Subject
Bacillus thuringiensis
19
Spruce budworm
13
Control
9
Aerial spraying and dusting in forestry
7
Biological control
4
Forest insects
3
Biocides
2
Environmental aspects
2
Pest management
2
Acleris variana
1
Aquatic invertebrates
1
Benthic animals
1
Benthos
1
Biological insecticides
1
Congresses
1
Diflubenzuron
1
Diseases and pests
1
Effects of insecticides on
1
Forest insects -- Control -- Computer simulation
1
Hemlock looper
1
Insect pests
1
Insecticides
1
Spruce budworm -- Control -- Computer simulation
1
Testing
1
Trees
1