All rootstocks commercialised by Westfalia undergo repeated testing in various geographic areas before being released.
Short term—tree health, precocious yield
Long term— less use of chemicals for Phytophthora control, improved yield.
Hass on Dusa® (left) vs Hass on Duke 7 (right) (the previous standard rootstock in the South African avocado industry). Trees were four years old and had not received any Phytophthora treatments yet.
What does Dusa mean?
Dusa is a first name from Eastern Europe and means 'spirit' or 'soul'.
Latas is another excellent Westfalia rootstock, and is Hungarian for 'vision'.
Both cultivars were named by Joe Darvas, Westfalia's previous pathologist.
From research trials and commercial plantings of avocados on clonal Dusa® rootstocks, both in California and in South Africa, the following characteristics have been established:
Figure 1. Yield comparison of ‘Hass’ grown on Dusa®/Merensky 2, in different geographic areas (showing planting date), vs other commercially available South African rootstocks such as Duke 7 and Latas®/Merensky 1. Figures above bars indicate yield advantage based on cumulative yield.