FORTIETH ANNUAL REPORT. 181 



(3) With self-boiled lime-sulphur alone, four to five weeks before the 

 fruit ripens. 



Late varieties. — The Sal way. Heath, Bilyeu, and varieties with a simi- 

 lar ripening period should be given the same treatment prescribed for 

 midseason varieties, with an additional treatment of self-boiled lime- 

 sulphur alone, to be applied three or four weeks after the second appli- 

 cation. 



Early varieties. — The Greensboro, Carman, Hiley, Mountain Rose, 

 and varieties having the same ripening period should receive the fii^st 

 and seeonf! applications prescribed for mids^eason varieties. 



Where the curculio is not particularly bad, as in Connecticut, western 

 New York, and Michigan, the first treatment, which is for this insect 

 onlv, mav be omitted. Also for numerous orchards throughout the 

 Middle States where the insect, especially in the younger orchards, is 

 not yet very troublesome, orcharists should use their judgment as to 

 whether the first application may be safelj^ omitted. Where peach scab 

 is the chief trouble, and brown-rot and curculio are of only minor impor- 

 tance, as may be the case in some of the Allegheny Mountain districts, 

 satisfactory results may be had from two applications, namely, the first 

 with self-boiled lime-sulphur and arsenate of lead four to five weeks 

 after the petals fall, and the second treatment of the above schedule with 

 self-boiled lime-sulphur alone three to four weeks later. These two treat- 

 ments, if thoroughly applied, will control the scab and brown-rot, 

 especially on the early and midseason varieties, and will materially re- 

 duce curculio injuries. Even one application of the combined spray made 

 about five weeks after the petals fall would pay well, although this is 

 recommended only for conditions where it is not feasible to do more. • 



PEACH DISEASES AND RE-ESTABLISHMENT OF YOUNG 



ORCHARDS IN MICHIGAN. 



PROF. INI. B, WAITE^ PLANT PATHOLOGIST, U. S. DEPT. OF AGRICULTURE^ 



WASHINGTON^ D. C. 



Many of you know that, in co-operation with Prof. Taft, through his 

 deput}', Mr. H. G. Welch, we carried out a three years' test of wbat is 

 known as the '•'extermination" method for getting rid of the "yellows" 

 and the reduction was fairly successful at the time. Furthermore, I 

 have told you about the control of tbe brown rot and black rot by summer 

 spraying of the peach so that we feel that the old line diseases of the 

 l>each are now fairly controllable — the "yellows" by destruction and the 

 "yellow spot" or "brown rot" by spraying. It is true that the "curl 

 leaf" is a disease of prime importance, but it is under control by spray- 

 ing and the methods are well known, so the problem that we have to 

 dispose of and solve is along a little different line. 



When it comes to the question of the re-planting of peaches and the 

 recovery of the peach industry in the state of Michigan, I feel that it 

 is one of the great horticultural problems of this section, one of the 

 greatest problems of this country wherever peaches are raised. When 



