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Reports of Aphids and Army Worms

May 16, 2019

On May 8th, FMC’s Technical Rep Nick Hustedde, was rating a wheat trial in Carlyle, IL.  He noticed that Bird Oat Aphids were increasing in population.
 
Bird Cherry Oat Aphid Notes:
  • Fall moisture can improve host plant and aphid development (plenty of fall moisture last year)
  • Bird Cherry Oat Aphids are known to transmit BYDV in the fall and overwintering aphids can continue spring transmission.
  • See the attached HatchTrak for more details on aphids in wheat.
  • Threshold -- when aphid numbers meet or exceed 10 aphids / ft of row (Nick counted as high as 24 in Carlyle, IL on 5/8/19).
 
True Armyworm Notes:
  • Consecutive weeks of cool wet weather in the spring are conducive for armyworm development as predator and parasite activity is reduced.
  • After hatch, feeding occurs mostly at night and each larvae could potentially consume 3 whole wheat plants.
  • Wheat yield is typically impacted when flag leaves are fed upon before soft dough stage.
  • As plants mature armyworm may shift feeding to wheat beards and clip heads. After wheat has matured, migration may occur to corn or grain sorghum fields.
  • Threshold – 3 armyworms / sq ft
 
Why Mustang MAXX insecticide is your best choice to control these pests?
  • Provides more consistent efficacy on later armyworm instar larvae when applied @ 4 oz (check labels to compare)
  • Provides fast knockdown and excellent residual on both of these pests
  • Shortest PHI in wheat à 14 days (vs. 30 days for others)


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