The document discusses various insects that affect plants in Colorado, grouping them into three categories. It provides details on aphids, army cutworms, borers, boxelder bugs, cabbage loopers, codling moths, and other insects in Group I. Group II covers the Colorado potato beetle, Cooley spruce gall adelgid, earwigs, eriophyid mites, grasshoppers, and Ips beetles. Group III includes the Japanese beetle, leaf cutter bees, leafhoppers, leafminers, pearslug, pine tip moth, and pinon pitch mass borers. Control and identification information is provided for many of the insects.

1. Insects that Affect Plants in Colorado

7. Aphid Apple Aphid

8. Aphids

9. Aphid Curling & Distortion

10. Aphids on Geranium

11. Army Cutworm Euxoa auxiliaris

15. Borers

16. Their larvae bore through the bark and tunnel extensively in the wood

17. Ash Borers

18. Roundheaded borers attack twigs and small branches as well as the trunk

19. Flat headed Wood Borers The adult beetles have hard shells with a metallic lustre. The heads of the larvae are expanded and flattened Spiral Swellings

20. Peach Tree Wood Borer

22. Cabbage Looper

24. Cabbageworm Artogeia rapae

25. Codling Moths

28. ID from photographs

36. Colorado Potato Beetle

40. Cooley Spruce Gall

41. Earwigs

44. Eriophyid Mite damage Ash Flowers

45. Eriophyid damage on Aspen

46. Grasshoppers

48. Ips Beetle

56. ID

64. Survey and Control of the Japanese Beetle in Mesa County. United States Department of Agriculture Animal and Plant Health Inspection Service Program Aid No. 1599

65. The Japanese Beetle Was First Introduced into the United States on Nursery Stock From Japan, in 1916. Attempts to control it failed. By 1932, populations were found as far west as St. Louis. New Jersey, 1916 USDA 1998 St. Louis, 1932

66. Japanese Beetles in Colorado (CSU)

90. Watch out for this guy

101. Leafhopper

102. Potato leafhopper damage

103. Leafminer Damage

107. Pearslugs - Pear Sawfly Caliroa crasei

111. Pearslug damage

112. Pine Tip Moth Damage

113. Pine Tip Moth Rhyacionia

116. Pinyon Pitch Mass Borer

119. Pinon Pitch Mass Borer Damage

121. Brown Scale & Honeydew Coccus hesperidum

124. Black Pineleaf Scale

125. Spider Mites

127. http://www.hortnet.co.nz/key/keys/info/lifecycl/tsm-web.htm

131. Squash Bug

134. Thrips

135. Onion Thrips Nymphs

139. Tomato Hornworm

145. Galls on roots of apple tree infested with woolly apple aphid

146. Elm Apple

148. ID By Photograph

156. Group IV