Columbia subject headings:
Insect pests--Canada--Identification--Pictorial works.
Insect pests--Canada--Identification.
Insect pests--United States--Identification--Pictorial works.
Insect pests--United States--Identification.
Ornamental shrubs--Diseases and pests--Canada.
Ornamental shrubs--Diseases and pests--United States.
Ornamental trees--Diseases and pests--Canada.
Ornamental trees--Diseases and pests--United States.
Harvard subject headings:
Insect pests--Canada--Identification--Pictorial works.
Insect pests--Canada--Identification.
Insect pests--Canada--Pictorial works.
Insect pests--United States--Identification--Pictorial works.
Insect pests--United States--Identification.
Insect pests--United States--Pictorial works.
Ornamental shrubs--Diseases and pests--Canada.
Ornamental shrubs--Diseases and pests--United States.
Ornamental trees--Diseases and pests--Canada.
Ornamental trees--Diseases and pests--United States.
Princeton subject headings: