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Cotton -- Diseases and pests
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17
Boll weevil
11
Aerial spraying and dusting in agriculture
5
Pesticides
5
Agricultural engineering
4
Agriculture -- Economic aspects
4
Agriculture -- Research
4
Federal aid to research
4
Pests -- Control
4
Agricultural education
3
Agricultural machinery
3
Cotton
3
Crop science
3
Agricultural extension work
2
Insect pests
2
Spraying and dusting in agriculture
2
Agricultural experiment stations
1
Agricultural facilities
1
Airplanes
1
Cotton growing
1