Seaweeds in the Control of Plant Diseases and Insects

Machado, Levi Pompermayer; Gasparoto, Maria Cândida de Godoy; Filho, Norival Alves Santos; Pavarini, Ronaldo

doi:10.1201/9780429487156-6

Cited by 6 publications

(5 citation statements)

References 1 publication

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“…There is an abundance of global research on the use NPs under controlled laboratory conditions [17], but relatively fewer products have been developed for commercial use in variable field situations [15], often because of inadequate field research, problems associated with inconsistent efficacy, undesirable side effects such as growth of unwanted organisms, or difficulties with formulation [25]. Some of the most successful and widely used NPs that are commercially available include: sulphur, which remains the mainstay of powdery mildew control [26]; harpin proteins, which elicit plant defences [14]; chitosan, which is both an elicitor and directly antifungal [16]; giant knotweed extract (Regalia ® ) which is effective against PM [18]; seaweeds, although seaweed extracts are often used for growth enhancement rather than for disease control, per se [27]. Although plant oils are used frequently in horticulture as adjuvants [28], they are rarely the active ingredient in biofungicides, the exception being a tea tree oil extract (Timorex Gold ® ), which is effective against PM [29].…”

Section: Discussionmentioning

confidence: 99%

Lipid-Based Natural Food Extracts for Effective Control of Botrytis Bunch Rot and Powdery Mildew on Field-Grown Winegrapes in New Zealand

Wurms

Chee

Wood

et al. 2021

Plants

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Synthetic controls of crop pathogens are increasingly associated with harm to the environment and human health, and pathogen resistance. Pesticide residues in crops can also act as non-tariff trade barriers. There is therefore a strong imperative to develop biologically based and natural product (NP) biofungicides as more sustainable alternatives for crop pathogen control. We demonstrate the field efficacy, over multiple seasons, of NP biofungicides, NP1 (based on anhydrous milk fat) and NP2 (based on soybean oil), on two major diseases of winegrapes—Botrytis bunch rot (Botrytis) and powdery mildew (PM). The NPs were integrated into a season-long integrated disease management programme that has produced chemical-residue-free wines. Efficacies for Botrytis control on three different varieties were: 63–97% on Chardonnay, 0–96% for Sauvignon Blanc and 46–58% on Riesling; with 65–98% PM control on Chardonnay and Riesling. NP2 exhibited the significant control of Botrytis latent infections, making it a viable alternative to mid-season synthetic fungicides. Disease control was significantly better than the untreated control and usually as efficacious as the synthetic fungicide treatment(s). Yields and wine quality in NP-treated crops were normally equivalent to those in the synthetic fungicide treatments. The results indicate that NP-mediated disease control of Botrytis and powdery mildew can be obtained in the vineyard, without synthetic fungicide input.

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Section: Discussionmentioning

confidence: 99%

Lipid-Based Natural Food Extracts for Effective Control of Botrytis Bunch Rot and Powdery Mildew on Field-Grown Winegrapes in New Zealand

Wurms

Chee

Wood

et al. 2021

Plants

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“…The method used is an adaptation of the diffusion method from Ambika and Sujatha [ 58 ] and Machado et al [ 59 ]. Potato dextrose agar (PDA) was used as the growth medium (39 g L −1 ) and supplemented with the antibiotic chloramphenicol (0.048 g L −1 ) to minimize other microorganisms that might otherwise grow on the medium.…”

Section: Methodsmentioning

confidence: 99%

Chlorella vulgaris and Tetradesmus obliquus Protect Spinach (Spinacia oleracea L.) against Fusarium oxysporum

