LIME-SULPilUK PKEPAKATIONS FOR APPLE DISEASES. 11 



cially plat 2, began to sliow considerable foliage injury after the second 

 application, ami on this account the solution was diluted to contain 

 oidy 1 gallon in 40 gallons of water for the last two sprayings. 



RESULTS OF THE TREATMENT. 



Soon after the second application was made, according to 

 Mr. Braucher's notes, the commercial lime-sulphur plats began to 

 show foliage injury. Notes made at intervals during the season 

 show that the foliage was quite badly injured by the lime-sulphur 

 solution and Paris green combination and that the solution without 

 an arsenical caused almost as much damage, while the same solution 

 with arsenate of lead was mucli less injurious. Although the damage 

 caused by the lime-sulijhur and arsenate of lead combination was 

 not severe, it was sufhcient to discourage the use of the solution 

 at the strength of 2 gallons to 50 gallons of water. A strength of 

 \h gallons to 50 gallons of water, with arsenate of lead, proved to 

 be practically noninjurious in Virginia and would probably be safe 

 in Michigan. The self-boiled lime-sulphur mixture with arsenate of 

 lead caused no damage whatever. 



The following table shows the efficiency of the several spray mix- 

 tures in preventing apple scab on the Wagener variety, as determined 

 by sorting and counting the fruit from eight trees in each plat: 



Table II. — Comparison of results of the use of lime-sulphur sprays with Bordeaux mixture 

 in the prevention of scab on Wagener apples at Douglas, Mich. 



No. of 

 plat. 



Spray iiii.xture used. 



Commercial lime-sulphur .solution (2 to 50) 



Commercial lime-sulphur solution (2 to .'iO) and (! ounces of Pans green 



Commercial lime-sulphur .solution (2 to .')()) and 2 pounds of arsenate of lead. 

 Self-boiled lime-sulphur solution (lO-10-.JO) and 2 pounds of arsenate of lead . 



Bordeau.x mixture (3-4-50; and 2 pounds of arsenate of lead 



Check; not sprayed 



Scabby 

 fruit. 



Per cent. 

 0.37 

 2.23 

 3.90 



19.48 

 3.43 



81.18 



As shown in the above table, the scab was held down to an average 

 of 4.2 per cent of the crop by the commercial lime-sulphur solution, 

 to 3.43 per cent by the Bordeaux mixture, and to 19.48 per cent by the 

 self-boiled mixture, while 81 per cent of the unsprayed fruit was 

 scabby. (See PI. III.) This experiment, as well as those conducted 

 in Virginia, shows that the lime-sulphur solution is as effective in 

 preventing apple scab as Bordeaux mixture, while the self-boiled 

 wash is not so good in this connection. The arsenate of lead in the 

 commercial lime-sulphur solution held the codling moth down to 1.6 

 per cent of the crop and in the case of Bordeaux mixture to 5.6 per 

 cent, thus indicating that the lime-sulphur does not injuriously affect 

 the poison. 



|l-ir. 54J 



