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WHOLE-FARM INFESTATION TRENDS AND MANAGEMENT PROGRAMS FOR OBLIQUEBANDED LEAFROLLER IN APPLES
 

Summary: WHOLE-FARM INFESTATION TRENDS AND MANAGEMENT PROGRAMS FOR
OBLIQUEBANDED LEAFROLLER IN APPLES
2008
Arthur M. Agnello and W. Harvey Reissig
Dept. of Entomology, NYS Agric. Expt. Sta., Geneva, New York 14456
Abstract
Because of an incomplete understanding of the role of habitat, alternate hosts, and adult
movement in NY fruit infestations by obliquebanded leafroller (OBLR), we wished to obtain a
temporal and spatial picture of summer larval re-infestation patterns. In 2007, an unrealistically
aggressive early season spray program was used to eradicate overwintered larvae on 3
commercial farms (1732 acres) with a history of OBLR injury. Summer generation adults were
monitored using a network of pheromone traps located at different orchard strata on all 4 ordinal
sides. Weekly terminal and fruit samples were taken at each station. Although large numbers of
adults were caught, larval terminal infestations and fruit damage remained low in all blocks.
There were no substantial differences in adult catches, larval infestations or fruit damage in the
different orchard strata. This suggested the utility of developing a sampling plan for the summer
OBLR generation based on fruit damage rather than the traditional sampling of larvae on
growing terminals. In 2008, methods above were repeated on 6 farms (2040 acres) and
participating growers agreed to leave small plots untreated with no sprays against summer larvae
until the first damaged apple was observed. These small plots and at least two other areas being

  

Source: Agnello, Arthur M. - Department of Entomology, Cornell University

 

Collections: Biology and Medicine