Subject
Control
25
Forest insects
25
Spruce budworm
9
Congresses
5
Diseases and pests
5
Forests and forestry
5
Insecticides
5
Pests
5
Aerial spraying and dusting in forestry
4
Trees
4
Bacillus thuringiensis
3
Environmental aspects
3
Forest protection
3
Toxicology
3
Biological control
2
Pesticides
2
Economic aspects
1
Forest insects -- Control -- Computer simulation
1
Forest management
1
Gypsy moth
1
History
1
Insect pests
1
Insects
1
Pest control
1
Pine
1
Science
1
Social aspects
1
Spruce
1
Spruce budworm -- Control -- Computer simulation
1