2002 



2003 



Apr May May May May May May May May May May May Jun 

 22- 1-4 5-6 7-8 9-12 13- 17- 22- 24- 26- 28- 30- 1-3 

 30 16 21 23 25 27 29 31 



2004 



Apr May May May May May May May May May May Jun Jun Jun 

 26- 1-3 4-6 7-9 10- 13- 16- 19- 22- 25- 29- 1-3 4-5 6-8 

 30 12 15 18 21 24 28 31 



Figure 3. For each of the five trapping years, proportions of PC females captured by traps that were either sexually 

 mature or mated, according to date. For each year, a box with diagonal lines indicates the petal-fall period. 



L 



of insecticide (commonly applied by the time of petal 

 fall) be delayed either (1) by one week if the pre-petal- 

 fall period is characterized by high temperatures (as in 

 our 2002 season), or (2) by 10-14 days if cool, rainy 

 weather prevails during the pre-petal-fall period. By 

 doing this, a grower can maximize PC control as a 

 higher proportion of immigrants may be killed, while 

 costs and exposure to insecticide would be minimized 

 given the fewer applications that might be needed. This 



is analogous to the temperature model developed at 

 Cornell University by Reissig et al. (1998) to control 

 PC, which involves use of cumulative heat unit models 

 to predict, in particular, termination of PC oviposition 

 activity. 



Acknowledgments 



We are grateful to Paul Appleton, Katie Bednaz, 



Fruit Notes, Volume 69, Fall, 2004 



