affixed on a nearby twig. Under this plan, there would be 

 no sticky and there would be minimal handling of the 

 spheres. We are trying to obtain grant funds to pursue this 

 idea. 



Bonier Row Sprees Without Predator Releases 



As in 1987, test blocks in 1988 received a spray of 



Guthion™ or Imidan™ applied only to perimeter apple 

 trees every 3 weeks from mid-June through August. The 

 interior of the block remained free of insecticide or miti- 

 cide during this time. 



As shown m Table 2, in both 1987 and 1988, there was 

 little fruit mjury caused by apple maggots, codling moths, 

 summer leafrollers, or other insects active after mid-June 

 in either border-row-sprayed blocks or the fully-sprayed 



Table 2. Effects of applying border row sprays without mite predator releases in apple 

 orchard blocks. 



Avg. % leaves (or terminals) infested/block'''* 



Ratio of 

 pest to 

 ERM predatory 



TSM AF YM mites WAA WAL PL LM GAA GAAP 



1987 Brd-row- 



sprayed 6 24 1.2 0.1 19:1 

 Fully- 

 sprayed 6 16 0.3 48:1 



1988 Brd-row- 



sprayed 5* 12 0.1 0.1 61:1 

 Fully- 

 sprayed 5 9 0.5 0.1 16:1 



^500 on-tree fruit/block sampled during July, August, and September. 



''AMF = apple maggot fly, CM = codling moth, RBLR = redbanded leaf roller, ERM 



= European red mites, TSM = two spotted mites, AF = Amblyseius fallacis, YM = 



predatory yellow mites, WAA = woolly apple aphid, WAL= white apple leafhopper, 



PL= potato leafhopper, LM= leafminer, GAA= green apple aphid, GAAP= green 



apple aphid predators: cecidomyiids and syrphids. 



"400 leaves (or terminals) sampled/block during July, August, and September. 



"Owing to a mistake on our part, data on foliar pests in one orchard had to be omitted. 



