Suitability of introduced Nymphoides spp. (Nymphoides cristata, N. peltata) as targets for biological control in the United States

Harms, Nathan E.; Nachtrieb, Julie

doi:10.21079/11681/32347

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…Since mechanical harvesting results in plant material breaking off during removal, mechanical control is not a suitable management option because CFH and similar species can propagate through fragmentation (i.e., when stems/leaves break off a parent plant to form new plants) [12]. While biological control development is recommended and being investigated for CFH, it is not yet a viable control strategy [17]. Thus, herbicide control is the primary management method for CFH and related FLAV species.…”

Section: Aquatic Vegetation Managementmentioning

confidence: 99%

Monitoring the Efficacy of Crested Floatingheart (Nymphoides cristata) Management with Object-Based Image Analysis of UAS Imagery

et al. 2021

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This study investigates the use of unmanned aerial systems (UAS) mapping for monitoring the efficacy of invasive aquatic vegetation (AV) management on a floating-leaved AV species, Nymphoides cristata (CFH). The study site consists of 48 treatment plots (TPs). Based on six unique flights over two days at three different flight altitudes while using both a multispectral and RGB sensor, accuracy assessment of the final object-based image analysis (OBIA)-derived classified images yielded overall accuracies ranging from 89.6% to 95.4%. The multispectral sensor was significantly more accurate than the RGB sensor at measuring CFH areal coverage within each TP only with the highest multispectral, spatial resolution (2.7 cm/pix at 40 m altitude). When measuring response in the AV community area between the day of treatment and two weeks after treatment, there was no significant difference between the temporal area change from the reference datasets and the area changes derived from either the RGB or multispectral sensor. Thus, water resource managers need to weigh small gains in accuracy from using multispectral sensors against other operational considerations such as the additional processing time due to increased file sizes, higher financial costs for equipment procurements, and longer flight durations in the field when operating multispectral sensors.

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Section: Aquatic Vegetation Managementmentioning

confidence: 99%

Monitoring the Efficacy of Crested Floatingheart (Nymphoides cristata) Management with Object-Based Image Analysis of UAS Imagery

et al. 2021

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“…For example, some invasive lineages can vary in their response to herbicides (e.g., Netherland and Willey 2017;Chorak and Thum 2020). Moreover, the genetic makeup of invasive spe-cies may be important for identifying welladapted biocontrol agents in the source region (Blossey et al 1994;Williams et al 2018;Harms and Nachtrieb 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Invasive N. peltata populations often are managed with a mixture of herbicide and mechanical removal treatments, and biological control options are being evaluated (Harms and Nachtrieb 2019). One instance of natural damage from the fungus Septoria villarsiae has been reported in Maine (De Souza et al 2021), and this or other herbivorous or pathogenic species could become feasible on a larger scale (Harms and Nachtrieb 2019). Like many aquatic plant species, N. peltata can reproduce both asexually and sexually.…”

Section: Introductionmentioning

confidence: 99%

Assessing the genetic diversity of Nymphoides peltata in the native and adventive range using microsatellite markers

Tippery,

Harms,

Purcell

et al. 2024

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Nymphoides peltata (yellow floatingheart), native to Eurasia, is an invasive plant in the USA, where it grows in relatively isolated but widespread populations. The species is capable of sexual reproduction by seed and asexual reproduction through fragmentation. Although N. peltata is recognized as a noxious weed, little is known about its geographic region of origin or its dispersal mechanisms and relative amount of genetic variation in its adventive range. We conducted a genetic analysis of N. peltata by studying 68 localities across the native range and 47 localities in the adventive range, using microsatellite markers to determine genetic variability within and among populations, and to infer regions in the native range from which invasive plants originated. A large number of sites in the USA were genetically identical to one another, and there were two predominant multilocus allele phenotypes that were distributed in the northern and southern latitudes, respectively. Additional USA sites were similar to one of the predominant genetic profiles, with greater genetic diversity in southern populations. The genetically identical sites are consistent with asexual spread, potentially via anthropogenic mechanisms. Plants across the USA range were observed to produce viable seeds, and some genetic variation could be explained by sexual reproduction. All USA plants were more similar to plants in Europe than they were to plants in Asia, indicating that the plants likely were introduced originally from Europe. The existence of two genetic clusters and their similarity to plants in different parts of Europe constitute evidence for at least two N. peltata introductions into the USA.

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“…Herbicides are a popular method, however, the use of chemicals can have adverse effects on non-target species in the ecosystem (Madsen 2000). Biological controls use a host-speci c organism that targets the invasive plant to suppress its growth and spread (Harms and Nachtrieb 2019). The interaction between the plant and its natural enemy is the central determining factor for expanding or controlling the spread of the plant.…”

Section: Introductionmentioning

confidence: 99%

The potential of Elophila obliteralis larvae (waterlily leafcutter moth) as a biological control for the invasive aquatic plant Nymphoides peltata (yellow floating heart)

Tomasko

Jennrich

Gorbach

et al. 2022

Preprint

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We tested the potential of Elophila obliteralis larvae (waterlily leafcutter moth, native to the eastern United States) as a biological control for Nymphoides peltata (yellow floating heart). N. peltata , an invasive aquatic floating-leaved plant in the United States, grows in mats creating profound shade reducing macrophyte community biodiversity below the water’s surface. The larvae cut pieces from its host plant’s foliage to live in and consume. It is hypothesized that the E. obliteralis larva has potential as a biological control for N. peltata ; as the density of larvae to leaf SA (surface area (cm 2 )) increases, a greater decline of leaf SA occurs. To determine the ability of the larvae to control the plant, different density ratios of larvae: leaf SA (1:8, 1:4, and no larva=control) were observed over 5 weeks, measuring the progression using Leafscan app. The higher density of larvae to leaf SA resulted in more foliage consumed. The treatments had a mean percent change ± standard deviation of +0.43% ± 22.26% SD (control), -40.37% ± 29.48% SD (1:8), and -71.27% ± 21.95% SD (1:4) from week 0-5. A one-way repeated measure ANOVA found a statistically significant difference among treatment groups (F= 10.51, p=0.002), indicating a significant effect of the larvae on plant SA. Observationally, the larvae impacted regrowth of the plant. These results indicate that E. obliteralis is a potential biological control for N. peltata . Future research should be conducted.

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Suitability of introduced Nymphoides spp. (Nymphoides cristata, N. peltata) as targets for biological control in the United States

Cited by 9 publications

References 28 publications

Monitoring the Efficacy of Crested Floatingheart (Nymphoides cristata) Management with Object-Based Image Analysis of UAS Imagery

Monitoring the Efficacy of Crested Floatingheart (Nymphoides cristata) Management with Object-Based Image Analysis of UAS Imagery

Assessing the genetic diversity of Nymphoides peltata in the native and adventive range using microsatellite markers

The potential of Elophila obliteralis larvae (waterlily leafcutter moth) as a biological control for the invasive aquatic plant Nymphoides peltata (yellow floating heart)

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