Demonstrative effects of crude extracts of  Desmodium  spp. to fight against the invasive weed species  Tagetes minuta

Ngondya, Issakwisa B.; Treydte, Anna C.; Ndakidemi, Patrick A.

doi:10.1016/j.chnaes.2016.03.001

Cited by 11 publications

(23 citation statements)

References 12 publications

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“…High concentrations of DuL extract suppressed the G. cordifolia germination rate by over 50 % compared to DuR, DiL and DiR. Similarly, the effectiveness of DuL in suppressing germination and seedling vigor of the invasive weed species Tagetes minuta was previously reported (Ngondya et al 2016 ). Moreover, Khan et al ( 2008 ) argued that the successful control of Striga hermonthica under maize field intercropped with Desmodium species was due to the strong allelopathic effects displayed by D. uncinatum .…”

Section: Discussionsupporting

confidence: 52%

“…We chose these two Desmodium species as they are generally preferred by herbivores (Heuze et al 2015a , b ) and, thus, could be inter-planted in invaded areas to potentially suppress G. cordifolia. Further, these two species successfully suppressed germination of the weed plant T. minuta (Ngondya et al 2016 ) and, hence, we expected the same effect towards G. cordifolia . While providing feed to animals, particularly D. uncinatum is known to successfully control some very problematic weeds such as Striga species (Khan et al 2006a , b ; Pickett et al 2013 ).…”

Section: Introductionmentioning

confidence: 52%

“…However, as chemical control using herbicides is often not advised in natural ecosystems, and particularly in protected rangelands, less ecologically intrusive management options must be adopted. Hence, recently, the possibility of using native plants with allelopathic properties as a potential bioherbicide has been discussed (Khanh et al 2007 ; Sodaeizadeh and Hosseini 2012 ; Khan et al 2008 ; Ngondya et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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A nature-based approach for managing the invasive weed species Gutenbergia cordifolia for sustainable rangeland management

2016

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BackgroundThe invasive weed species Gutenbergia cordifolia has been observed to suppress native plants and to dominate more than half of the entire crater floor (250 km2) in the Ngorongoro Conservation Area (NCA). As this species has been found to be toxic to ruminants it might strongly impact animal populations in this ecologically diverse ecosystem. Hence, a nature-based approach is urgently needed to manage its spread. We tested two Desmodium spp extracts applied to G. cordifolia and assessed the latter’s germination rate, height, fresh weight and leaf total chlorophyll content after 30 days in both laboratory and screen house experiments.ResultsSeedling germination rate was halved by Desmodium uncinatum leaf extract (DuL), particularly under higher concentrations (≥75 %) rather than lower concentrations (≤62.5 %). Likewise, in both laboratory and screen house experiments, germination rate under DuL treatments declined with increasing concentrations. Seedling height, fresh weight and leaf total chlorophyll content (Chl) were also most strongly affected by DuL treatments rather than D. uncinatum root extract, Desmodium intortum leaf extract or D. intortum root extract treatments. Generally, seedlings treated with higher DuL concentrations were half as tall, had one-third the weight and half the leaf Chl content compared to those treated with lower concentrations.ConclusionOur study shows a novel technique that can be applied where G. cordifolia may be driving native flora and fauna to local extinction. Our data further suggest that this innovative approach is both ecologically safe and effective and that D. uncinatum can be sustainably used to manage invasive plants, and thus, to improve rangeland productivity.

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Section: Discussionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

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A nature-based approach for managing the invasive weed species Gutenbergia cordifolia for sustainable rangeland management

2016

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“…Thus, heavy infestations of invasive plants can cause changes in ecosystem structure and function (Cappuccino and Carpenter 2005;Adhikari et al 2015) and subsequently biological and economic losses (Callaway et al 2008;Bajwa et al 2019). While suppressing of invasives is often attempted, many approaches have been unsuccessful (Shabbir et al 2013;Kaur et al 2014), damaging to the rest of the environment (Ngondya et al 2016a) and highly expensive (Mcconnachie et al, 2011;Pratt et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…We investigated the allelopathic effect of naturalised plant Desmodium uncinatum (Fabaceae) leaf crude extract (DuL) in suppressing seed germination and seedling growth of P. hysterophorus. We chose D. uncinatum because its bio-herbicide potential was previously documented to suppress growth and germination of the invasive species Tagetes minuta (Ngondya et al 2016a) and Gutenbergia cordifolia (Ngondya et al 2016b) in Tanzania, and Striga hermonthica in Kenya (Guchu et al 2007;Hooper et al 2010). We used lab, pot and field plot experiments to quantify the effect of different DuL crude extract concentrations on seed germination and seedling growth of P. hysterophorus.…”

Section: Introductionmentioning

confidence: 99%

Bio-herbicide potential of naturalised Desmodium uncinatum crude leaf extract against the invasive plant species Parthenium hysterophorus

2019

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The exotic plant Parthenium hysterophorus is rapidly invading ecosystems in sub-Saharan Africa, with negative effects on the environment, economy and human and animal health. With the exception of some synthetic herbicides, none of the available management methods have been effective against P. hysterophorus, and carry risks to the environment. Therefore, additional management methods must be explored for an effective integrated approach. Despite the fact that bio-herbicides are considered cost-effective and eco-friendly in mitigating biological invasions, little work has been done to utilize them for controlling P. hysterophorus. We investigated allelopathic effects and, thus, bio-herbicide potential of naturalised Desmodium uncinatum leaf (DuL) crude extract in various concentrations to control P. hysterophorus. Our results revealed that DuL crude extract can suppress P. hysterophorus, particularly at higher concentrations. The 75% and 100% DuL crude extract concentrations reduced the total leaf chlorophyll content by 26% and 22% in pots and plots, respectively. Further, these higher concentrations inhibited P. hysterophorus seed germination by 73% in petri dishes, 60% in pots, and 57% in plots, and negatively interfered with seedling growth vigour. Seedling stem heights under 75% and 100% DuL concentrations in pot and plot experiments was about 30% and 36% shorter than those sprayed with lower concentrations (< 70%) and the control, respectively. We show that naturalised plants with allelochemicals can be used as a management tool for controlling P. hysterophorus infestations in sub-Saharan Africa, particularly in Tanzania, and this method should become part of an integrated control toolkit being deployed in a communitybased approach.

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Forest-based Plants in Beautification and Their Medicinal Significance

Pant

Thakur

2021

Non-Timber Forest Products

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Demonstrative effects of crude extracts of Desmodium spp. to fight against the invasive weed species Tagetes minuta

Cited by 11 publications

References 12 publications

A nature-based approach for managing the invasive weed species Gutenbergia cordifolia for sustainable rangeland management

A nature-based approach for managing the invasive weed species Gutenbergia cordifolia for sustainable rangeland management

Bio-herbicide potential of naturalised Desmodium uncinatum crude leaf extract against the invasive plant species Parthenium hysterophorus

Forest-based Plants in Beautification and Their Medicinal Significance

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