Three‐way fungal interactions affect the potential biological control of Himalayan balsam, Impatiens glandulifera. (9th March 2023)

• Record Type: Journal Article
• Authors: Razak, Nadia Ab; Gange, Alan C.; Currie, Amanda F.; Sutton, Brian C.; Mansor, Asyraf
• Is Part Of: Weed research. Volume 63:Number 2(2023)
• Page Start: 123
• Page End: 132
• Publication Date: 2023-03-09
• Subjects: arbuscular mycorrhizal fungi -- endophyte -- invasive species -- plant pathogen -- rust fungus; Weeds -- Control -- Periodicals; Herbicides -- Periodicals; 632.5
• DOI: 10.1111/wre.12575
• Languages: English
• ISSNs: 0043-1737

Abstract

Abstract: Himalayan balsam ( Impatiens glandulifera ) is one of the most invasive weeds across Europe. The rust fungus, Puccinia komarovii var. glanduliferae has been introduced as a biological control agent, but success has been patchy. Here, we investigated whether mycorrhizal and endophytic fungi can affect rust efficacy and plant growth. Over three experiments, we found that AM fungi and the rust alone or together consistently reduced plant growth, but this depended on the identity of species in the AM inoculum. Meanwhile, AM fungi increased infection frequency of the endophyte Colletotrichum acutatum . Rust inoculation had no detrimental effects on mycorrhizal colonisation or C. acutatum infection, but the latter two fungi reduced rust sporulation. However, plant size was reduced when all three fungal types were present, suggesting that a combined fungal inoculum offers a promising approach for the control of this weed.