AGRICULTURAL NATURE STUDY OUTLINES 
61 
II. COMMON INJURIOUS AND BENEFICIAL INSECTS 
By PROFESSOR E. O. ESSIG 
a. To Orchards 
1. Injurious 
(Deciduous) 
1. Wooly apple aphis ( Eriosoma lanigera). 
2. Green apple aphis ( Aphis pomi). 
3. Walnut aphis ( Chromaphis juglandicola) . 
4. European fruit lecanium or brown apricot scale ( Lecanium corni). 
5. San Jose scale ( Aspidiotus perniciosus). 
6. Oyster-shell scale ( Lepidosaphes ulmi). 
7. Pear thrips ( Taeniothrips pyri). 
8. Lesser shot-hole borer ( Xyleborus xylographus). 
9. Flat-headed apple tree borer ( Chrysobotliris femorata). 
10. Peach twig borer ( Anarsia lineatella). 
11. California peach borer ( Aegeria opalescens ). 
12. Spring cankerworm ( Palcacrita vernata). 
13. Red-humped caterpillar ( Schuura concinna ). 
14. Forest tent caterpillar ( Malacosoma disstria). 
15. Codling-moth ( Cydia pomonella). 
16. Pear or cherry slug ( Caliroa cerasi). 
(Citrus) 
17. Cottony cushion scale (Icerya pnrchasi). 
18. Gray citrus or citricola scale (Coccus citricola). 
19. Soft brown scale ( Coccus hesperidum). 
20. Citrus mealy bug ( Pseudococcvs citri). 
21. Black scale ( Saissetia oleae). 
22. Red scale ( Chrysomphalus aurantii). 
23. Purple scale ( Lepidosaphes heclcii). 
24. Fuller’s rose beetle (Pantomorus fulleri). 
h. To Grapes and Berries 
25. Grape leaf-hopper ( Erythroneura comes). 
26. California grape root-worm ( Bromius obscurus ). 
27. Currant or Gooseberry fruit-fly ( Epochra canadensis). 
28. Strawberry crown moth ( Aegeria rutilans). 
29. White-lined sphinx ( Celerio lineata). 
30. Raspberry horn-tail (Hartigia cressoni). 
c. To Garden 
31. Green pea aphis ( Macrosiphum pisi). 
32. Melon aphis ( Aphis gossypii). 
33. Squash bug ( Anasa tristis). 
