24- 



Table 4. Cost benefit comparison of insect and mite results in 20 Previous 

 Year IPM, 21 First Year IPM and 7 Check commercial apple blocks 

 in Massachusetts, 1981. 



Parameter 



Orchard 



Previous 

 Year IPM 



First 

 Year IPM 



Check 



Difference (%) vs. check 



Previous 

 Year IPM 



First 

 Year IPM 



(Avg. no. sprays/A) 



Oil 



Insecticide 

 Aphicide 

 Miticide 



(Avg. no. of dosage 

 equivalents /A) 



Oil 



Insecticide 



Aphicide 



Miticide 



(Avg. cost /A spray 

 materials) 



Oil 



Insecticide 

 Aphicide 

 Miticide 



$26.16 

 $87.86 





 $11.74 



$20.93 

 $95.53 





 $19.11 



$28.78 

 $124.87 

 

 $28.59 



-$2.62 

 -$37.01 





 -$16.85 



-$7.85 

 -$29.34 

 

 -$9.48 



(Avg. application 

 cost/A)^ 



(Avg. % Insect injury) 



$35.37 

 2.5 



$33.30 

 3.7 



$44.33 

 2.0 



-$8.96 

 +25 



-$11.03 

 +85 



(Avg. value/A of fruit 

 loss due to insect injury)' 



(Avg. net benefit or loss 

 from IPM)" 



$126.46 $188.74 



$101.20 



+$25.26 

 +$40.18 



+$87.54 

 -$29.84 



Based on 15 mins time to spray one acre, $6.05/hr labor cost and $2.42/acre per spray 

 date for fuel and oil. 



^Based on average values as of Nov. 15: U.S. Fancy Fruit @ $12.50/bu, U.S. //I fruit 



(a $8.50/bu, cull fruit @ $3.30/bu and average yields of 550 bu/A. 



w. 



Does not Include cost of scouting, traps, travel or administration in IPM blocks 

 (estimated at $45.00 per acre per year). 



