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Mid-South Insect Pressure in Review

Melissa Siebert Insecticide Biology Team Leader Dow AgroSciences

Sponsored by Dow AgroSciences

Every year presents different growing conditions and new challenges, and 2014 was no exception. For some of the most troublesome pests, the university Extension experts predicted accurately that:

  • Tarnished plant bugs were capable of surviving the harsh winter.
  • Nonmigratory lepidopteron caterpillar pests were not impacted, because they overwinter as pupae deep in the soil; predators were impacted by the freezing temperatures.
  • Mild stink bug pressure was due to sensitivity of weaker green species to the extreme conditions.

What no one anticipated was an explosion of the sugarcane aphid.

Overall, sucking insect pest pressure in cotton could be categorized as moderate. Thrips pressure was at lower levels relative to previous years, due in part to frequent rains. Tarnished plant bugs were a concern season-long for cotton growers, even though overall infestations were also lower.

Many growers relied on Transform WG insecticide, which offers a new class of chemistry, applied at or near bloom for control of tarnished plant bugs. Aphids occurred later than normal in the cotton season, and infestations were persistent. Growers found applications of Transform targeting tarnished plant bugs were also an effective tool for the control of cotton aphids. Cool temperatures in late July did teach us that control of cotton aphids might not be as rapid as when plants are actively growing and aphids are actively feeding.

Sugarcane Aphid

Infestations of the sugarcane aphid spread like wildfire on grain sorghum from northern Mexico to Texas, into the Mid-South and across Alabama, Georgia and Florida. The pest has a phenomenal reproductive capacity and the ability to produce copious amounts of honeydew, resulting in rapid damage to entire fields. Transform was used on the majority of grain sorghum acres under an emergency Section 18 and provided effective control. Commercial experiences indicate that insecticide applications must be timed at the early onset of infestations, and optimizing coverage throughout the canopy is essential. If a grower can keep the populations contained to the lower third of the canopy, it is considered a “win.”

ccc-reviewPrepping For 2015

Although it is impossible to accurately predict what 2015 will bring, there are best practices that can be executed now to minimize some insect problems. Be sure to destroy cotton stalks as soon as possible after harvest to reduce populations of overwintered boll weevils. Fall tillage can destroy heliothis pupae buried inches below the soil surface. Application of a fall herbicide can reduce weed infestations that harbor insects.

As always, when the unknown pest problem does happen, have confidence in the region’s strong network of consultants, university Extension specialists and the industry to deliver solutions that help enable success.

More About The Author

  • B.S. degree in plant and environmental soil science – Texas A&M
  • M.S. degree in entomology – Louisiana State University
  • Doctor of philosophy in entomology – Louisiana State University
  • Currently insecticide biology team leader/technical expert, spinosyns and sulfoxaflor, North America MesoAndean Region – Dow AgroSciences Crop Protection Research and Development
  • Published articles in multiple journals, including Journal of Economic Entomology, Journal of Cotton Science and Journal of Agricultural Entomology, among others
  • Past president of the Mississippi Entomological Association
  • Enjoys life with husband, Jonathan, and daughter, Claire, 7