Uptake of micronutrients in severely HLB-affected grapefruit trees grown on Florida Indian River flatwood soils

Hallman, Lukas M.; Kadyampakeni, Davie M.; Ferrarezi, Rhuanito Soranz; Wright, Alan L.; Ritenour, Mark A.; Rossi, Lorenzo

doi:10.1080/01904167.2023.2221287

Journal of Plant Nutrition

2023

DOI: 10.1080/01904167.2023.2221287

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Uptake of micronutrients in severely HLB-affected grapefruit trees grown on Florida Indian River flatwood soils

Lukas M. Hallman

Davie M. Kadyampakeni

Rhuanito Soranz Ferrarezi

et al.

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Cited by 2 publications

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“…Notably, the themes of "prevention and control" have gained increasing attention since 2018 (Supplementary Material 1). China, Brazil, and the United States, which are the major global citrus growers, have all grappled with the impacts of HLB (Cui et al, 2022;Da Silva et al, 2019;Ding et al, 2020;Gao et al, 2022;Hallman et al, 2023). This disease has had far-reaching consequences on the economy, the society, and the environment.…”

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confidence: 99%

Possible economic losses on the oranges production chain of Peru due to introduction of Huanglongbing (HLB): Simulation of prospective scenarios to 2045

Mercado,

Guadalupe,

Vega Alegre

2023

Sci. agropecu.

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Huanglongbing (HLB) is a citrus disease known for causing significant production losses, and its potential introduction into Peru looms on the horizon. The aim of this study was to assess the potential economic losses within the Central Jungle's orange production chain, specifically in the Region Junín. This assessment involved simulating the spread of HLB under prospective scenarios spanning from 2026 to 2045, aiming to estimate the cost-benefit of preventing these losses through the implementation of a national phytosanitary program (PNF). The methodology employed in this study comprised administering questionnaires to local growers and estimating economic losses across three scenarios. The first scenario assumed a baseline production trend without HLB presence, while the second scenario considered an epidemiological situation with HLB but without the implementation of a PNF. The third scenario factored in HLB with varying degrees of adoption among PNF-affiliated growers. The findings highlight several risk factors contributing to the potential spread of HLB in Junín. The epidemiological model reveals that HLB can swiftly render young trees unproductive. Cumulatively, economic losses from 2026 to 2045 could reach a staggering US$ 371,146 thousand if no intervention takes place. However, this figure could be significantly reduced to US$ 44,890 thousand if 100% of growers embrace the PNF. Such public policy measures would not only prevent production losses but also generate substantial social benefits. These scenarios underscore the stark negative impacts HLB could inflict on the local orange production chain. The implementation of the PNF proves to be a critical intervention, preventing production losses, preserving jobs, and safeguarding related economic activities. Without timely public intervention, the economic losses at stake could render the agribusiness sector unsustainable.

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mentioning

confidence: 99%

Possible economic losses on the oranges production chain of Peru due to introduction of Huanglongbing (HLB): Simulation of prospective scenarios to 2045

Mercado,

Guadalupe,

Vega Alegre

2023

Sci. agropecu.

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Use of hardwood mulch applications to improve soil characteristics of Alfisols used in Florida citrus production

Hallman,

Santiago,

Fox

et al. 2023

Front. Soil Sci.

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IntroductionImproving soil fertility is a top priority in Florida’s citrus growing regions, especially in the age of Huanglongbing (HLB; also known as citrus greening). This disease severely reduces fine root mass, causes higher incidences of nutrient deficiencies, and eventually results in the death of affected trees. Additionally, the soils commonly found in Florida’s citrus growing regions are sandy (greater than 98%) and naturally low in fertility, making the nutrient management of HLB-affected trees even more challenging. As a result, interest in organic amendments to increase soil fertility are being tested. Although hardwood chip mulches are successfully used in other regions of the country, no studies exist observing their use on the soils in Florida’s citrus growing regions; therefore, the objectives of this study were to measure the impacts of hardwood oak mulch on (i) Florida Alfisols characteristics and (ii) HLB-affected citrus trees.MethodsA two-treatment field study using 6-year-old ‘Valencia’ sweet orange trees (Citrus × sinensis) grafted on US-812 (C. reticulata × C. trifoliata) rootstock was conducted in Florida’s Indian River District (IRD). The experimental treatment consisted of 0.08 m of hardwood chip mulch sourced from oak trees applied every September for 3 years (2020, 2021, and 2022) while the control treatment had no mulch applied. Soil chemical and physical properties, leaf nutrient concentration, and leaf Candidatus Liberibacter asiaticus (CLas) titer was collected in the fall (October), winter (January), spring (April), and summer (July).Results and discussionOverall, after 3 years, oak mulch applications increased soil available phosphorus (32%), potassium (66%), magnesium (71%), organic matter (49%), and moisture (25-88%, depending on the season); however, oak mulch inconsistently impacted leaf nutrient concentrations and was not effective at suppressing HLB. The results show that annual applications of hardwood oak mulch can improve the chemical and physical properties of sandy soils within three years, however, these improvements did not reduce the severity of HLB.

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Uptake of micronutrients in severely HLB-affected grapefruit trees grown on Florida Indian River flatwood soils

Cited by 2 publications

References 44 publications

Possible economic losses on the oranges production chain of Peru due to introduction of Huanglongbing (HLB): Simulation of prospective scenarios to 2045

Possible economic losses on the oranges production chain of Peru due to introduction of Huanglongbing (HLB): Simulation of prospective scenarios to 2045

Use of hardwood mulch applications to improve soil characteristics of Alfisols used in Florida citrus production

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