Limited efficacy of guava interplanting on citrus greening disease: Effectiveness of protection against disease invasion breaks down after one year

Ichinose, Katsuya; Hòa, Nguyễn Văn; Bang, Doan Van; Tuan, Do Hong; Dien, Le Quoc

doi:10.1016/j.cropro.2011.11.023

Cited by 24 publications

(19 citation statements)

References 28 publications

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“…In a previous study, when neonicotinoids or organophosphates were applied on grown citrus trees aged ≥two years by leaf spraying, soil drenching, or trunk painting, long residual effects could not be observed [70,71] : only leaf spray could reduce the psyllid population for a maximum of one to two weeks. These results correspond to those obtained in the subtropics of Japan [54] . The timing of two insecticide applications should be changed as trees grow older.…”

Section: B Effective Use Of Insecticidessupporting

confidence: 91%

“…Interplanted crops interfere with the search of pests for appropriate hosts in various ways: they produce substances that are repellent to the pest species or facilitate predatory species to maintain their population when the prey does not exist in sufficient quantities on the primary crop [53] . The use of guava interplanting for CG management has recently been reported [54] . This topic is referred to later in this review.…”

Section: Prevention Of Vector Invasion: Windbreak and Interplantingmentioning

confidence: 99%

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Asian Citrus Greening and Assessment of Current Techniques for Reducing Disease Occurrences

Iwanami¹,

Tuan²,

Ichinose

et al. 2013

JASA

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Asian citrus greening (hereafter, CG) is an incurable disastrous disease of citrus, caused by the pathogen "Candidatus Liberibacter asiaticus" in Asia, USA, and Brazil. This pathogen is transmitted by the citrus psyllid Diaphorina citri in these countries, and trees, once infected, die within several years. Psyllids that acquire the pathogen in their fourth or fifth instar transmit it most successfully. Since no bactericides are available for sustainable management of CG, current CG management techniques depend mainly on the control of the vector by insecticides. Monthly or every-twomonth application of neonicotinoids is perceived to be the most effective technique for vector control. Cultivational measures for CG control have also been investigated. Recently, guava interplanting has been found to be more effective on CG for about one and a half years after planting, during which it prevents CG invasion almost completely. The efficacy of guavainterplanting would be overcome by that of insecticide control in three years, though. In orchards surrounding or located in areas with dominant prevalence of CG, insufficient or inappropriate vector control allows invasion of psyllids into the orchards, resulting in severe infection of the trees with CG. None of the current management techniques can completely prevent psyllid invasion. Thus, regardless of the management programs that may be undertaken, CG expansion is inevitable. Irrespective of the knowledge accumulated on CG in the past decades, the extent to which individual management techniques can contribute to reduce CG remains unclear. Here, we review the management techniques for CG and attempt to evaluate the efficiency of individual techniques in reducing CG occurrence.

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Section: B Effective Use Of Insecticidessupporting

confidence: 91%

Section: Prevention Of Vector Invasion: Windbreak and Interplantingmentioning

confidence: 99%

Asian Citrus Greening and Assessment of Current Techniques for Reducing Disease Occurrences

Iwanami¹,

Tuan²,

Ichinose

et al. 2013

JASA

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“…In each of the two experiments, newly planted citrus largely remained free of ACP infestations for the first several months after planting regardless of the psyllid management program. Other researchers have reported that ACP may be slow to find and infest new young citrus plants (for example, Ichinose et al, 2012;Leong et al, 2012). A newly planted tree may be too small for ACP to recognize visually as a host plant or may produce insufficient plant volatiles that attract ACP.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Management Programs for Protecting Young Citrus Plantings from Huanglongbing

