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Check the list of papers from NScTI Citrus
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2022
Martinelli, Rodrigo; Rufino, Luiz Renato; Cruz, Ricardo Alcántara-De; Conceição, Patricia Marluci; Monquero, Patricia Andrea; Azevedo, Fernando Alves
Glyphosate Excessive Use Affects Citrus Growth and Yield: The Vicious (and Unsustainable) Circle in Brazilian Orchards Journal Article
In: Agronomy, vol. 12, iss. 2, pp. 453, 2022, ISSN: 20734395.
Abstract | Links | BibTeX | Tags: Herbicide drift, phytotoxicity, Return of in-vestment, Weed control, Weed resistance, Yield drop
@article{Martinelli2022,
title = {Glyphosate Excessive Use Affects Citrus Growth and Yield: The Vicious (and Unsustainable) Circle in Brazilian Orchards},
author = {Rodrigo Martinelli and Luiz Renato Rufino and Ricardo Alcántara-De Cruz and Patricia Marluci Conceição and Patricia Andrea Monquero and Fernando Alves Azevedo},
url = {https://www.mdpi.com/2073-4395/12/2/453/htm https://www.mdpi.com/2073-4395/12/2/453},
doi = {10.3390/AGRONOMY12020453/S1},
issn = {20734395},
year = {2022},
date = {2022-01-01},
journal = {Agronomy},
volume = {12},
issue = {2},
pages = {453},
publisher = {MDPI},
abstract = {The excessive use of glyphosate by Brazilian citrus growers leads to a vicious and unsustainable circle: Increasing the glyphosate use and the selection pressure of resistant/tolerant weeds, as well as the phytointoxication of the crop. In addition, there is speculation on the consequences of using glyphosate and the studies are not conclusive. Therefore, this study aimed to evaluate the glyphosate management in citrus orchards by assessing its effects in a 5-year field experiment using different doses and application frequencies. Here, we determine the weed control levels, the orchard growth and fruit yield, as well as the economic viability of the treatments. Higher weed control was observed more often with the increasing frequency of glyphosate application, and occasionally with increasing doses. However, some species predominated even at high glyphosate usage, such as BIDPI (Bidens pilosa (L.)), RAPRA (Raphanus raphanistrum (L.)), and ERICA (Conyza canadensis (L.) Cronquist). Phytotoxicity symptoms were demonstrated up to the fourth year of the orchard, and onwards the plants no longer expressed them. This was a highlight, since there was a decrease over time in growth (up to 5.3 m3) and fruit yield (up to 36.3 t ha−1), with losses that reached −56% of the total income. This is the first report to demonstrate that the increase in glyphosate usage can occasionally increase weed control, but it can also decrease orchard development and its financial via-bility.},
keywords = {Herbicide drift, phytotoxicity, Return of in-vestment, Weed control, Weed resistance, Yield drop},
pubstate = {published},
tppubtype = {article}
}
The excessive use of glyphosate by Brazilian citrus growers leads to a vicious and unsustainable circle: Increasing the glyphosate use and the selection pressure of resistant/tolerant weeds, as well as the phytointoxication of the crop. In addition, there is speculation on the consequences of using glyphosate and the studies are not conclusive. Therefore, this study aimed to evaluate the glyphosate management in citrus orchards by assessing its effects in a 5-year field experiment using different doses and application frequencies. Here, we determine the weed control levels, the orchard growth and fruit yield, as well as the economic viability of the treatments. Higher weed control was observed more often with the increasing frequency of glyphosate application, and occasionally with increasing doses. However, some species predominated even at high glyphosate usage, such as BIDPI (Bidens pilosa (L.)), RAPRA (Raphanus raphanistrum (L.)), and ERICA (Conyza canadensis (L.) Cronquist). Phytotoxicity symptoms were demonstrated up to the fourth year of the orchard, and onwards the plants no longer expressed them. This was a highlight, since there was a decrease over time in growth (up to 5.3 m3) and fruit yield (up to 36.3 t ha−1), with losses that reached −56% of the total income. This is the first report to demonstrate that the increase in glyphosate usage can occasionally increase weed control, but it can also decrease orchard development and its financial via-bility.
