MR. WILLED A. laUI^bUW 

 DIRECTOR u'^^^X 



SOUTH CfQLLicjS^ ^\^--aO 43 



Ijftrch 27, 1944 



Prepared by the Fruit Program Coi.mittee 

 of the Extension Service 



\J, II f Thies, Extension Horticulturist 



Con tents 



Cause of Injury from Oil Sprays 



Peach Crop Prospects for 1944 



Can 17e Thin the 1944 Apple Crop? 



Do You Know? 



Orchard Soil Tillage in New England 



Gumming of Poach Trees 



Spring Control of Peach Tree Borers 



Planting Cultivated Blueberries 



Little Known Facts about Apple Scab 



CAUSE OF IIIJURY FRO M OIL SPRAYS 



Oils cause injury by smothering or excluding the supply of oxygen and 

 possibly by breaking da;irn the cell contents. On the bark of dormant trees 

 injury is apparently due to the penetration of the oil through the outer 

 bark to the caMbiuir.. Under favorable conditions the reoomi;iended Eimount of 

 oil in a spray will evaoorute or dry before it penetrates to the living 

 cells. Howe-ver, if mere than a safe amount is applied^ or the rate of 

 evaporation is decreased by cold, or by high humidity, the oil may have 

 time to penetrate the oaiabium before it dries. 



Issued by the Extension Service in furtherance of Acts of Hay 8 £ind June SO, 

 1914, Y/illard A. I.Iunson, Director, Massachusetts State College, United States 

 Department of Agriculture, and County Extension Services cooperating. 



