-16- 



codling moth, redbanded leafroller and oblique-banded leaf- 

 roller. Visual inspections of fruit and foliage in all por- 

 tions of the tree canopy were used to monitor populations 

 of plum curculio, spotted tentiform leafminer, green apple 

 aphids, and aphid predators. 



Sampling was only tri-weekly, due to gasoline scarcity. 

 An on-tree survey of 1200 fruit per treatment block was per- 

 formed at harvest to determine injury levels to fruit. 



Insect Injury to Fruit At Harvest 



Total insect injury at harvest averaged 2.84% in alter- 

 nate-middle blocks vs. 3.61% in every-middle blocks (Table 1) 

 below. 



Table 1. Average percent of insect and disease injury to fruit 

 in 4 alternate-middle vs. every-middle commercial orchard 

 blocks in Massachusetts, 1979. 



Insect 



Every-middle Alternate-middle 



Total 



3.61 



2.48 

 0.12 

 0.04 

 0.02 

 0.02 

 0.02 

 0.00 

 0.14 



2.84 



Disease 



Every-middle Alternate-middle 



Scab 

 Rots 

 Rusts 



Total 



Total injury from insects 

 and disease 



0.24 

 0.14 

 0. 00 



0.38 

 3.99 



.06 

 .11 

 .06 



.23 



3.07 



In 1979, the most serious pest in both types of blocks 

 was tarnished plant bug, which accounted for 2.48% injury in 

 alternate-middle blocks vs. 3.07% in every-middle blocks. 



