Weeds. Pre-emergent herbicides (Karmex, Princep) are applied to the orchard floor (tree row and middles) in
split applications, one in the fall and one in the spring, using one-half the maximum rate per application.
Surviving weeds are controlled with three spot sprays – April, June, August – with Roundup. Karmex and
Princep are regulated under the Groundwater Protection Regulations. Check with your farm advisor or PCA
prior to applying.