required for STLM and SJS control, however, it is possible that 

 this trend may be reserved in the future years. 



19 



Cost and benefit comparisons 



Table 4 summarizes our cost benefit analysis of IPM vs. Check 

 blocks. IPM orchards realized substantial savings in spray mat- 

 erials and application costs per acre compared to Checks. (Table 

 4). (All calculations were done using suggested retail prices, 

 with no attempt made to account for grower liulk rate discounts, 

 which vary considerably). 



Table 4. Cost benefit analysis of insect and mite results in 18 

 IPM and 9 Check commercial apple blocks in Massacliusetts , 1980 



Parameter 



Orchard 



IPM 



Check 



(Avg. no. sprays/A ) 



Oil 



Insecticides 

 Aphicides 

 Mit icides 



( Avg. no. of dosage 

 equivalents for)^ 



Difference IPM 

 vs . Check 



1 

 6 

 

 1 



Oil 



Insecticides 

 Aphicides 

 Miticides 



3. 7 7 



$26.45 



$18. 53 



55.54 



1.50 



20.30 



1.0 

 8.8 



0.5 

 2.0 



4.09 



$34. 27 



$21 



98 



5 



39 



37 

 04 

 89 



79 



(Numerical) 



0.32 



$ -7.82 



$ 



-2.84 

 -42.50 



-4.30 

 -19.49 



(%) 



( Avg. value/A of 

 fruit loss due 

 to insect injury )w $200.96 $217.38 



( Avg. net benefit/A from IPM 



$-16.42 

 $+93.37 



' - , ^ Actual pesticide rate/100 gal 



Dosage equivalent = Recommended rate in Southern 



New England Apple Spray Cuide 



r 



Does not include injury from sooty mold, white apple leafhopper 

 and woolly apple aphids which could be removed by washing fruit. 



Based on 15 min. time to spray 1 acre, $5.50/hr. labor cost and 

 $2 . 20/acre/application for fuel and oil. 



Based on average values as of October 10: US Fancy Fruit $11.33/bu, 



US n fruit $7.00/bu., cull fruit $1.60/bu. and average yields 



of 550 bu./acre. 



w 



