Orchard and nursery dynamics of the effect of interplanting citrus with guava for huanglongbing, vector, and disease management

Gottwald, T. R.; Hall, David G.; Kriss, Alissa B.; Salinas, Elma J.; Parker, P. E.; Beattie, G. A. C.; Nguyen, Minh-Hiep

doi:10.1016/j.cropro.2014.06.009

Cited by 23 publications

(18 citation statements)

References 22 publications

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“…From 73 to 87% (mean 78%) ACP chose and settled in vials during experiments with 'Thai White' guava leaves (Table 5) Analyses of combined data from the experiments with 'Pink' and 'Thai White' guava indicated that both immature and mature leaves of each cultivar were repellent, that mature leaves of 'Thai White' were significantly more repellent than immature leaves, and that repellency to ACP of mature leaves was similar between the two cultivars (Table 6). Gottwald et al (2014) reported a significant reduction in field infestations of ACP in citrus intercropped with 'Pink' guava but not in citrus intercropped with 'Thai White' guava. Repellency to ACP of any guava cultivar could be positively or negatively affected by a number of abiotic and biotic factors.…”

Section: Resultsmentioning

confidence: 94%

“…Since then, a number of research efforts have been made on repellency of guava and other plant species to ACP including Chen et al (2006); Hall et al (2008); Onagbola et al (2011); Rouseff et al (2008); Gottwald et al (2010); Zaka et al (2010); Mann et al (2012); and Robbins et al (2012). Gottwald et al (2014) reported that the Vietnamese guava effect could not be verified in Florida citrus due to problems with nematodes and sensitivity of guava to cold weather. Ultimately, even if guava could be grown in an area, it would likely promote problems with fruit flies in citrus.…”

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confidence: 99%

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Repellency of selected Psidium guajava cultivars to the Asian citrus psyllid, Diaphorina citri

Silva¹,

Hall

Gottwald

et al. 2016

Crop Protection

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Huanglongbing (HLB) is the most devastating disease of citrus worldwide. It is caused by bacteria of the genus 'Candidatus Liberibacter' and transmitted by two psyllid species, the Asian citrus psyllid (ACP) Diaphorina citri, and the African citrus psyllid Trioza erytreae. Considerable research has been conducted toward developing and implementing HLB and ACP management strategies. With respect to ACP control, of interest is that reports indicate guava, Psidium guajava, can be repellent to ACP. We conducted research to further evaluate repellency of guava to ACP. In one set of experiments, guava oil from five Brazilian guava cultivars ('J3', 'Pedro Sato', 'Século XXI', 'Thailand' and 'Paluma') was extracted from leaves (immature and mature) by hydrodistillation in a Clevenger-type apparatus and evaluated for psyllid repellency. In a second set of experiments, repellency of guava leaves to ACP was investigated using leaves (immature and mature) from two guava cultivars in Florida, 'Pink' and 'Thai White'. In each set of experiments, repellency was evaluated by releasing ACP adults into a cage with two large vials, one containing a young flush shoot (= immature leaves) of Murraya exotica (a favored host plant of the psyllid, the flush of which is highly attractive to ACP) and one with M. exotica flush and the test material of interest (guava oil, immature guava leaf or mature guava leaf). The adults were free to move throughout the cage and into the vials, and the number of psyllids in each vial was counted after 24 h. The results showed that all guava materials tested had at least some repellency to ACP. Mature leaves tended to have a greater repellent effect than immature leaves. Each of the five oils exhibited repellency. A report in the literature suggested that sulfur compounds associated with guava may be responsible for ACP repellency. Interestingly, the five guava oil extracts we studied were repellent to ACP but none contained any sulfur compounds. Identification of the constituents responsible for repellency could lead to new ACP management tactics.

