Friday, June 5, 2009
Wheat head armyworm (Faronta diffusa) survey
I collected moths from the armyworm traps on Tuesday. The pheromone traps seemed to be more effective at attracting our target species wheat head army worm (Faronta diffusa) than the attractant traps. There were more moths in them and less other insects or moths. Yesterday we had thunderstorms and a hard rain. I will go and check the trap conditions later today to see if they are still intact. More thunderstorms in the forecast for today.
I am not seeing any armyworm larvae yet. I did find low numbers of leafy feeding sawflies in one location near Myrick, Oregon. (2 larvae per 10 sweeps.)
If the populations of army worms reaches a significant population to damage wheat heads there are several control options. Preharvest intervals (PHI) are a concern and should be carefully followed. One option, zeta cypermethrin (Mustang Max) has a wheat only label, is known to be effective on armyworms in general, and has a 14 day PHI. For more recommendations check out the online version of the Pacific Northwest Insect Management Handbook. http://insects.ippc.orst.edu/pnw/insects