author(s)
Moffat K Njoroge, DC Kilalo, DW Miano and DL Mutisya

abstract
A survey was carried in most agro-ecological zones of Kenya to determine most common whitefly species found on cassava in the coastal, western and eastern parts of the country. The two common species were Bemisia tabaci (Gennadius) and Trialeurodes vaporariorum Westwood, found on cassava in all agro-ecological zones of coastal lowlands (CL 3-5), low midlands (LM 1-5) and upper midlands (UM 2, 3). Bemisia tabaci was highest in the low midlands (LM 1-5) followed by upper midland regions (UM 1-4). On the other hand T. vaporariorum was highest in CL 3. The agro-ecological zone with the least T. vaporariorum was the UM 2 and UM 3. Altitude above sea level had no effect to abundance of whiteflies on cassava. Higher whitefly density on cassava did not result to higher cassava virus disease incidence. Altitude level in the different agro-ecological zones did not correlate to disease incidence.