The Triple S (Storage in Sand and Sprouting) method of sweetpotato planting material conservation has been validated in unimodal and bimodal rainfall areas in Ethiopia. In addition to ensuring a supply of planting material at the start of the rains, Triple S significantly reduces incidence of sweetpotato weevil compared to traditional practices of conserving planting material in dry areas. Participatory testing ensures that farmers develop calendars to best fit the Triple S steps for areas with 3-5 month, 6 month and 9 month dry periods.