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Subject
Pear -- Diseases and pests -- Oregon
2
Psylla -- Biological control -- Oregon
2
Miridae -- Effect of insecticides on
1
Pear -- Diseases and pests -- Integrated control -- Oregon -- Hood River Valley
1
Psylla -- Control -- Oregon -- Hood River Valley
1
Psylla -- Insecticide resistance
1
Psylla -- Oregon
1