- 9 - 



with every spray application, it would save 501 o£ the spray costs. 

 Richard Moore has done extensive research on this approach in 

 southern Connecticut, with very encouraging results. However, the 

 complex and the density of apple pests in southern Connecticut is 

 not the same as in Massachusetts. Hence, we needed to evaluate 

 this approach under our own conditions. 



ed alternate with every middle row spray 



block in each o£ 3 commercial apple orchards 

 d eastern Massachusetts. Each block was 

 one receiving the alternate row program on 

 ink through last cover; the other receiving 



Each grower used an air blast sprayer at 

 ormal spray schedule, and used his own 

 s. All trees were full grown -- some on M-7 

 tandard. The centers of the trees were 

 1 blocks. 



trea 



in w 



divi 



each 



the 



4X. 



sele 



root 



fair 



In 19 

 tments 

 estern 

 ded in 



spray 

 every 



He fo 

 ction 

 stock; 

 ly wel 



76 we 

 in a 

 , cent 

 to 2 p 



date 

 row pr 

 llowed 

 of pes 

 other 

 1 open 



compar 

 4-acre 

 ral an 

 lots 

 from p 

 ogram 



his n 

 ticide 

 s on s 



in al 



To determine the extent 

 in each plot for monitoring c 

 flies (see Fruit Notes 41(1): 

 construction) . Vie caught the 

 trapping week for all orchard 

 codling moth = 6.0, apple mag 

 moth = 6.5, apple maggot = 1. 

 found that when codling moth 

 apple maggot abundance 1/trap 

 pests is very likely to occur 

 potentially damaging numbers 

 the alternate and every row p 

 of fruit injury caused by the 

 abundance of mites and aphids 

 60 leaves/tree on each of 6 t 

 3 weeks from May until harves 



of insect p 

 odling moth 

 4 and 4 1(6) 



following 

 s combined: 

 got = 1.9; 

 8. Researc 

 abundance e 

 /week, then 



unless spr 

 of both the 

 lots. To d 

 se and othe 



on leaves, 

 rees in eac 

 t. 



est pressure, we 



adults and appl 



:7 for informati 



average numbers/ 



alternate row 

 every row plot - 

 hers in other st 

 xceeds 2/trap/we 

 fruit injury fr 

 ay is applied, 

 se pests existed 

 etermine the act 

 r pests as well 

 we examined 60 

 h plot in each b 



hung traps 

 e maggot 

 on on trap 

 trap/ 

 plot -- 

 - codling 

 ates have 

 ek and 

 om these 

 Thus, 



in both 

 ual degree 

 as the 

 fruit and 

 lock every 



The resul 

 of the fruit i 

 pared with 2.8 

 fruit in each 

 each plot by a 

 caused 0.2-0.4 

 most injury: 

 70% more abund 

 areas. No app 

 examined, but 



ts (in the 

 n the ever 

 % in the a 

 plot was i 

 pple maggo 

 % injury i 

 2.0 -- 2.1 

 ant in the 

 le scab wa 

 some may h 



Table below) show that an average of 2.71 

 y row plots was injured by insects com- 

 Iternate row plots. None of the sampled 

 njured by codling moth, and only 0.1% in 

 t. Plum curculio and European apple sawfly 

 n each plot whereas plant bugs caused the 

 %. Aphids and mites, however, were 60 to 



alternate row plots than in the every row 

 s observed on any of the leaves or fruits 

 ave escaped our notice. 



fruit infested 



I leaves 

 infested 



Treatment 



Codling j'^ple Plum Apple Pl-m.i: 

 Moth Maggot Curculio Sawfly Bugs Other Total Aphids Mites 



Alternate row 0.1 0.2 0.4 2.1 2.8 2.2 19.1 



Every row 







0.1 



0.3 



0.3 2.0 







2.7 1.4 



11.3 



