The cassava breeding materials from the International Institute of Tropical Agriculture (IITA) were evaluated for resistance to cassava green mite (CGM) at the Chambesi and Kizimbani Stations, Tanzania, where CGM population was high. At Chambesi Station, 58 clones (15%) of the 377 clones tested under natural infestation were rated resistant (classes 1 and 2) to CGM. In Zanzibar the CGM-resistant clones, which were high yielding, resistant to cassava mosaic disease (CMD) and acceptable in consumer quality, are being multiplied for distribution to farmers.