Arizona Russian Wheat Aphid Survey, 1991

Russian wheat aphid (RWA) were found for the first time in Mohave county, bringing, to seven of the fifteen counties in the state that have now reported incidence of the pest. RWA presence in the southeastern part of the state came about a month later than was noted in 1990, and in most cases didn't reach threshold numbers until after heading. Hence, only 23 %© of the fields surveyed were sprayed. Economic damage was considered lighter than usual throughout the state.