Table 1. Average percent injury by early-season insect pests in second- 

 level and first-level IPM blocks in 1993.* 



* Means in each couplet in each column followed by a different letter 

 are significantly different at odds of 19:1. Two hundred fruit of each 

 cultivar present in both second-level and corresponding first level 

 blocks were sampled at harvest. All blocks contained at least 1 of 

 the following cultivars, and some contained up to 3 of these: 

 Mcintosh, Cortland, Delicious, Empire, Golden Delicious. Average 

 number of fruit sampled per block = 500. When sampling a cultivar, 

 we examined 10 fruit on each of 20 interior trees and 10 on each of 

 10 perimeter-row trees (when cultivar present on a perimeter row). 

 TPB = tarnished plant bug; PC = plum curculio; EAS = European 

 apple sawfiy; GFW = green fi-uitworm. 



Table 2. Dosage equivalents (spray events in parentheses) of insecticides and 

 acaricides used in second-level and first-level IPM blocks in 1993.* 



Type of block 



Full second-level 

 First-level 



Transitional second-level 

 First-level 



LH = leafhopper, ABLM = apple blotch leafminer. 



FruH Notes, Winter, 1994 



