ISHS Acta Horticulturae 367: VI International Symposium on Pear Growing
GEOGRAPHIC INFORMATION SYSTEMS AND SIMULATION IN REGIONAL ORCHARD MANAGEMENT: PESTICIDE RESISTANCE IN HOOD RIVER VALLEY, OREGON |
| Authors: | L. B. Coop, Brian A. Croft, H. Riedl, E. C. Burts |
| Abstract:
A geographic information system, GRASS 4.0, was used together with a simulation model to examine historical and predicted patterns of dispersal and regional pyrethroid resistance development by pear psylla, Cacopsylla pyricola Foerster. Land-use, land-cover data were combined with mapping data to allocate conventional sprayed, organic, and unmanaged pear orchards for the Hood River region. Simulation and independant survey results revealed a logarithmic pattern of initial resistance development. Model outputs including temporal and spatial trends of resistance development were plotted in relation to orchard management type. Management practices tested with model/GIS analysis were the proportion and location of organically managed orchards and the number of insecticide treatments per season. Surface interpolation and display of historical resistance survey data provided validation of modeled resistance development patterns. | |
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