100 



50 



□ % THAT FED 

 ■ % THAT DIED 



0.001 0.01 0.1 



B 



100 



SS 50 



D % THAT FED 

 ■ % THAT DIED 



0.001 0.01 0.1 



CONCENTRATION OF SPINOSAD 



Figure 5. Among flies (from Figure 4) placed on spheres topped by discs that contained 

 different concentrations of spinosad (0 to 1.0%) and received 10 inches of artificial rainfall 

 before testing (A) percentage of those which remained on spheres that fed and died within 72 

 hours, and (B) percentage of those which moved onto discs that fed and died within 72 hours. 



of artificial rainfall, 

 whereas results of 

 field trials 



(Experiments 1 and 2) 

 suggest that a dose of 

 spinosad higher than 

 0.1% may be needed 

 to withstand amounts 

 of natural rainfall that 

 exceed 10 inches. 

 It is encouraging to 

 know the University of 

 Massachusetts (the 

 financial supporter of 

 a pending patent for 

 this new type of PTS), 

 Dow Chemical 



Company 

 (manufacturer of 

 Entrust), the EPA 

 (which supervises 

 registration of new 

 products for orchard 

 used), and Pest 

 Management 

 Innovations 

 Incorporated 

 (manufacturer of discs 

 atop PTS) are jointly 

 enthusiastic about this 

 new technology of 

 incorporating spinosad 

 into sugar/paraffin 

 discs atop spheres for 

 managing AMP. 



A cknowledgments 



Thanks to Eliza Gray, 

 Mareanna Ricci, and 

 Guadalupe Trujillo for 



version) contains spinosad (Entrust) in the disc atop technical assistance in the field test. These studies were 



the sphere. Results of laboratory trials (Experiment 3) supported by grants from the USDA Pest Management 



suggest that the concentration of spinosad in the disc Alternatives Program and the USDA Crops at Risk 



needs to be at least 0.1% to be effecfive after 10 inches Program. 



^f^ «1^ «1# «£# %X0 



*Tr ^ *(ir *?• ^ 



Fruit Notes, Volume 69, Spring, 2004 



25 



