Apple (Malus domestica Borkh.) leaves were sprayed to runoff using a s
election of pesticides, and subsequent spray retention was evaluated b
y weight, Timing, cultivar, leaf surface, and leaf type significantly
influenced spray retention, Spray retention correlated significantly a
nd positively with leaf hair density. The importance of these differen
ces is considered in relation to the possible efficiency of the pestic
ide application process in apple orchards.