In our second experiment, conducted in the 

 same orchard, we wanted to gain more direct 

 information on the extent of curculio flight into 

 tree canopies on warm versus cool days. 

 Therefore, on the remaining 12 trees in the 

 orchard (every third tree not involved in the 

 first experiment), we positioned two squares of 

 clear Plexiglass (2 feet by 2 feet) vertically on a 

 pole about 2 feet to the outside of the perimeter 

 foliage of each tree: one square at base height of 

 foliage and one square at top height of foliage. 

 The entire surface of each square facing away 

 from the canopy (but not the surface facing 

 toward the canopy) was coated with Tangletrap 

 to capture curculios flying toward the canopy. 

 Traps were emplaced on the same dates and 

 examined for captured curculios at the same 

 time (daily at 8 PM) as in the first experiment. 



Results (Table 1, experiment 2) show that 

 there was no significant difi'erence in numbers 

 of captured curculios between the low- 

 positioned and the high-positioned traps. 

 Results (Table 1, experiment 2) also show there 

 was a significant positive correlation between 



daily numbers captured at each position and 

 daily high temperature. Furthermore, there 

 were significant positive correlations between 

 daily captures on high or low traps and daily 

 numbers of curculios tapped from canopies of 

 trees with or without a Tangletrap band (data 

 not shown). 



Together, these findings constitute strong 

 evidence that on warm days, curculios fly 

 directly into tree canopies, whereas on cool days 

 there is much less tendency to do so. 



Movement Toward Pyramid Traps. In 

 our first experiment, we placed an unbaited 

 pyramid trap midway between the trunk and 

 canopy edge of each of the 12 trees that received 

 sticky-coated squares of Plexiglas at the 

 Hardigg orchard. Every other pyramid trap 

 received a band of Tangletrap 4 inches above 

 the base to prevent curculios from crawling to 

 the top. The remaining six traps did not receive 

 Tangletrap. All traps were in place fi"om May 

 25 to June 7 and were examined daily at 8 PM 

 for captured curculios. 



Results (Table 1, experiment 3) show that 



Fruit Notes, Volume 62 (Number 1), Winter, 1997 



