Researchers in New York explored on-farm management practices that might improve diamondback moth control. The relative resistance of the moth population makes a difference when deciding which type of Bt to use. They found that Javelin (a 6.4% a.i. formulation of B. t. var. kurstaki) was significantly more effective than XenTari (3.2% B. t. var. aizawai) against susceptible populations, but XenTari was more effective for controlling resistant populations.
Improved application technology also enhanced control; an electrostatic sprayer doubled the efficacy of XenTari compared with traditional spray applications, so a lower dose could be used.
Perez, C. J., A. M. Shelton, and R. C. Derksen. 1995. Effect of application technology and Bacillus
thuringiensis subspecies on management of B. thuringiensis subsp. kurstaki-resistant diamondback moth
(Lepidoptera: Plutellidae). J. Econ. Entomol. 88(5): 1113-1119.