Viana,

Genevace,

Gama

et al. 2024

Plants

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Chlorella vulgaris and Tetradesmus obliquus were tested as biocontrol agents against the phytopathogenic fungus Fusarium oxysporum. This evaluation was conducted through in vitro and in vivo trials with spinach (Spinacia oleracea L.). The in vitro trials showed that C. vulgaris and T. obliquus were able to inhibit the phytopathogen, showing a similar inhibitory effect to that of the positive controls (Rovral, BASF® and Biocontrol T34, Biocontrol Technologies® S.L.). C. vulgaris aqueous suspensions at 3.0 g L−1 led to a hyphal growth of 0.55 cm, each corresponding to a reduction of 63% of fungal growth. With T. obliquus, the hyphal growth was 0.53 cm when applied at a concentration of 0.75 g L−1, having an inhibition of fungus growth of 64%. Thereafter, these results were validated in an in vivo trial on spinach using the same controls. The results revealed a lower severity and disease incidence and a reduction in the disease’s AUDPC (area under the disease progress curve) when spinach was treated with the microalgae suspensions. Overall, these findings highlight the potential of C. vulgaris and T. obliquus suspensions as promising biocontrol agents against F. oxysporum in spinach when applied through irrigation.

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“…Research into the pesticidal properties of seaweeds will continue to remain relevant to the fields of agriculture and forestry (Machado et al 2019;O'Keeffe et al 2019b). Owing to the versatility of natural compounds present in seaweeds, there is no doubt that they are viable tools to help advance research in areas concerned with sustainable integrated pest management (IPM).…”

Section: Seaweeds As Biopesticides For Sustainable Agricultural/ Fore...mentioning

confidence: 99%

“…The harsh competitive marine environment they thrive in, which constitutes several biotic and abiotic stressors (Hu et al 2016), stimulates them to synthesize and host a wide array of bioactive molecules (Cikoš et al 2021;Salehi et al 2019) for adaptation and survival. These metabolites have given seaweeds and algae in general huge relevance, making them vital tools for natural product research applicable in several fields of study, including agriculture and forestry (Machado et al 2019).…”

Section: Introductionmentioning

confidence: 99%

The potential of seaweeds as a rich natural source for novel bioherbicide formulation/development

Chukwuma,

Tan,

Hughes

et al. 2024

Weed Sci

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Recently, there has been emphasis on the need to shift away from the use of synthetic chemical herbicides to low risk alternatives derived from natural sources. This is aimed at lowering or averting the negative impact synthetic herbicides have on the environment and to deal with the emergence of weed species becoming resistant to these chemicals. As a result, more stringent measures or an outright ban on the use of most synthetic herbicides have been put in place by regulatory bodies. As seaweeds are abundant resources in the marine environment that have the capacity to produce diverse bioactive compounds, they could serve as sustainably viable natural, low-risk alternatives/sources to explore for potential phytotoxic capabilities. This could in turn help to enhance or boost the availability of effective solutions in the global bioherbicide market. This review highlights the prospects of using seaweeds as novel biopesticides for the control and management of various plant pests including weed species, and for the development of sustainable agriculture/forestry practices. More specifically, the review focuses on their use as a rich natural source for novel bioherbicide development, a potential that has remained underexplored for many years. However, to unlock the full potential of seaweed-derived bioherbicides and to create a potential path towards its development, increased research and development efforts are urgently needed. This is to tackle and overcome possible constraints posed in this novel area such as variability in seaweed chemical composition, formulation technologies, stability and efficacy of seaweed bioactive compounds, cost and scalability, environmental considerations, etc.

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Seaweeds in the Control of Plant Diseases and Insects

Cited by 6 publications

References 1 publication

Lipid-Based Natural Food Extracts for Effective Control of Botrytis Bunch Rot and Powdery Mildew on Field-Grown Winegrapes in New Zealand

Lipid-Based Natural Food Extracts for Effective Control of Botrytis Bunch Rot and Powdery Mildew on Field-Grown Winegrapes in New Zealand

Chlorella vulgaris and Tetradesmus obliquus Protect Spinach (Spinacia oleracea L.) against Fusarium oxysporum

The potential of seaweeds as a rich natural source for novel bioherbicide formulation/development

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