2021
Caccalano, M. N.; Dilarri, G.; Zamuner, C. F. C.; Domingues, D. S.; Ferreira, H.
Hexanoic acid: a new potential substitute for copper-based agrochemicals against citrus canker Journal Article
In: Journal of Applied Microbiology, vol. 131, iss. 5, pp. 2488-2499, 2021, ISSN: 1365-2672.
Abstract | Links | BibTeX | Tags: cell division, Disease management, membrane permeabilization, organic acid, phytotoxicity, Xanthomonas citri
@article{Caccalano2021,
title = {Hexanoic acid: a new potential substitute for copper-based agrochemicals against citrus canker},
author = {M. N. Caccalano and G. Dilarri and C. F. C. Zamuner and D. S. Domingues and H. Ferreira},
url = {https://onlinelibrary.wiley.com/doi/full/10.1111/jam.15125 https://onlinelibrary.wiley.com/doi/abs/10.1111/jam.15125 https://ami-journals.onlinelibrary.wiley.com/doi/10.1111/jam.15125},
doi = {10.1111/JAM.15125},
issn = {1365-2672},
year = {2021},
date = {2021-01-01},
journal = {Journal of Applied Microbiology},
volume = {131},
issue = {5},
pages = {2488-2499},
publisher = {John Wiley & Sons, Ltd},
abstract = {Aims: The aim of the study is to evaluate hexanoic acid (HA) as an alternative to manage citrus canker. Methods and Results: The minimal growth inhibitory concentration of HA against Xanthomonas citri subsp. citri was determined at 2·15 mmol l−1 using a respiratory activity assay. Growth curves at different pH values showed that growth inhibition was not due to media acidification induced by HA. The germination rate and root elongation of Lactuca sativa seeds exposed to different concentrations of HA (varying from 0·86 to 5·16 mmol l−1) were assessed to screen for phytotoxicity. The acid exhibited low phytotoxicity for L. sativa at 1·29 and 2·58 mmol l−1. To evaluate the ability of HA to protect citrus against X. citri infection, leaves of Citrus sinensis were sprayed with the acid and subsequently challenged with X. citri. HA at 3·44 mmol l−1 was able to protect citrus against infection, showing a reduction of three orders of magnitude in the number of citrus canker lesions per cm2 when compared to the untreated negative control. Conclusion: HA is a potential alternative to copper for citrus canker management. Significance and Impact of the Study: HA inhibits X. citri growth, exhibits low phytotoxicity and is an alternative to copper for the protection of citrus plants against bacterial infection.},
keywords = {cell division, Disease management, membrane permeabilization, organic acid, phytotoxicity, Xanthomonas citri},
pubstate = {published},
tppubtype = {article}
}
Aims: The aim of the study is to evaluate hexanoic acid (HA) as an alternative to manage citrus canker. Methods and Results: The minimal growth inhibitory concentration of HA against Xanthomonas citri subsp. citri was determined at 2·15 mmol l−1 using a respiratory activity assay. Growth curves at different pH values showed that growth inhibition was not due to media acidification induced by HA. The germination rate and root elongation of Lactuca sativa seeds exposed to different concentrations of HA (varying from 0·86 to 5·16 mmol l−1) were assessed to screen for phytotoxicity. The acid exhibited low phytotoxicity for L. sativa at 1·29 and 2·58 mmol l−1. To evaluate the ability of HA to protect citrus against X. citri infection, leaves of Citrus sinensis were sprayed with the acid and subsequently challenged with X. citri. HA at 3·44 mmol l−1 was able to protect citrus against infection, showing a reduction of three orders of magnitude in the number of citrus canker lesions per cm2 when compared to the untreated negative control. Conclusion: HA is a potential alternative to copper for citrus canker management. Significance and Impact of the Study: HA inhibits X. citri growth, exhibits low phytotoxicity and is an alternative to copper for the protection of citrus plants against bacterial infection.