How do they do it: pitahaya or dragon fruit

In the trade we often come across pitahaya at this time of the year. We think of an elegant red fruit with green flaps on it. The pulp is white and contains numerous black seeds, there are also varieties with purple pulp.
However, there is confusion behind this. An actual pitahaya is yellow in color, with the fruit showing no flaps, only the roots thereof. The pulp of this fruit is transparent white and the black seeds are slightly larger.
The name of the red fruit is dragon fruit, but has been used less and less over the years. Both the yellow and the red fruits are often traded under the name: Pitahaya. Both are cactus fruits and belong to the family Cactaceae, but they are two different species. The red dragon fruit (Hylocereus) is mainly grown in Central America and Asia. The yellow pitahaya (Selenicereus) is native to South America, but it is also grown in Israel.
When inspecting dragon fruit, the most important things are the freshness of the leaves and gray sunken spots on the skin, which can develop into slipskin.