EXPERIMENT STATION REPORT. 591 



left to themselves until the end of the season. The fearful in- 

 crease in September completely re-coated the trees and left them 

 in as bad a condition as they had been before. 



Experiment 4 — Sodium sulphite i pound, water 5 gallons ; a 

 simple solution; applied on tree 9, Reeves Favorite, June i8th. 

 The application was thorough, to test effect on foliage, etc. The 

 tree had a few smaller twigs and branches dead, was very scaly, 

 without active larvae, but plenty of young beneath the parent 

 scales, ready to move. When dry the tree" presented a washed 

 appearance, but no discoloration. Next day there was no trace 

 of injury to the foliage and, on June 20th, no adverse appear- 

 ance having developed, trees 13, 14, 15 and 16, of the same 

 variety and in the same general condition as 9, were carefully 

 covered with the same solution. At that time the scale on tree 

 9 seemed to be as little affected as the tree itself. July 3rd, when 

 all the trees were examined, no effect was noticeable on foliage or 

 scales ; the soda was harmless to both. No better results developed 

 on future examinations and the trees became rapidly worse — in 

 no respects different from those entirely untreated. 



The second set of applications was made July ist to 4th, in- 

 clusive, under the following directions : 



Experiment 7 — Use the concentrated solution ("Con-Sol") i 

 to 50, on one row or block, including all the varieties* in the 

 orchard, even if it is necessary to spray an isolated tree in a row 

 separated from the others. It is estimated that 45 to 50 trees 

 can be sprayed with that amount of solution. 



Experiment 8 — Potassium sulphide, i pound: lime, 2 pounds; 

 water, 5 gallons. Prepare as before and make up 50 gallons ; esti- 

 mated to spray about 50 trees. 



Experiment 9 — Sodium sulphite, i pound; lime, 2 pounds; 

 water, 5 gallons. Prepare as before and make up enough to spray 

 50 trees. 



Experiment 10 — Make up the lime, soda and sulphur mix- 

 ture, according to formula on page 14 of Bulletin No. 169; but 

 double the amount of water. Try this experimentally to see 

 whether it injures foliage. If no harm is done after 48 hours, 

 spray 50 trees. If injury is apparent, abandon the wash. 



Assuming that the last named mixture cannot be used and that 

 the trees yet unsprayed are badly covered with crawling larvae, 

 spray with the mixture referred to in. either Experiment 8 or 9; 

 whichever appears to have been most effective. 



Experiment ii — Test the two Dreer mixtures. One part to 

 25, by weight : i. e., i ounce by weight of the material in 25 



