regulators, field management Ulluco is grown in the highlands and can survive in altitudes of up to above sea level. Indigenous Andean farmers regularly grow a large number of different cultivars of ulluco together in the same fields. Ulluco crop is alternated with two other Andean tuber crops known as oca and mashua. These different tubers are planted together in relatively small field and harvested after approximately eight months. The different species are then separated following harvest. Harvest and postharvest treatment Ulluco tubers need to be dug by hand due to their sensitivity to scarring. Due to the importance of their appearance, scuffing of their skin is likely a problem. Under traditional cultivation conditions, yield range from five to nine tons per hectare however in intensive systems, they have been known to reach 40 tons per hectares. These tubers can be stored year-round in the Andes but are best stored in the dark as exposure to the sun can cause fading of their vibrant colouring. Usually a proportion of the smaller tubers from the harvest are preserved for use as seed tubers the following year. The remainder of the harvest is most often used for consumption however there has been an increasing trend for ulluco use as a cash crop at the markets. Diseases, viruses, pests The ulluco is popular among Andean farmers for not having pest and disease issues. However, it has the potential to be host to viruses such as Tymovirus. Tymovirus is similar to the Andean potato latent virus. This could threaten potato crops, as well as other crops in the family Solanaceae (tomatoes, aubergines, peppers). Other species in the family Amaranthaceae (spinach, beet, quinoa) may also be at risk. These viruses pose no risk to human or animal health. The ulluco can be legally imported to the EU with a phytosanitary certificate, but caution is advised. Other viruses of ulluco include the Arracacha virus A, Papaya mosaic virus, Potato leaf roll virus, Potato virus T, Ulluco mild mosaic virus, Ulluco mosaic virus, and Ulluco virus C. Most heirloom ulluco have diseases, but if cultivated from a seed these can be avoided. Ullucus cultivated from clean seed tubers can increase yield by 30-50%. There are clones being developed to eliminate viruses, and these also have been shown to raise yields by 30-50%. The ulluco is susceptible to Verticillium wilt, a soil organism, at low altitudes and high