386 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



the ciirculio campaign. It has been found that by carefully picking 

 up wormy peaches from under the trees for a period of three to four 

 weeks, a saving of fruit can be effected which, after deducting the 

 cost of the work, amounts to about $50 per thousand trees. In ad- 

 dition to the saving on the current crop the beneficial results of 

 the work accumulate from season to season. Knowledge of the life 

 history of the plum curculio in Georgia is now very complete and 

 the results of studies of this subject will soon be prepared for pub- 

 lication. 



Further tests of paradichlorobenzene for the control of the peach 

 borer indicate that this chemical may be used on peach trees 3 years 

 of age and over without injury to the trees. This materially extends 

 the range of usefulness of this product, which has heretofore been 

 recommended for trees 5 years of age and over. 



The good results obtained from the use of lubricating-oil emulsion 

 in the control of the San Jose scale on apple in the Ozarks and else- 

 where led to tests of the oil in the control of this pest on peach, in 

 comparison with other standard scale treatments. To date no in- 

 jury to the trees has been discerned, but further observations will 

 be required before the lubricating-oil emulsion can be recommended 

 for the control of this scale on peach. 



Apple insects. — The work at the Benton ville, Ark., laboratory has 

 been directed largely toward further tests and improvements of 

 lubricating-oil emulsion for the control of the San Jose scale, as this 

 pest continues to be a serious menace to orchards of that section. 

 This oil emulsion has already come into large use in the commercial 

 apple orchards of the Ozarks without any evidence thus far of in- 

 jury to the trees treated, and has proved to be eminently satisfactory 

 in destroying the insect wlien applied during the dormant season.. 

 Some attention has also been given to the codling moth to round 

 out work already done as a basis for a bulletin on the control of this 

 insect under conditions in that region. Large-scale experimental 

 spraying work was undertaken in the Arkansas Valley at Wichita, 

 Kans., in cooperation with the Kansas Agricultural Experiment Sta- 

 tion. Unfavorable weather conditions have greatly interfered with 

 the prosecution of this work. In the Ozark region certain leaf- 

 hoppers are injurious to apples to an unusual extent, and these 

 have been under investigation for the past two or three years. 

 Sufficient data have been accumulated on these leafhoppers to war- 

 rant the preparation of a manuscript for publication. This will 

 include careful biologic studies and methods of control in orchards. 



At the Yakima, Wash., station, codling moth investigations have 

 been continued, and special attention has been given to obtaining 

 information on various practical points, as the value of spreaders 

 or stickers, comparative efficiency of spray guns and spraj'' rods, and 

 especially to further perfecting a spraying schedule for the control 

 of this insect under conditions in the Yakima Valley. In addition 

 to arsenate of lead, other arsenicals have been tested, as calcium 

 arsenate, zinc arsenite, etc. A manuscript on the life history of 

 the codling moth in the Yakima Valley is now in course of publica- 

 tion and a Farmers' Bulletin on the control of the insect in the 

 Pacific Northwest has been submitted, which when published will be 

 of much value to the orchardists of the territory mentioned. 



