ILLUSTRATIONS. 



PLATES. 



Page. 



Plate I. The San Jose scale and its work: Fig. 1. — Peach tree with top killed * 

 by the scale. Fig. 2. — Peach twig, moderately infested, showing 

 male and female scale. Fig. 3. — Peach limb badly infested with 



scale 8 



II. Map of China and Japan, to illustrate geographical position in relation 



to native home and distribution of San Jose scale 12 



III. Fig. 1. — Japanese apple orchard, showing trellis method of training. 



Fig. 2. — Old native pear orchard of Japan, showing method of 

 training 12 



IV. Fig. 1. — Pony fruit cart in which products of the hill country are 



brought into Pekin, China. Fig. 2. — Portion of street devoted to 



sale of fruits in Pekin, China 14 



V. Life zones of the United States 34 



VI. Fig. 1. — Large apple' trees with lower limbs killed by the San Jose 

 scale, Youngstown, N. Y. Fig. 2. — Apple infested with San Jose 



scale 34 



VII. Pupating larvae of Chilocorus similis on the terminals of twigs in 



Department orchard 66 



VIII. Cages used in breeding Asiatic ladybird ( Chilocorus similis) 66 



IX. Steam plants for cooking lime-sulfur wash 74 



TEXT FIGURES. 



Fig. 1. Map of the United States, showing localities known to have been 



infested with the San Jose scale up to 1896 19 



2. Aspidiotus perniciosus: appearance of scale on bark 35 



3. Aspidiotus perniciosus: young larva and developing scale 44 



4. Aspidiotus perniciosus: development of male insect 46 



5. Aspidiotus perniciosus: adult male 47 



6. Aspidiotus perniciosus: adult female 48 



7. Aspidiotiphagus citnnus 60 



8. Prospalta aurantii 61 



9. Ablerus clisiocampse: female 61 



10. Microweisea (Pentilia) misella: adults, larvie, pupie 63 



11. Chilocorus similis: oviposition and early larval stages 65 



12. Chilocorus similis: later larval stages, pupa, adult 66 



6 



