Farmers field lab tested heritage varieties of potato and found that all varieties, including newer breeds, performed well for yield and blight resistance.
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A taste test also found that all tasted good when cooked as chips and mash. The Soil Association, an Innovative Farmers partner, hopes that highlighting the benefits of alternative potato varieties will help find alternative techniques to manage blight.
Ben Raskin, head of horticulture at the Soil Association said; “Late blight is likely to challenge all potato growers as conventional chemistry becomes more restricted.
There are some systems and management strategies that can help, for instance agroforestry planting can slow the spread of the disease across a field, and plant tonics and stimulant can help boost the crops natural resistance.
However these are limited and the reality is that most certified organic growers either top the crop (using a burner or a flail mower) when late blight arrives, or use copper to control its onset and spread.
“By raising awareness of different varieties amongst growers and consumers in this Innovative Farmers field lab we hope to find more natural answers to such a common and devastating problem as blight.”
The most dangerous current strain of blight is the 13_A2 and traditionally resistant varieties such as Cara and Lady Balfour are now no longer able to withstand the disease.
Breeding by the Savari trust and Agrico has helped increase the number of blight resistant varieties available but not all meet appearance and taste specifications.
The field lab involved a small number of growers across the UK (two growers in Gloucestershire and one in Scotland) as an introductory trial.
The group tested the performance of up to 11 varieties of potato against blight, and then performed a taste test to help convince consumers and retailers that different varieties can also be good to eat. ■