EXPERIMENTAL SPRAYING AT HIGH MOOR FARM. 83 



have been carried on by the writer and his associates. The 

 results of the season's work have been published each year in a 

 separate bulletin. Several of these annual reports of progress 

 are now out of print. The present publication is an attempt to 

 present a general summary or resume of the work done and 

 the more important results obtained. 



Object of the experiments: The primary object of these 

 experiments centers around the efficient and economical control 

 of apple scab with a minimum amount of injury to fruit and 

 foliage, as applied to Maine conditions. This involves the na- 

 ture of the spray used, as well as the time, number and manner 

 of the applications. 



Certain sprays, including bordeaux mixture, some of the pro- 

 prietary compounds and other spray mixtures used in the course 

 of the experiments, are very efficient in controlling scab, if ap- 

 plied at the proper time. This avails but little if, as has some- 

 times been the case, the action of the spray results in the re- 

 moval of from half to two-thirds of the foliage from the tree. 

 Also bordeaux mixture when used on the Ben Davis, although 

 it has given excellent scab control, has invariably rendered a 

 large part of the fruit, sometimes as high as 90 per cent, unsala- 

 ble on account of russeting. Bordeaux mixture on the other 

 hand can be used with perfect safety even on the peach in cer- 

 tain of the irrigated sections of the West where the summer 

 rainfall is slight.* Lime-sulphur has been used as a summer 

 spray without injury in the State of Washington much 

 stronger than could be employed with safety under local 

 conditions. t These facts and many others have shown that 

 it is not safe to generalize too much upon or adopt without 

 reserve results secured in other parts of the country under 

 different climatic conditions, and emphasize the necessity of 

 securing data based on Maine experience. Moreover, in spite 

 of recent progress, there are numerous unsolved problems of 

 both practical and scientific interest in connection with orchard 

 spraying. 



*It was the writer's good fortune to visit a peach orchard in Utah 

 in the summer of 1914 where some spraying experiments were being 

 carried on by Dr. Geo. R. Hill which amply demonstrated this fact. 



tMelander, A. L. and Beattie, R. K. The sulphur-lime wash. Pop. 

 Bui. 28. Wash. Agl. Exp. Sta. 



