Design, synthesis and biological evaluation of novel fungicides for the management of Fusarium DieBack disease

Bonilla‐Landa, Israel; Cruz, Osvaldo León de la; Sánchez-Rangel, Diana; Ortíz-Castro, Randy; Haas, Benjamin Rodriguez; Barrera‐Méndez, Felipe; Gómez, Ramón Enrique Diaz de León; Medrano, Francisco Javier Enriquez; Olivares‐Romero, José Luis

doi:10.29356/jmcs.v62i3.531

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…In the phytotoxicity assay, the length of the seedling's root appeared relatively favorable when compared to previous studies involving non-encapsulated molecules, as reported by Bonilla et al (2019). The same trend was observed in the analysis of lateral roots.…”

Section: Discussionsupporting

confidence: 75%

Triazoles nanoencapsulation in polylactic acid to reduce phytotoxicity in roots

Beltrán,

Viveros,

Contreras

et al. 2024

Preprint

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The use of effective fungicides, such as propiconazole, a high-efficacy and broad-spectrum systemic fungicide, has been a common commercial strategy to combat fungal diseases. However, their indiscriminate and uncontrolled use provokes phytotoxicity in plant roots. Therefore, the objective of this study is to reduce the root phytotoxicity of triazole fungicides through their nanoencapsulation in biodegradable polylactic acid polymer matrices. Using the emulsion and solvent evaporation encapsulation method, the obtained nanoparticles had a hydrodynamic diameter of approximately 200 to 400 nm, an encapsulation efficiency of around 40%, a smooth surface, and a zeta potential close to -40 mV, having great colloidal stability. Experiments with Arabidopsis thaliana demonstrated that the nanoencapsulation of a fungicide derived from propiconazole reduced its phytotoxicity, increasing the length of the roots over 70% more than when the molecule was applied directly, losing only about 15% of its antifungal activity, as shown by the test performed on Fusarium solani. This suggests that nanoencapsulation with biodegradable polymer matrices acts as a protective mechanism for plant roots, which may have practical applications in crop protection and the promotion of sustainable agriculture. However, further research is needed to evaluate its efficacy under field conditions and its long-term environmental impact.

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Section: Discussionsupporting

confidence: 75%

Triazoles nanoencapsulation in polylactic acid to reduce phytotoxicity in roots

Beltrán,

Viveros,

Contreras

et al. 2024

Preprint

Self Cite

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“…These hosts probably do not produce allomones that deter initial attack by PSHB but can deter its colonization even after establishment of F. euwallaceae . These hosts may therefore still be vulnerable to fusarium wilt (Bonilla‐Landa et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

Invasion of an Afrotemperate forest complex by the polyphagous shot hole borer beetle

Townsend,

van Rooyen,

Hill

et al. 2024

Entomologia Exp Applicata

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The polyphagous shot hole borer (PSHB), Euwallacea fornicatus Eichhoff (Coleoptera: Curculionidae, Scolytinae), is a significant tree‐killing pest recently introduced into South Africa. Many native trees in urban settings are susceptible to infestation, but the presence of PSHB in natural ecosystems is unstudied. The presence and drivers of PSHB colonization in 1682 trees of 68 species were evaluated in 51 plots across a native Afrotemperate forest complex in South Africa. Breeding colonies of PSHB were found in six native species (breeding hosts). An additional 11 species did not contain PSHB colonies but hosted its mutualistic fungus Fusarium euwallaceae Freeman et al. (Hypocreales: Nectriaceae). Invasibility increased when plots were closer to the urban infestation border, further away from surface water, and when containing a larger number of breeding hosts. Invasibility decreased with an increase in tree species richness. Polyphagous shot hole borers were found in climax forest distant to urban areas at sites frequented by tourists. The severity of infestation of trees increased with an increase in host diameter, breeding host abundance, and infested tree abundance. Probability of infestation increased with an increase in the number of infested trees. Infested trees were not spatially clumped. Instead, PSHB preferentially selected eight of the 17 native host species. And the data suggest that larger trees of these species may be more susceptible to PSHB. Eight species were infested at random and two were infested seemingly accidentally. Infestations increased more rapidly on larger trees and on those surrounded by a high abundance of breeding hosts. This study confirms that Afrotemperate forests are highly susceptible to invasion by PSHB. Direct anthropogenic impact had no discernible effect on infestations, but humans aided spread of PSHB to distant sites. Halting movement of contaminated wood is important. Management of PSHB should focus on highly infested areas and trees as these increase the likelihood of further and more severe infestations.

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“…Additionally, the application of commercial chemicals for prolonged periods could result in phytotoxicity. [63][64][65] In South Africa, no insecticides or fungicides that have been evaluated with scientific rigour for efficacy in PSHB management have been registered for use.…”

Section: Mitigationmentioning

confidence: 99%

The polyphagous shot hole borer beetle: Current status of a perfect invader in South Africa

et al. 2021

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The polyphagous shot hole borer (PSHB) beetle is a recent invader in South Africa. Together with its fungal symbiont, Fusarium euwallaceae, it can rapidly kill highly susceptible host plants. Its impact is most profound in urban areas, but it has also been found infesting important forestry, agricultural crop and native species. Since its first detection in 2012, PSHB has spread to all but one province in the country. The beetle–fungus complex has several biological traits that enhance its anthropogenically mediated dispersal, establishment and survival in novel environments – factors that have likely facilitated its rapid spread across the country. We review the history of the PSHB invasion in South Africa, its taxonomic status and the reasons for its rapid spread. We highlight its potential impact and challenges for its management. Finally, we provide an updated distribution map and list of confirmed host plants in South Africa. Of the 130 plant species identified as hosts, 48 of these (19 indigenous and 29 introduced) are reproductive hosts able to maintain breeding PSHB populations. These reproductive hosts may succumb to beetle infestations and act as ‘pest-amplifiers’. The economic impact on urban forests, plantation forestry and agricultural crops may be severe, but the ecological impact of PSHB invasion in native ecosystems should not be underestimated.

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Design, synthesis and biological evaluation of novel fungicides for the management of Fusarium DieBack disease

Cited by 4 publications

References 8 publications

Triazoles nanoencapsulation in polylactic acid to reduce phytotoxicity in roots

Triazoles nanoencapsulation in polylactic acid to reduce phytotoxicity in roots

Invasion of an Afrotemperate forest complex by the polyphagous shot hole borer beetle

The polyphagous shot hole borer beetle: Current status of a perfect invader in South Africa

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