Posted 7/28/2010 15:41 (#1291563 - in reply to #1291439) Subject: RE: 50 is too soon
The 250 university threshold presumes it takes 3 or 4 days to get the sprayer organized and in the field when they expect there to be 1000 by then. 50 may never get that big and then, especially early you also have killed the beneficial insects that could control the small infestation.
Spray aphids or wait
