Regarding fall armyworm in pastures and
hay, the pyrethroid insecticides are commonly used as they are effective and
generally less costly, due to some being available as generics.
Pyrethroid insecticides can be recognized by their active ingredient which ends
in “thrin” and include beta-cyfluthrin, cyfluthrin, gamma and lambda cyfluthrin
and zeta-cypermethrin. Prevathon and Besiege can provide longer residual
control but can be more expensive than pyrethroids. Intrepid, Tracer and
Dimilin should be applied when armyworms are small, , less than ½ inch.
Dimilin is sometimes added to a pyrethroid insecticide to extend the control
period.
Fall armyworms can also damage fall
planted small grains and other forage grasses. The insecticides labeled
for these crops can be different than those listed here for pastures and hay.
Fall armyworms can be active through
October and even into early November if temperatures remain warm.
As always, check products before you purchase to make sure they fit your need. Read the label to ensure you use the correct amount for the most effective control. Also follow container disposal procedures when container is empty.
