THE MONTHLY BULLETIN. 



'ji. 



THE CHERRY FRUIT SAWFLY. 



Jlophtcantpa ccokd (Clarke). 



(Dolerus conkei Clarke.) 



( llnplvcdmpa cdlifornica Rohwtr. > 



Order — Hymenoptera. Family — Tenthredinidae. 



By E. O. EssiG, Secretary, State Commission of Horticulture. 



Summary. 



1. The cherry fruit sawfly is a native of California and other Pacitic 

 Coast states and has been known since 1883 in the Suisun Valley, Cal. 



2. Considerable damage to young cherries has been done in various 

 sections by the larvae of this insect and occasionally, at least, control 

 measures may be necessary. 



3. The presence of the insect may be told by the small round holes 

 bored in the young green cherries, many of Avhich soon drop to the 

 ground. 



4. The larva' are small, "white and average about one fourth of an 

 inch in length. The adults are four winged insects, black with bro^vnish 

 or reddish appendages, about one eighth of an inch long. 



5. Control measures have not been thoroughly perfected but two 

 applications of arsenate of lead at the rate of 4 to 5 pounds to 100 

 gallons of water, the first application to be made shortly before the 



Fig. 2. — Work of the cherry fruit sawfly, 

 Hoplocampa cookei (Clarke), on young cher- 

 ries. Natural size. (Original.) 



blossoms open and the second about ten days later, have proven effective. 

 Fall plowing is also recommended to kill the larvge and pupae in the 

 soil Avhrle a distillate-oil emulsion and nicotine spray is recommended 

 to kill adults at time of egg-laying. 



6. The insect has been reported as occurring in the Suisun Valley, 

 El Dorado and Nevada counties, California, and at Medford, Oregon, 

 w^here it is confined to a very small area. 



7. The orchard fruits attacked are cherry (sweet and sour), prune, 

 plum, peach and apricot (the peach and apricot only occasionally). 



