CONTENTS. 



Page. 



Introduction 7 



Experiments in fruit fumigation 11 



Apparatus 11 



Examinations of the scale insects 15 



Experiments in 1906-7 16 



Strength-of-gas series 17 



Length-of-exposure series 18 



Package series 18 



Variety-of-fruit series 22 



Rhode-Island-Greening-injury series 23 



Cold-storage series 24 



Tests of carbon bisulphid 26 



Experiments in 1907-8 27 



Package series, 1907-8 28 



Summary of results 30 



Conclusions and recommendations 32 



Appendix 33 



Synopsis of laws and decrees in force in foreign countries bearing on the 



introduction of live plants and fresh fruits 33 



Laws and regulations of the various States of the United States bearing on 

 the introduction, transportation, and sale of fresh fruits infested with 



the San Jose scale or other injurious insects 37 



Index 40 



ILLUSTRATIONS. 



PLATES. 



Page. 

 Plate I. Apples infested with San Jose scale. Fig. 1. — Baldwin. Fig. 2. — 



Esopus (Spitzenburg). Fig. 3. — San Jose scales Frontispiece. 



II. Apples infested with San Jose scale. Fig. 1. — Rhode Island Green- 

 ing. Fig. 2. — Same variety, showing also discoloration as result 

 of fumigation with hydrocyanic acid gas 22 



TEXT FIGURES. 



Fig. 1. Fumigation apparatus 13 



2. Fumigation apparatus 14 



3. Special barrel "header" for replacing lower barrel head in fumigating 



directly over discharge box 20 



5 



