SUMMARY OF IXSECT CONDITIONS DURING 1921. 



31 



CAMPHOR SCALE. 



(Pseudaonidia duplex Ckll.) 9 



The camphor scale was first discovered in the United States at Xew 

 Orleans in August, 1920, by E. R. Barber of the Bureau of Ento- 

 mology. At that time it appeared to be infesting only the plants 

 within a few blocks of the M. Cook nursery. It seems possible that 

 this insect had been introduced on a Japanese rose through a Los 

 Angeles nursery. In April. 1921, the infestation was survej^ed and 

 was then found to cover 27 city blocks. In early May a hurricane 

 blew the y oung 

 crawlers long dis- 

 tances in all direc- 

 tions, and in one 

 case they were 

 found, after the 

 storm, nearly 2 

 miles from the 

 center of infesta- 

 tion. During the 

 summer the city 

 of Xew Orleans 

 and the State of 

 Louisiana appro- 

 priated $33,000 in 

 an effort to con- 

 trol the spread of 

 this pest, which 

 was threatening 

 the camphor trees, 

 one of the most 

 beautiful land- 

 scape features of 

 Xew Orleans. 

 With these funds 

 an effort was made 

 to hold the pest to an area of about 4 square miles, and during this 

 campaign more than 600 isolated infestations in various parts of the 

 city were cleaned up. 



On July 18, 1921, this insect was discovered for the first time in 

 Mississippi at Hattiesburg on plants that were traced to shipments 

 from Xew Orleans, made, two years previously. The State plant 

 board immediately took this outbreak in hand and condemned and 

 burned all infested plants. On August 13. another infestation was 

 located in Mississippi at Jackson, this also being traced to material 













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Fig. 15. — Geographical distribution of the camphor scale in 

 the United States in 1921 : The black area indicates the 

 New Orleans infestation ; the stars indicate areas where the 

 scale has been found and eradicated. 



5 From reports of E. R. Barber, R. W. Harned, and T. H. Jones. 



