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this response has not been consistently accompanied by greater 

 fruit set the year following treatment. The only instance where 

 fruit set was increased was with the most potent chemical treat- 

 ment in 1974, The study was continued in 1975 and by July of 1976, 

 more data will be available, but to date, results on fruiting have 

 not been encouraging. 



Frequently, there are blocks of young, non-bearing Delicious 

 trees that are growing too vigorously as a result of excessive 

 pruning and/or fertility and occasionally bearing trees will be de- 

 fruited by frost. In these instances, a restriction of tree growth 

 would be beneficial on both the older and younger trees, whether 

 or not it is accompanied by increased bloom and/or fruit set on the 

 young trees. To restrict growth, we suggest the following combin- 

 ation sprays of ethephon and Alar-85*. 



Non-Spur trees : Apply ethephon at 900 ppm (3 pt/100 gal) plus Alar- 

 85* at 1000 ppm (1 lb/100 gal) 10-14 days after full bloom. 



Spur trees : Spur trees are more sensitive to growth retardant 

 sprays than are non-spur trees. Therefore, on spur-type trees, 

 apply ethephon at 600 ppm (2 pt/100 gal) plus Alar-85* at 1000 ppm 

 (1 lb/100 gal) 10-14 days after full bloom. 



Treatments other than limb spreading should not be applied to 

 trees until they are large enough to bear a crop. 



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REDUCED SPRAYING FOR APPLE INSECTS AND MITES: 

 RESULTS FROM NEW YORK 



Ronald J. Prokopy 

 Department of Entomology 



In the preceding 2 issues of Fruit Notes , I discussed results 

 of reduced spray programs for apple insects and mites obtained in 

 British Columbia, Michigan, and North Carolina. Here, I will dis- 

 cuss the results of an apple pest management pilot project carried 

 out in commercial orchards in western New York from 1973 to 1975. 

 Most of the project was conducted in a 5 square mile area of Wayne 

 County, and involved 16 growers. The results, not yet published, 

 have been compiled and summarized by 4 members of the New York 

 State Agricultural Experiment Station at Ithaca and Geneva: Drs. 

 J. P. Tette (Manager of Project Field Operations), E.H. Glass (Proj 

 ect Leader), J.L. Brann (Extension Entomologist), and P. A. Arneson 

 (Extension Plant Pathologist). 



*Trade name 



