70 



All we can do at present is to grub up all infested plantations and 

 start on fresh land with guaranteed clean stock. 



Various sprays, and in fact all known methods of treatment have 

 been found ineffectual. 



These. I consider, three very important European fruit-tree pests 

 to be kept in mind, not only because they can easily be imported, but 

 because all three are very difficult to light, and the last mentioned ha<- 

 so far baffled all attempts to destroy it. 



THE CHERRY FRUIT FLY. 

 [Rfoagoletis cmgidata Loew.) 



By F. H. Chittenden. 



During June, 1901 and 1902, Dr. A. M. Farrington. of the Bureau 

 of Animal Industry, furnished a lot of cherries infested by a maggot 



h e 



Fig. 17. — Rhagoletis cingulata: a, fly: b, oiaggor from side: c, anterior spiracles of same: <1. puparixun; 

 e, posterior spiracular plates of pupa: all enlarged (original). 



which was subsequently reared by the writer, and proved to be Rha- 

 goletis cingidata Loew. Injury had first been noticed in 1899 and had 

 been continuous since that time. About two-thirds of the cherries 

 on his place in the District of Columbia were destroyed in 190:2. 

 Injury was seldom detected until the third week of June, when the 

 cherries were ripe. In our rearing jars the flies issued through the 

 month of April of the following years, but from the fact that the 

 larva? attain full growth by the beginning of the last week of June, 

 there can be little doubt that the flies issue normally during the latter 

 part of May or early June. Attack was noticed only to Montmorency 

 cherry, a nearly black variety, with a sour and rather unusually strong 

 Prussic-acid flavor.. There can not well be more than a single genera- 

 tion of this species on cherry, the larva? leaving the fruit during the 

 last week of June and first of July, and remaining in the earth until 

 the following spring or early summer. During the season of 1903, 



J 



