An investigation into the spatial patterns of invasive common milkweed (Asclepias syriaca L.) stands through the utilization of drone images
Bakacsy L, Zakar T. Scientific reports, August 2025.
Read the paper Free to read · doi:10.1038/s41598-025-14034-8
What this paper is about
Common milkweed is an invasive weed in Europe, and in the Pannonian sand grasslands of Hungary it is the main threat to a protected habitat. This study flew drones over milkweed stands and compared what the imagery showed against conventional ground survey.
The point is practical: mapping how stands spread year to year is the basis of controlling them, and ground survey does not scale.
Summarised here from the abstract below. Not the authors’ words.
Abstract
The phenomenon of biological invasions represents one of the most significant threats to biodiversity. A fundamental aspect of combating invasive plant species is the comprehension of the spatial and temporal alterations in their population dynamics. One of the important habitats of the European Union is the Pannon sand grasslands in Hungary, which are primarily threatened by the invasive common milkweed (Asclepias syriaca). The objective of this study was to ascertain the efficacy of drone imaging in examining the spatial patterns of milkweed shoots in comparison to ground survey data. To facilitate comparison, a survey was conducted on 12 milkweed populations in the Fülöpháza area of Kiskunság National Park. In each population, a 12-meter transect (comprising six contiguous 2 m × 2 m quadrats) was designated within which the positions of the shoots were recorded with centimeter accuracy through ground surveys. The individual shoots were marked on images captured from an altitude of 20 m using a drone. The results indicated that the number of shoots identified in the drone images was slightly lower than in the ground surveys; however, a positive correlation was observed between the two datasets (r = 0.9594). A strong positive correlation was evident between the ground and drone surveys in terms of both the average distance between shoots and the observed pattern (r = 0.933 and r = 0.9146). In light of these findings, it can be concluded that drone imaging represents an effective method for examining the size and pattern of populations. Consequently, it may prove to be a valuable tool for the accurate planning of invasive species management in conservation efforts and the monitoring of the effectiveness of treatments.
Abstract reproduced from the published paper, which is licensed CC BY. Copyright remains with the authors.
Key terms
Milkweeds in this paper
- Common Milkweed Asclepias syriaca
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title = {An investigation into the spatial patterns of invasive common milkweed (Asclepias syriaca L.) stands through the utilization of drone images (listing)},
author = {{Milkweed USA}},
year = {2026},
url = {https://milkweedusa.com/research/an-investigation-into-the-spatial-patterns-of-invasive-common-2025/},
note = {Accessed DATE}
}