In the spring of 1956 a serious infestation of American plum borer, Eusophera semifuneralis (Wlk.), and pear borer, Thanmosphecia pyri (Harr.), was found in Summer Rambo (9-year-old) and Lodi (]5-year-old) apple trees. Sprays of dormant oil ;2 qts.+Gamtox® (10% gamma isomer of BHC w.p.) or Isotox® (20%gamma isomer of BHC from lindane) =to 1 lb. BHC 10% gamma, gave only 60% control, when applied with an orchard broom. Subsequently (1957), sprays of 15% parathion at :2lbs. w.p.or 1 pt. of 47.5% Para/low®(water emulsion containing 4lbs. parathion per gallon) emulsion applied at 400 p.s.i. with shadetree guns gave perfect control of borers, without reinfestation for a 2-year period.
Document Type: Research Article
Publication date: April 1, 1960
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