Effect of enhanced nutritional programs and exogenous auxin spraying on huanglongbing severity, fruit drop, yield and economic profitability of orange orchards

Bassanezi, R. B.; Primiano, Isabela Vescove; Vescove, Humberto Vinicius

doi:10.1016/j.cropro.2021.105609

Cited by 14 publications

(9 citation statements)

References 33 publications

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“…Another phloem-limited disease which gave rise to investigations of trunk injection as a targeted delivery method [150] is huanglongbing (HLB), or citrus greening. HLB is a devastating disease associated with phloem-limited bacteria that has wreaked havoc to citrus industries in the USA and worldwide [151][152][153]. In the USA and most of Asia and South America, the disease is associated with Candidatus Liberibacter asiaticus and is transmitted by the Asian citrus psyllid Diaphorina citri.…”

Section: Bacterial and Phytoplasma Diseasesmentioning

confidence: 99%

Trunk Injection as a Tool to Deliver Plant Protection Materials—An Overview of Basic Principles and Practical Considerations

2022

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Trunk injection is a targeted delivery of pesticides, insecticides, nutrients, or other plant protection materials into the stem or trunk of woody plants as an alternative to spraying or soil drenching. Trunk injection has historically been used for disease and pest management of high-value forest tree species or ornamental plants when aerial applications are problematic due to spatial problems and health-related concerns. An interest in using the injection technique for protection of agricultural crops in commercial production systems has emerged more recently, where foliar applications and soil drenches have proven ineffective or pose environmental hazards. This review provides an overview of the basic principles of trunk injection and the plant physiological implications, its current use in commercial agriculture and other plant systems, and associated risks.

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Section: Bacterial and Phytoplasma Diseasesmentioning

confidence: 99%

Trunk Injection as a Tool to Deliver Plant Protection Materials—An Overview of Basic Principles and Practical Considerations

2022

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“…Similarly, da Silva et al [51] found that CLas impaired root growth in sweet oranges regardless of different Cu, Mn, and Zn fertilization schemes. Additionally, Bassanezi et al [52] found no improvements HLB severity and tree yield when testing five different foliar nutrient treatments on sweet oranges in a three-year field study.…”

Section: Discussionmentioning

confidence: 97%

Impact of Ground Applied Micronutrients on Root Growth and Fruit Yield of Severely Huanglongbing-Affected Grapefruit Trees

et al. 2022

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Citrus greening (huanglongbing, HLB) is a bacterial disease caused by Candidatus Liberibacter asiaticus (CLas) and vectored by the Asian citrus psyllid (Diaphorina citri) (ACP). No cure is yet available, and as a result, increased fertilizer applications continue to be a major management method used to prolong the productive life of affected trees. However, questions remain regarding proper fertilizer rates and in what form these nutrients should be applied to increase tree health and yield. Therefore, the goal of this study was to identify optimum micronutrient application forms and rates to increase root growth, canopy size and fruit yield as well as reduce leaf and root CLas cycle threshold (Ct) value of HLB-affected grapefruit trees (Citrus × paradisi Macfad). A large-scale field study consisting of six-year-old HLB-affected ‘Ruby Red’ grapefruit trees grafted on ‘sour orange’ (Citrus × aurantium) rootstock was conducted in the Florida Indian River District. Eight different treatments consisting of four granular and four liquid fertilizers with 1×, 2×, and 4× the current University of Florida, Institute of Food and Agricultural Sciences recommended rates of boron, zinc, manganese, and iron were applied for three times a year (granular), biweekly (liquid), or weekly (liquid), for three years. Root density, length and diameter, root, and leaf CLas Ct value, canopy volume, visual HLB symptoms, and fruit yield were measured throughout the study. Regardless of treatment, tree health declined over time, and no significant impact on severely HLB-affected grapefruit tree health was detected within the three-year time frame of the study. This was the first study to solely compare the impact of ground applied micronutrient application rates and methods on HLB-affected grapefruit tree health in Florida’s Indian River District. More time would be needed to determine the potential benefits of increased micronutrient performance of HLB-affected grapefruit trees.

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“…The activity of biostimulators to promote plant growth is often attributed to their ability to directly or indirectly provide mineral nutrients (mostly N, but also P, S and other macro- and micro-nutrients) to plants. Although optimal growth of plants depends on the availability of adequate mineral nutrients, that growth (and also development, including reproduction) is also regulated by plant hormones (phytohormones), including gibberellins, auxins, cytokinins, abscisic acid, ethylene and other phytohormones ( Bassanezi et al., 2021 ; Wu et al., 2021 ; Liu et al., 2022 ). For example, auxin is involved in the stimulation of cell elongation in shoots and root initiation.…”

Section: Discussionmentioning

confidence: 99%

Potential of carvacrol as plant growth-promotor and green fungicide against fusarium wilt disease of perennial ryegrass

Saghrouchni

Barnossi²,

Mssillou³

et al. 2023

Front. Plant Sci.

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Perennial ryegrass (Lolium perenne L.) is a valuable forage and soil stabilisation crop. Perennial crops have long been associated with good environmental performance and ecosystem stability. Vascular wilt diseases caused by Fusarium species are the most damaging plant diseases affecting both woody perennials and annual crops. Therefore, the aim of the present study was the assessment of the preventive and growth-promoting effects of carvacrol against Fusarium oxysporum, F. solani, and F. nivale (phylogenetically analyzed on the basis of internal transcribed spacer (ITS) regions) causing vascular wilt of ryegrass in vitro and under greenhouse conditions. To accomplish this aim, various parameters were monitored including coleoptile development, rhizogenesis, the incidence of coleoptile lesions, disease index, the visual appearance of ryegrass health, ryegrass organic matter and soil fungal load. The results obtained showed that F. nivale was highly harmful to ryegrass seedlings compared to other Fusarium species. Furthermore, carvacrol with 0.1 and 0.2 mg/mL protected significantly the seedlings against Fusarium wilt diseases both in vitro and in the greenhouse. Simultaneously, carvacrol also functioned as a seedling growth promoter, as is reflected in all monitored parameters, such as the recovery of seedling height and root length, and the development of new leaf buds and secondary roots. Carvacrol proved to be effective plant growth promoter and a bio-fungicide against Fusarium vascular diseases.

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Effect of enhanced nutritional programs and exogenous auxin spraying on huanglongbing severity, fruit drop, yield and economic profitability of orange orchards

Cited by 14 publications

References 33 publications

Trunk Injection as a Tool to Deliver Plant Protection Materials—An Overview of Basic Principles and Practical Considerations

Trunk Injection as a Tool to Deliver Plant Protection Materials—An Overview of Basic Principles and Practical Considerations

Impact of Ground Applied Micronutrients on Root Growth and Fruit Yield of Severely Huanglongbing-Affected Grapefruit Trees

Potential of carvacrol as plant growth-promotor and green fungicide against fusarium wilt disease of perennial ryegrass

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