Table 6. Foliar insect pest average population levels in second-level and first-level blocks in 

 1993.* 



Means in each couplet in each column followed by a different letter are significantly different 

 at odds of 19:1. PLH = potato leafhopper, WALH = white apple leafhopper; RLH = rose 

 leafhopper, ABLM = apple blotch leafminer; GAA = green apple aphid; GAAP = green apple 

 aphid predators: cecidomyiids and syrphids, WAA = woolly apple aphid. PLH, WALH, and 

 RLH data are average percentages based on bi-weekly samples of 100 or 200 fruit cluster or 

 terminal leaves. ABLM data are the average number of mines per 100 leaves based on bi- 

 weekly samples of 100 or 200 fruit cluster or terminal leaves. GAA, GAAP, and WAA data 

 are percentage watersprouts infested based on bi-weekly samples of 200 watersprouts. 



Fruit Notes, Winter, 1994 



