27 



response to pesticide board regulations governing its use. 



In one block with a long history of SJS problems, Diazinon*pro- 

 vided excellent SJS control in combination with an aggressive oil 

 program, pruning to enhance spray penetration, and frequent grower 

 scouting. This program resulted in 01 SJS injury in 1982 compared 

 to 91 such injury in the block in 1980. 



European apple sawfly (EAS) injury was substantially higher in 

 all blocks checked in 1982 than in previous years (Table 2). This 

 finding, also observed by IPM personnel in Vermont, may have been 

 due largely to higher EAS populations in several blocks (cumulative 

 average of 43 EAS per trap in one case, 27 per trap in another, for 

 example) . 



This apparently higher than normal EAS injury may also be re- 

 lated to our continued efforts to distinguish between TPB "dimples" 

 and EAS "stings" which are similar in appearance. Inasmuch as most 

 EAS injury in 1982 consisted of "stings" rather than well developed 

 larval burrows, most EAS injury was not of economic significance. 



Tarnished plant bug injury was somewhat lower in 1982 than in 

 recent years. As we have noted previously and as researchers in 

 New York State have recently confirmed, the majority of TPB injury 

 consists of "dimples" in the fruit calyx which will not adversely 

 affect fruit grade. 



In 1982, based on use of white TPB traps, 21% of IPM blocks 

 were able to withhold pre-bloom TPB sprays while sustaining 1.1% 

 injury from this pest, compared to 0.83% injury in the sprayed 

 checks . 



Plum curculio (PC) injury was lower on average in all blocks in 

 1982, accounting for 0.43, 0.37 and 0.26% average injury in Previous- 

 year IPM, First-year IPM and checks, respectively (Table 2). 



Much of the observed PC injury occurred in late June with an 

 unexpected burst of PC activity and most injury was confined to 

 block peripheries. Several blocks achieved good PC control using 

 border sprays subsequent to an initial block-wide PC treatment ap- 

 plied in response to first observation of this pest's activity in 

 commercial blocks. 



Combined injury from Gypsy moth, Apple maggot fly (AMP), Leaf- 

 rollers (LR) , Codling moth (CM), White apple leafhopper (WAL) and 

 Green fruitworms (GFW) was low in 1982, accounting for a total of 

 0.04, 0.12, and 0.09% injury in Previous -year IPM, First-year IPM 

 and check blocks, respectively. 



Private scout/consultants (New England Fruit Consultants) 

 report a possible case of resistance in Green Fruitworm to organo- 

 phosphate insecticides. Such resistance in GFW has been noted in 

 the Hudson Valley of New York and points out the need for continued 

 monitoring of pests which are presently of minor significance in 

 New England. 



Trade name 



