Main content area

The effect of a mixture of two plant growth-promoting bacteria from Argentina on the yield of potato, and occurrence of primary potato diseases and pest – short communication

Trdan, Stanislav, Vučajnk, Filip, Bohinc, Tanja, Vidrih, Matej
Acta agriculturæ Scandinavica 2019 v.69 no.1 pp. 89-94
Alternaria solani, Azospirillum brasilense, Leptinotarsa decemlineata, Phytophthora infestans, Pseudomonas fluorescens, crop yield, field experimentation, fungi, insects, pests, plant growth-promoting rhizobacteria, potatoes, sowing, tubers, Argentina, Europe
In 2017, we conducted a field experiment to test the influence of a mixture of two plant growth-promoting bacteria (Pseudomonas fluorescens and Azospirillum brasilense) on the yield of three potato varieties. In addition, the influence of the mixture on potato susceptibility to infection by the pseudofungus Phytophthora infestans and fungus Alternaria solani and to attacks by the Colorado potato beetle (Leptinotarsa decemlineata) was investigated. It was the first experiment of its kind in Europe. In the unusually hot and dry year, a positive influence on the yield (17%–31%) was found in all three varieties when the tubers were soaked in the bacterial mixture prior to sowing. We observed no significant differences in potato resilience/susceptibility to harmful organisms among the different treatments (soaked tubers, sprayed tubers, untreated tubers); however, there were significant differences in the productivity between the tuber varieties. The results of our research indicate the bacterial mixture used in this study has a high potential to support satisfactory potato yields under dry conditions and under low levels of infection by foliar fungal diseases and attacks by foliar insects.