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Subject
Agricultural pests -- Control -- Congresses
30
Apples -- Diseases and pests
15
Pears -- Diseases and pests
10
Codling moth -- Control
4
Pear psylla
2
Two-spotted spider mite
2
Apple aphid
1
Codling moth
1
Codling moth -- Control -- Oregon
1
European red mite -- Control
1
Spirea aphid
1