INSECTS INJURIOUS TO STONE FRUITS 



667 



ground before spreading to the rest of the tree or other trees, so 

 that prompt treatment when first observed will prevent general 

 infestation. 



Control. Spraying with kerosene emulsion, whale-oil soap, 

 tobacco extracts, or dilute miscible oils, as for the apple-aphis 

 (p. 658), will control the pest. 



The Cherry Fruit-fly f 



The cherry fruit-fly is a native insect whose maggot lives in 

 the flesh of the cherries, causing them to rot. It is very nearly 

 related to the apple maggot (p. 632) which it very closely resembles 



FIG. 512. The cherry fruit-fly (Rhagoletis dngulata Loew.) : a, fly; b, maggot; 

 c, anterior spiracles of same; d, puparium; e, posterior spiracular plates 

 of pupa all enlarged. (After Chittenden, U. S. Dept. Agr.) 



in both appearance and life history. Injury by it has been 

 recorded in Massachusetts, New York, Ontario, Pennsylvania, 

 District of Columbia, Michigan and Iowa, so that it is probably 

 generally distributed over the northeastern States. Although 

 its native food-plant is unknown it is probable that it lives on some 

 wild sour cherry. As cherries are always more or less injured 



f Rltagoletis dngulata Loew. Family Trypetidce. See M. V. Slingerlaml, 

 Bulletin 172, Cornell Univ. Agr. Exp. Sta.; F. H. Chittenden, Bulletin 44* 

 Bureau of Entomology, U. S. Dept. Agr., p. 70. 



