Efficacy of two predatory mite species to control whiteflies infesting poinsettia plants compared to the standard parasitoid Encarsia formosa
The two predatory phytoseiid mite species Amblydromalus limonicus (Garman and McGregor) and Transeius montdorensis (Schicha) were tested as alternative for the control of the two whitefly species Trialeurodes vaporariorum (Westwood) and Bemisia tabaci (Gennadius). As standards the parasitoid wasp E. formosa was included as well as a chemical routine treatment. Efficacy of all beneficials to control T. vaporariorum was comparable to the chemical regime, and all treatments provided good pest control without significant differences. Shortly after release, individuals of both predatory mite species were found on nearly each plant but numbers decreased after three to four weeks. Hence, releases had to be repeated regularly. Control of B. tabaci was slightly less efficient. Efficacy of E. formosa and T. montdorensis was similar followed by A. limonicus with 20, 26 and 56 B. tabaci larvae remaining per plant, respectively. Although numbers of beneficials had been increased for control of B. tabaci numbers were still not high enough. However, results indicate that successful control is possible.
Richter, E. 2017. Efficacy of two predatory mite species to control whiteflies infesting poinsettia plants compared to the standard parasitoid Encarsia formosa. Acta Hort. (ISHS) 1164:413-418
Amblydromalus limonicus, Bemisia tabaci, biological control, Transeius montdorensis, Trialeurodes vaporariorum