350 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



an uneven batch the parasite breeds uninterruptedly throughout the 

 year and, having many generations to one of the host, is soon able to 

 overcome it. 



The work has already progressed to a point where it is safe to con- 

 clude that it will be of immense practical value in the control of the 

 black scale, since there are extensive areas where scale conditions are 

 conducive to the iminterrupted breeding of Aphycus lounshuryi. Even 

 in the interior, where the problem is more difficult on accoimt of the 

 even hatch, there is reason for optimism, because the problem there 

 is simply a question of quantity production of natural enemies in in- 

 sectaries with which to restock the orchards occasionally. Sufficient 

 progress has been made on this phase of the work to justify the belief 

 that it can be worked out to a successful conclusion. The most ser- 

 ious obstacle to success in some districts is the presence on the trees 

 of other species of scales which are not destroyed by the enemies of the 

 black scale and which consequently require fumigation. It is hoped 

 that this obstacle may be overcome in part by resorting to spraying, 

 which is much cheaper than fimiigation, and by the propagation and 

 distribution of the natural enemies of these other scales, a study of 

 which is already under way. 



An interesting development in this project, both from a biological 

 and economic standpoint, is the enormous increase of secondary par- 

 asites since the introduction of Aphycus. Two species particularly, 

 Quaylea whittieri Timberlake and an undescribed species of Eusemion, 

 the former normally a secondary on Scutellista and other parasites, 

 the latter a secondary on parasites of Coccus hesperidum, have increas- 

 ed to enormous numbers in the orchards where Aphycus has been es- 

 tablished. Just what effect they will have on the practical outcome of 

 the work is of course problematical. 



THE JAPANESE BEETLE QUARANTINEi 



By C. W. Stockwell, Riverton, N. J. 



From observations and results accomplished by the quarantine reg- 

 ulations in force against the Japanese beetle for the past two years it 

 seemed advisable to continue this quarantine work, in an endeavor to 

 hold the beetle in check and prevent if possible its widespread distribu- 

 tion over the United States until some adequate means of control might 

 be found. 



'Published by permission of the Secretary of Agriculture. 



