Tubers

Yam

INTRODUCTION White yam or Water yam or Greater yam is native to Southeast Asia and West Africa contributes 90% of yam production in the world. Elsewhere in Africa, the...

Cassava

INTRODUCTION Cassava typically grows as a shrub and a native of Latin America. It was introduced to Africa by Portuguese traders in the late 16th century. It is grown on...

Carrots

INTRODUCTION The wild ancestors of the carrot are likely to have come from Iran and Afghanistan, which remains the centre of diversity of D. carota, the wild carrot....

Potatoes

INTRODUCTION Potato is locally referred as Walu (Kikuyu), Kiazi (swahili), Egiasi, Mbatata and Enkwashei. Potato originated in the highlands of South America, where it...

Sweet Potato

INTRODUCTION Sweet Potato locally known as Viazi vya tamu (Swahili); Makwasi (Kikamba); Mapwoni (Luyia); Ngwaci (Kikuyu) are perennial vines, with one main season whose...