Efficacy trials are key to keeping growers informed about which chemicals currently work and which don’t for Bemisia whitefly. Entomologists at the University of Maryland and Delaware recently did such a study, and included newer pesticide registrations.
A typical poinsettia crop in Ontario can battle both B (Middle-East-Asia species) and Q-type (Mediterrannean species) Bemisia.
Done on poinsettia with the less-resistant (but still challenging) Bemisia “B” type (aka the Middle East-Asia species), Dr. Stanton Gill and his team tested a plethora of chemicals. These were applied according to company-recommended rates and application dates.
You can find the full summary of their final sampling date in October here.