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Section: Resultsmentioning

confidence: 94%

mentioning

confidence: 99%

Repellency of selected Psidium guajava cultivars to the Asian citrus psyllid, Diaphorina citri

Silva¹,

Hall

Gottwald

et al. 2016

Crop Protection

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show abstract

“…However, before controls can be implemented in the field they need to be tested for efficacy. There are presently tens if not hundreds of hypothetical interventions that could be tested, including: antibiotics (Zhang et al, 2014), pesticides (Qureshi, Kostyk & Stansly, 2014), biocontrol agents (Michaud, 2002), heat treatment (Hoffman et al, 2013), new tolerant or resistant tree stocks (Dutt et al, 2015), nutrient additions (Gottwald et al, 2012), tree removal (Gottwald, 2010), changes to tree spacing (Martini, Pelz-Stelinski & Stelinski, 2015), intercropping (Gottwald et al, 2014), and psyllid deterrents and barriers (Tisgratog et al, 2016; Tomaseto, Krugner & Lopes, 2016). Even more daunting are the different factorial combinations of interventions to test.…”

Section: Introductionmentioning

confidence: 99%

Mathematical models are a powerful method to understand and control the spread of Huanglongbing

Taylor

Mordecai

Gilligan

et al. 2016

PeerJ

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Huanglongbing (HLB), or citrus greening, is a global citrus disease occurring in almost all citrus growing regions. It causes substantial economic burdens to individual growers, citrus industries and governments. Successful management strategies to reduce disease burden are desperately needed but with so many possible interventions and combinations thereof it is difficult to know which are worthwhile or cost-effective. We review how mathematical models have yielded useful insights into controlling disease spread for other vector-borne plant diseases, and the small number of mathematical models of HLB. We adapt a malaria model to HLB, by including temperature-dependent psyllid traits, “flushing” of trees, and economic costs, to show how models can be used to highlight the parameters that require more data collection or that should be targeted for intervention. We analyze the most common intervention strategy, insecticide spraying, to determine the most cost-effective spraying strategy. We find that fecundity and feeding rate of the vector require more experimental data collection, for wider temperatures ranges. Also, the best strategy for insecticide intervention is to spray for more days rather than pay extra for a more efficient spray. We conclude that mathematical models are able to provide useful recommendations for managing HLB spread.

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“…Experts around the world therefore advocate the use of 'area-wide control' whereby individual growers in an area coordinate their https://doi.org/10.1371/journal.pcbi.1007570.g001 spray applications over a large area [10]. Other control methods are generally considered less effective [4,10,11].…”

Section: Introductionmentioning

confidence: 99%

What makes or breaks a campaign to stop an invading plant pathogen?

et al. 2020

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Diseases in humans, animals and plants remain an important challenge in our society. Effective control of invasive pathogens often requires coordinated concerted action of a large group of stakeholders. Both epidemiological and human behavioural factors influence the outcome of a disease control campaign. In mathematical models that are frequently used to guide such campaigns, human behaviour is often ill-represented, if at all. Existing models of human, animal and plant disease that do incorporate participation or compliance are often driven by pay-offs or direct observations of the disease state. It is however very well known that opinion is an important driving factor of human decision making. Here we consider the case study of Citrus Huanglongbing disease (HLB), which is an acute bacterial disease that threatens the sustainability of citrus production across the world. We show how by coupling an epidemiological model of this invasive disease with an opinion dynamics model we are able to answer the question: What makes or breaks the effectiveness of a disease control campaign? Frequent contact between stakeholders and advisors is shown to increase the probability of successful control. More surprisingly, we show that informing stakeholders about the effectiveness of control methods is of much greater importance than prematurely increasing their perceptions of the risk of infection. We discuss the overarching consequences of this finding and the effect on human as well as plant disease epidemics.

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Orchard and nursery dynamics of the effect of interplanting citrus with guava for huanglongbing, vector, and disease management

Cited by 23 publications

References 22 publications

Repellency of selected Psidium guajava cultivars to the Asian citrus psyllid, Diaphorina citri

Repellency of selected Psidium guajava cultivars to the Asian citrus psyllid, Diaphorina citri

Mathematical models are a powerful method to understand and control the spread of Huanglongbing

What makes or breaks a campaign to stop an invading plant pathogen?

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