Category Archives: Insects

Heat unit accumulation during 2017

Author: Tyson Raper, Cotton & Small Grains Specialist Comments Off on Heat unit accumulation during 2017

Heat unit accumulation has been the big question over the past week.  Mild temperatures settled over Tennessee during early August and there is some concern that the crop may not be maturing as quickly as noted in years past.  While I agree the weather has been quite comfortable, we are currently very close to the 30 year average heat unit accumulation trend noted from 1980-2010.

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Don’t freak out about Japanese beetles

Author: Scott Stewart, IPM Extension Specialist Comments Off on Don’t freak out about Japanese beetles

They’re back, but they don’t scare me! It is very unusual to see economic damage from Japanese beetles in cotton, soybean, or corn. They may cause defoliation in all crops. I’ve never seen enough defoliation in cotton or corn to justify treatment. On a few occasions, I’ve seen enough defoliation in soybean to catch my attention. They will hang around for a while, so in combination with other defoliators, they may cause enough damage Continue reading

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Southwestern Corn Borer in Non-Bt Corn

Author: Scott Stewart, IPM Extension Specialist Comments Off on Southwestern Corn Borer in Non-Bt Corn
SWCB Larva (click to enlarge)

Moth traps catches clearly indicate that the first generation flight is peaking (link to moth trap catches). Local moth catches may vary considerably, and that is why we suggest running pheromone traps on your farm if you are growing non-Bt corn. The highest trap catches are on farms in U.S. Fish and Wildlife Refuges, primarily because they are not allowed to grow Bt corn. Please link to the publication below for more information about the management of this pest.  Below, I’ve also provided the suggested treatment threshold for southwestern corn borers in non-Bt corn during the whorl stage. Continue reading

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2017 Insect Control Recommendations for Field Crops

Author: Scott Stewart, IPM Extension Specialist Comments Off on 2017 Insect Control Recommendations for Field Crops

pb1768The University of Tennessee’s 2017 Insect Control Recommendations for Cotton, Soybean, Corn, Sorghum, Wheat and Pastures (PB 1768) is now available online.  Once available, hard copies will be distributed at Cotton Focus, grain conferences, and other crop production meetings.

Some features you may have overlooked in the back of the book include:

  • Listing of insecticide classes (mode of action) and registration numbers
  • A list of common “generic” trade names for various insecticides
  • Tables ranking the relative efficacy of insecticides on common pests
  • Tips to minimize pesticide effects on pollinators
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Southwestern Corn Borers in Corn

Author: Scott Stewart, IPM Extension Specialist Comments Off on Southwestern Corn Borers in Corn

Below is an exact repeat of an article last year, actually on the same date, which is reminder that our first and second generation flights of southwestern corn borer (SWCB) tend to occur at the same time each year. Continue reading

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Tarnished plant bugs get an early start

Author: Sandy Steckel, Extension Assistant Comments Off on Tarnished plant bugs get an early start

Tarnished plant bugs are the #1 insect pest of cotton in Tennessee. In the fall of the year, tarnished plant bug (TPB) nymphs develop into adults on weedy hosts in response to decreasing day lengths (Snodgrass 2014).   Continue reading

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