Table 1. Control of first generation elm leaf beetle larvae with M-0neR (Bacillus thuringiensis var. San Diego) In two field trials, 1988. (Evaluation made 6 days after application.)
Rate formulation’ 100 gal sprayLarvae in pre-count (6/14)1Larvae In postcount (6/20)% control2
Site 1, Arvada, CO
3.0 qts136456146.3%
4.0 qts7193194.4%
8.0 qts10559488.3%
Untreated check853685
Site 2, Wheat Ridge, CO
3.0 qts104830.0%
4.0 qts825996.1%
8.0 qts1 229094.8%
Untreated check155124
  • 1 Larvae counted on 6 terminals per tree in pre- and post-counts in Arvada trial; 10 total terminals in Wheat Ridge trial.

  • 2 Mortality adjusted by Abbott’s formula (1925).