranged from 1.38 in 2018-2019 to 64.3 adults per sample in the 2008-2009 growing season. Aphelinus nigritus was present in four of the five growing seasons and ranged from 0.86 to 7.82 adults per sample among the four growing seasons. Among arthropod predators, larval coccinellids were found in each growing season and ranged from 2.23 to 15.38 individuals per sample. Spiders were present in the five growing seasons and ranged from 1.63 to 19.0 per sample. Several other predator taxa in samples included Chrysopidae, Hemerobiidae, Nabidae, and Syrphidae. Abundance of most species increased from November to March. Abundance of most natural enemy species (or taxa) was positively correlated to aphid abundance, suggesting natural enemies had an aggregative and/or reproductive numerical response to aphid populations

Collaborating with Wheat Producers in Demonstrating Areawide Integrated Pest Management

Focus groups were used to initiate collaborative relationships with wheat producers while learning about their farming history and decision-making. Focus group transcripts illustrate that producers were less confident in evaluating insect management problems compared to weed management. Producers do rely on Cooperative Extension in managing insect problems. Extension educators continue to play an important role in increasing producer\u27s knowledge of simplified field scouting and insect identification technology