THE CANADIAN ENTOMOLOGIST 19 



and thorough. If this work is well done, only in very badly in- 

 fested orchards will it have to be repeated. In the latter case the 

 best time to give the extra application will be in about 12 or 14 

 days after the one just mentioned. Plums and cherries should be 

 sprayed with the sam.e mixture, first, as soon as the fruit has set and 

 the calyces have fallen, and then again in about two weeks' time. 

 Occasionally a third application two weeks later may be desirable. 

 Peaches should be sprayed soon after the fruit is well set and all 

 the enveloping parts of the flower have dropped, so that the poison 

 can cover the whole fruit. No lime-sulphur should be used, but 

 only water or water w ith 1 or 2 lbs. of freshly slaked lime to every 40 

 gallons. One spra} ing is sufficient for Ontario conditions if well 

 given. Many peach orchards do not require any spraying for this 

 pest. 



It is well to remember that all the above methods should be 

 combined in the control of the Plum Curculio, for spraying alone 

 though it will reduce the number of the insects will not thoroughly 

 control them, and experience has shown that cultivation and clean 

 conditions in and around the orchard are of very great value. 

 Jarring used to be recommended, but in the writer's opinion is im- 

 practicable under modern conditions of fruit-growing. 



THE SHELL-BARK HICKORY MEALY-BUG. 



BY A. H. HOLLINGER, UNIVERSITY OF MISSOURI, COLUMBIA, MO. 



(Continued from vol. XLVIII, page 413.) 

 Description of Adult Female. 



Adult female ivhen mounted: varying from 2.6 mm. x 2.2 mm. 

 (at the beginning of oviposition) to 5.7 mm. x 2.4 mm. (at the 

 height of oviposition). Beak well developed and two-segmented, 

 about 175 X 235 microns, the distal segment being about as 

 long as the beak is wide; numerous setae are borne on the beak; 

 innumerable body setae, averaging about 50 microns long, occur on 

 both surfaces of the derm; in addition, innumerable, small (2 to 3 

 microns), obscurely triangular gland-pores occur all over the derm; 

 also some slightly larger, circular gland-pores are in the cephalic 

 region, and also along each abdominal segment and scattered 



January, 1917 



