11 



black swellings or cankers on the branches. The principal control 

 for this disease is to prune off and burn these knots. Remove 

 small brandies entirely. On larger branches, cut to an outward 

 growing lateral. In any case, the cut should be made at least 

 six inches below any evidence of the disease and all diseased wood 

 should be removed from the orchard. This may necessitate more 

 drastic pruning than would be recommended ordinarily. 



*********** 



A VISUAL MONITORING TRAP FOR THE APPLE BLOTCH LEAFMINER"^ 



2 3 4 



Thomas Green , William Coli , Geoffrey Hubbell , 



and Ronald Prokopy 

 Department of Entomology 



For the past 3 years, we have attempted to develop a visual 

 monitoring trap for the apple blotch leafminer, Phyllonorycter 

 crataegella . This insect, an organophosphate-resistant pest of 

 apple foliage, is implicated in premature leaf and fruit drop 

 and reduction in fruit set the following season. A pheromone 

 trap is available for a related species, P. blancardella (spotted 

 tentiform leafminer) , but this pheromone is not effective in 

 attracting P. crataegella , the predominant species in Massa- 

 chusetts commercial orchards . We theorized that if a visual moni- 

 toring trap were available for P. crataegella, the need for a 

 pre-bloom insecticide application against the overwintering gener- 

 ation adults might be determined from trap capture levels. Here, 

 we present a brief summary of our research on the development and 

 utility of a visual trap for P. crataegella . 



Results 



In 6 experiments , we determined the number of P. crataegella 

 captured on sticky-coated (=Tangle-Trap^) traps painted with 

 commercially available paints of various colors. The consistently 

 highest captures in these experiments were on traps painted with 

 Sherwin-Williams Tartar Red DarkR Enamel. Results of 2 of the 

 experiments are presented in Table 1. 



1 

 We wish to express our appreciation to the following IPM field 

 scouts for assistance with data collection: David Gordon, Kath- 

 leen Leahv, Joseph Parella, Douglas Roberts, and Roy Zahnleuter 



2 

 Extension Technician 



3 

 Extension Pest Management Specialist 



4 

 Research Assistant 



5 

 Extension Entomologist 



