Number of Insect Traps Used by Very Small Growers 



Number of Insect Traps Used by Small Growers 



Number of Insect Traps Used by Medium Growers 



Number of Insect Traps Used by Large Growers 



Figure 1. The percentage of each size category of orchard that monitored 0, 1 to 2, 3 to 5, or 6 to 

 9 insect pests with traps, as reported in the 1995 Tree-fruit Survey. Very small = 0-5 acres, small 

 = 5.1-20 acres, medium = 20.1 to 50 acres, and large = 50.1+ acres. 



from large farms said they select pesticides to con- 

 serve beneficials, compared to 79% of medium farms, 

 63% of small farms, and 58% of very small farms. A 

 similar result can be seen for direct observation of 

 pests and beneficials (86%, 82%, 73%, and 60%, re- 

 spectively), use of insect-monitoring traps (82%, 

 75%, 60%, and 50%, respectively), sprayer calibra- 

 tion (82%,71%, 65%, and 32%, respectively), cultural 

 controls (71%, 75%, 50%, and 40%, respectively), use 

 of thresholds (70%, 68%, 65%, and 36%, respectively). 



Differences according to farm size are particularly 

 striking for keeping scouting records (61%, 64%, 

 33%, and 15%, respectively), and use of disease- 

 monitoring devices (54%, 43%, 15%, and 7%, respec- 

 tively). 



Use of Traps for Insect Monitoring 



Across all farms, it comes as no surprise that 

 the most common insect trap used is the red sphere 



Fruit Notes, Summer, 1996 



15 



