AgricultureID

Comparison · crop

Root & tuber staples: potato vs cassava vs sweet potato vs yam

Compare the principal starchy root and tuber staples.

Root & tuber staples: potato vs cassava vs sweet potato vs yam
DimensionPotatoCassavaSweet PotatoYam
CategoryTuber cropRoot and tuber cropRoot and tuber cropRoot and tuber crop
Scientific nameSolanum tuberosumManihot esculentaIpomoea batatasDioscorea spp., principally Dioscorea rotundata, D. alata, and D. cayenensis
Botanical familySolanaceae (nightshades)Euphorbiaceae (spurge family)Convolvulaceae (morning glory family)Dioscoreaceae (yam family)
LifecycleGrown as an annual; propagated vegetatively from seed tubersPerennial shrub, commonly grown on an annual-to-biennial harvest cyclePerennial vine, commonly grown as an annual for root harvestPerennial climbing vine, cultivated in annual tuber-production cycles from seed tubers
Common diseasesLate BlightAnthracnoseRoot Rot, Common ScabAnthracnose, Root Rot
Common pestsColorado Potato Beetle, AphidsMealybugs, WhitefliesRoot-Knot Nematode, White GrubsRoot-Knot Nematode, Weevils
Suitable soilsLoam Soil, Sandy SoilSandy Soil, Laterite SoilSandy Soil, Loam SoilSandy Soil, Loam Soil

Methodology

Descriptive dimensions (family, lifecycle, associated diseases/pests, soils) are read from each crop’s reference entry. No crop is ranked as “better”; agronomic outcomes are region- and system-specific.

Limitations

  • Descriptive comparison only — not a yield, profitability, or suitability ranking.
  • Associated diseases/pests and soils are typical, not exhaustive, and vary by region.

Sources

This article draws on the following authoritative sources. See our sources & methodology for how they are selected.

  1. [1]FAO — Food and Agriculture Organization (opens in a new tab)

    Food and Agriculture Organization of the United Nations (FAO)

    Authoritative
    Type:
    Intergovernmental organization
    Jurisdiction:
    Global
    Accessed:
    2026-07-12
  2. [2]USDA PLANTS Database (opens in a new tab)

    USDA Natural Resources Conservation Service (NRCS)

    Authoritative
    Type:
    Reference database
    Jurisdiction:
    United States
    Accessed:
    2026-07-12