0.5 



<D 



CO 

 CD 



0.4-- 



co 



§2 0.3 

 □ 



CU 



~ 0.2 

 o 



o 

 §-0.1 



0.0 



Aphid predators: Syrphus spp. 



IZZI Thiod 

 ^^3 Thiod 



an (full rate) 

 an (half 



Soap (full rate) 

 I / J Soap (half rate) 



rate) plus Soap (full rate) 



■g. 



a" 

 o 



a a a b 



n b ■ 



26 Jun 29 Jun 6 Ju 

 Mcintosh 



-o 



a 

 5" 



a a a b 



26 Jun 29 Jun 6 Ju 

 Red Delicious 



Figure 2. Proportion of leaves infested with syrphid larvae. Aphicides were applied on June 27. Means 

 within date and cultivar were not significantly different unless noted; where noted, means labelled by dif- 

 ferent letters are significantly different at odds of 19 to 1. 



26 Jun 29 Jun 6 Jul 



Mcintosh 



26 Jun 29 Jun 6 Jul 



Red Delicious 



Figure 3. Proportion of leaves infested with Aphidoletes aphidimyza. Aphicides were applied on June 27. 

 There were no differences among means for each date and cultivar. 



Fruit Notes, Spring, 1990 



23 



