BUREAU OF ENTOMOLOGY. 301 



laborfitor}', where the parasites have been liberated. Another tach- 

 inid or dexiid parasite of the adult beetle has also been found in 

 Japan and in Korea. The agents in Japan are also trying to rear 

 large niunbers of a parasitic wasp of the genus Tiphia which they 

 hope to send over soon. In Korea an early-season dexiid and Tiphia 

 parasites of several species have been found, the introduction of 

 which will be attempted as soon as possible. In order to insure 

 the best handling of these parasites, careful attention is being given 

 to their life history and habits as a basis for propagation in large 

 numbers. In addition to this work in Japan, the parasites of re- 

 lated insects in this country are being studied to see if some of them 

 can be made useful against this pest. Still another parasite will be 

 sent from Hawaii. 



Peach insects. — Work has been continued in the suppression of 

 the plum curculio, brown-rot, and scab of peaches in Georgia in co- 

 operation with the Bureau of Plant Industry and the Georgia State 

 Board of Entomology. Continued improvement in the situation 

 has resulted from this work. The harvest of 1922 was exceedingly 

 satisfactory from the growers' standpoint, and in orchards where 

 the bureau's recommendations for spraying, dusting, and other 

 control operations were carried out the fruit was practically free 

 from curculio grubs. 



At the urgent request of peach growers in the Sandhill peach 

 district of North Carolina, peach-pest control work was undertaken 

 the present spring in cooperation with the Bureau of Plant Industry 

 and the North Carolina State Department of Agriculture. The 

 spraying and dusting schedule found so effective in Georgia was 

 put in effect in the North Carolina territory with most excellent re- 

 sults. 



Considerable attention has also been given to further tests of para- 

 dichlorobenzene for the peach borer under varying seasonal con- 

 ditions and on trees of different ages. It appears that when prop- 

 erly applied this chemical can be utilized for the destruction of 

 the borer on trees 2 to 3 years of age and over, which materially 

 enlarges its range of usefulness and obviates almost entirelv the 

 necessity of worming peach trees. Experiments were made in the 

 fall of 1921 to determine the usefulness of paradichlorobenzene for 

 the destruction of the California peach borer on apricot, prune, 

 etc., in the Santa Clara Valley. The results obtained were very 

 gratifying and give hope that the chemical can be used effectively 

 on this serious pest. 



Apple insects. — Studies of the codling moth have been continued 

 along the lines previously followed in the Yakima Valley, Wash., 

 and Rogue River Valley, Greg., and additional information ob- 

 tained. The work under way for several seasons in the Ozarks and 

 in north Georgia has been completed, and in the latter State the 

 temporary station closed. Special attention has been given to ex- 

 perimental work with sprays and dusts in orchards to settle man}^ 

 practical points in connection with codling-moth control, such as the 

 comparative merits of spray guns and rods, best type of power 

 machinery to employ, value of stickers or adhesives in spray solu- 

 tions, and the like. New questions are constantly arising as to 

 spraying aiid dusting equipment, insecticides, etc., which are of much 



