1 



0.8 

 0.6 

 0.4 

 0.2 

 



1 



0.8 

 0.6 

 0.4 

 0.2 

 



BEN+GA 



■ baited 

 D unbaited 



pyramid 



cylinder 



LIM + GA 



Circle 



@ bailed 

 D unbailed 



pyramid 



pyramid 



cylinder 

 TRAP TYPE 



Circle 



1 

 0.8 

 0.6 

 0.4 

 0.2 







cylinder 



GA 



Circle 



@ baited 

 □ unbailed 



j: 



J I 



pyramid 



cylinder 

 TRAP TYPE 



Circle 



Figure 3. For each trap type, degree of correlation between phenology (time during the season) of PC 

 captures on perimeter-row traps and phenology of mjury to fruit on perimeter-row trees m plots havmg 

 that odor. The higher the R^ value, the greater the extent of the correlation. There were no statistically 

 significant positive correlations. 



same plots, or Circle traps baited with ethyl isovalerate 

 plus GA, limonene plus GA, or GA alone. For each 

 type of odor bait, pyramid and cylinder traps captured 

 numerically fewer PC's than Circle traps. 



Figure 2 shows, for each odor and trap type, the 

 degree of correlation between the total (season-long) 

 amount of PC captures and the percent sampled 

 perimeter-row fruit injured by PC's in plots having that 

 odor and trap type. A significant positive correlation 

 would indicate that orchards which showed 

 comparatively many captures for a given odor and trap 

 type also showed a comparatively large amount of PC 

 injury, whereas orchards which showed comparatively 

 few captures also showed a comparatively small 

 amount of PC injury. Among all odors and trap types. 

 Circle traps baited with benzaldehyde plus GA showed 

 the highest degree of positive correlation (0.75) 

 between trap captures and injury. What this means is 

 that after the PC season has ended, one can look back 

 and say with high confidence that the extent of PC 

 captures by Circle traps baited with benzaldehyde plus 

 GA reflected quite well the extent of PC injury that 

 occurred on trapped and other trees in the same plot. 



Figure 3 shows, for each odor and trap type, the 



degree of correlation between the phenology (time of 

 season) of PC captures and the phenology of PC injury 

 to perimeter-row fruit in plots having that odor and 

 trap type. A significant positive correlation would 

 indicate that a sampling period during which 

 comparatively many trap captures occurred also was a 

 sampling penod in which a comparatively large amount 

 of injury was initiated, whereas a sampling period 

 during which comparatively few (or no) trap captures 

 occurred was a sampling period in which comparatively 

 little (or no) fruit injury was initiated. Among all odor 

 and trap types, no trap showed a significant positive 

 correlation between phenology of captures and 

 phenology of injury. In fact, the highest degree of 

 positive correlation for any trap type was only 0.20, 

 and the correlation for Circle traps baited with 

 benzaldehyde plus GA was a mere 0.01. What this 

 means is that during the PC season, one could not have 

 any confidence whatsoever that the extent of PC 

 captures during any particular 3- to 4-day period 

 reflected the amount of PC injury that was initiated 

 during that period, even for the best-performing trap. 

 A deeper look into the phenology of captures by 

 Circle traps baited with benzaldehyde plus GA and the 



Fruit Notes, Volume 67, Winter, 2002 



19 



