This paper examines the formation of social groups in the first 3 months following a significant biosecurity incursion, extending our understanding of a social system in the context of an ongoing emergency response. The broader implications of social change and coping responses post-incursion are a relevant and useful discussion worldwide. Farmers (N = 25) were recruited from three dominant banana-growing regions in North Queensland, Australia. Face-to-face interviews were conducted using a semistructured format. Key topics covered included perceptions of Panama Tropical Race 4 (TR4), on-farm biosecurity activities, social influences and comparisons, and personal stress. This qualitative approach uses well-known social psychological constructs to help understand and frame farmers' social behaviours post-incursion. TR4 was perceived as a significant threat by participants; yet, perceptions of vulnerability to TR4 and biosecurity engagement varied. Two dominant social groupings emerged from the data. Active adopters were characterised as proactive and innovative growers, prioritising individual farm protection for the benefit of the broader industry. There was a high level of social support, trust and efficacy, facilitating an adaptive coping style. Passive adopters implemented straightforward and less costly biosecurity measures on farm but were not willing to commit to greater financial or time investments. They expressed an overall wariness towards the biosecurity management process and little trust in authorities. A small subgroup of passive adopters also displayed clear maladaptive coping characteristics (e.g. denial, helplessness) towards TR4, believing that biosecurity action at this point was futile. Proximity to TR4-affected property emerged as having an interactional effect on biosecurity uptake and risk perception. Here, we show for the first time, in situ, the complex social environment post-incursion, indicative of high stress and high uncertainty. Findings can be used on-ground to improve extension engagement and risk communication with growers post-incursion, being mindful there exists a range of coping styles and social influences.