Four areas were sampled: 3 abandoned orchards and the Univer- 



sity orchard. Except in 1 

 traps were set July 1, and 

 weekly between July 15 and 

 approximately once every 3 

 fol lows : 



abandoned orchard (Orchard Hill), the 

 examined for apple maggots and rotated 

 October 3, 1974. The traps were replaced 

 weeks. The four sampling areas were as 



Bel chertown . An abandoned orchard sampled with 10 traps (5 red 

 spheres and 5 yellow traps). 



University Orchard . The portion sampled in this orchard was under 

 a partial spray program. Six traps were used (3 red spheres and 

 3 yel 1 ow traps ) . 



Shel burne Fal 1 s . Five red spheres and 5 yellow traps were used in 

 this abandoned orchard. 



Orchard Hill . This abandoned orchard is located on the University 

 of Massachusetts campus. Three red spheres and 3 yellow traps were 

 used, and were checked once a day between August 6 and September 4, 

 1974. 



Data also were obtained from an abandoned block of Yellow Transpar- 

 ent apple trees in Northborough , Massachusetts by Joseph Costante, 

 Regional Fruit Specialist. Vial bait traps were used in Costante's 

 work. 



Resul ts . The yellow traps and red spheres appeared to be equally 

 effective in capturing apple maggots (Table 1), though nearly twice 

 as many apple maggots were caught on the red spheres at Orchard 

 Hill. The yellow traps were most effective in capturing females 

 while the red sphereswere better at attracting males (Table 1). 



Table 1. Number of adult apple maggots caught on yellow traps and 

 red spheres in 4 orchards in 1974. 



Sampl ing 

 area 



Yellow Traps 



Males Females Total 



Red Spheres 



Mai es Fema I es Total 



Univ. Orchard 1 



Belchertown 16 82 



Shelburne Falls 32 180 



Orchard Hill 7 98 



1 



98 



212 



105 







74 



142 



112 





 21 

 66 

 93 







95 



208 



205 



The yellow traps tended to attract a larger percentage of new- 

 ly emerged females (females with undeveloped ovaries) than did the 

 red spheres (Table 2). 