Hall¹,

Gottwald²,

Stover³

et al. 2013

horts

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Asiatic huanglongbing (HLB) is a devastating disease of citrus associated in North America with the bacterium 'Candidatus Liberibacter asiaticus' (LAS) vectored by the Asian citrus psyllid (ACP), Diaphorina citri Kuwayama. ACP management is considered a vital component of a program aimed at reducing the incidence and spread of HLB. Considerable research has been published comparing the efficacy of different insecticides for ACP control as well as on seasonal strategies for applying ACP insecticides. However, published information was largely lacking for even the most intense insecticide programs on their effectiveness for keeping HLB out of a new citrus planting in Florida citrus. We therefore conducted two replicated (individual plots 0.2 to 0.4 ha in size) experiments on protecting young citrus from HLB using different ACP management programs. An intensive insecticide program was evaluated in each experiment: eight annual calendar applications of traditional insecticides (hereafter referred to as the ''complete'' program). In one experiment, citrus was either planted alone and subjected to the complete program or citrus was interplanted with orange jasmine, Murraya exotica L. (a favored ACP host plant) and subjected to a reduced insecticide program (four calendar sprays of traditional insecticides). There was one set of plots in which both jasmine and citrus were treated with insecticides and one set in which jasmine was not treated at all. In the second experiment, citrus was either subjected to the complete program or to one of two other programs: a reduced insecticide program consisting of five calendar applications of traditional insecticides or a mineral oil program (oil applications every 3 weeks plus one dormant insecticide spray). The results of the two experiments were similar. Relatively good ACP control was achieved under each ACP management program during the first year but, as the experiments progressed and trees increased in size, ACP outbreaks occurred regardless of the psyllid management program. Little HLB developed under any ACP management program during the first year, but thereafter HLB increased and large percentages of the trees in each experiment became LAS-infected in less than two to three years. The combined results of the experiments indicated that up to eight monthly pesticide treatments per year applied on a calendar schedule were ineffective for preventing young citrus from becoming diseased. Of important significance is that the orchard within which the two experiments were conducted was subjected to a minimal psyllid management program and contained many older trees known to be infected by the HLB pathogen, a challenging situation for getting young trees into production without contracting the disease. Thus, the ACP management programs we evaluated might have been more effective if ACP in the surrounding areas had been more aggressively controlled and diseased trees in the surrounding areas removed to reduce inoculum loads. Also, the programs might have been more effective for sl...

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“…Although the protective benefits of guava interplanting, appear to decay with time (Ichinose et al. ), the repellent volatiles have been identified (Onagbola et al. ), and the possibility exists to integrate these within a broader management strategy that might employ other repellent compounds (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…For example, foliage of guava, Psidium guajava L. (Myrtaceae) is known to repel adult D. citri (Zaka et al 2010) and has been proposed for interplanting with citrus. Although the protective benefits of guava interplanting, appear to decay with time (Ichinose et al 2012), the repellent volatiles have been identified (Onagbola et al 2011), and the possibility exists to integrate these within a broader management strategy that might employ other repellent compounds (e.g. Poerwanto et al 2012) or selected attraction cues to create 'push-pull' tactics effective in deterring psyllid colonization of citrus.…”

Section: Discussionmentioning

confidence: 99%

Sex‐specific responses of Asian citrus psyllid to volatiles of conspecific and host‐plant origin

Gharaei

Ziaaddini

Jalali

et al. 2013

J Applied Entomology

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Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is the primary vector of Candidatus Liberibacter spp. bacteria that cause citrus greening, a disease of worldwide importance. Olfactometry was employed to test responses of D. citri to odours from intact citrus plants (Mexican lime, Citrus aurantifolia, sour orange, Citrus aurantium, Marsh grapefruit, Citrus paradisi and Valencia orange, Citrus sinensis), citrus plants previously infested with D. citri, and odours of conspecifics including nymphs, adult insects of same and opposite sex, and their products (honeydew), both alone and in combination. In contrast to other studies, psyllids of both sexes were attracted to volatiles of undamaged Mexican lime leaves, whereas undamaged grapefruit attracted only females, and leaves of Valencia and sour orange did not attract either sex. All four plant species attracted female psyllids when previously infested, but only Mexican lime and sour orange-attracted males. Thus, Citrus species appear to vary in the production of both constituitive and induced volatiles that attract adult psyllids. Volatiles emitted by nymphs did not attract either sex, but psyllid honeydew was attractive to males, likely due to female pheromone residues. Males oriented to the odour of females, whereas the reverse was not true, and neither males nor females oriented to samesex volatiles. The addition of conspecific cues (adults, nymphs or honeydew) did not increase female attraction to previously infested leaves, but male response was increased by the presence of adults and honeydew, regardless of plant species. Thus, female psyllids appear to orient more strongly to volatiles of plant origin, whereas males respond more strongly to cues emanating from females and conspecific excretions. These results suggest that female psyllids drive the initial colonization of host plants, whereas males orient to females and infested plants. Identification of the specific volatiles involved may permit their use in monitoring and management of this pest.

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Limited efficacy of guava interplanting on citrus greening disease: Effectiveness of protection against disease invasion breaks down after one year

Cited by 24 publications

References 28 publications

Asian Citrus Greening and Assessment of Current Techniques for Reducing Disease Occurrences

Asian Citrus Greening and Assessment of Current Techniques for Reducing Disease Occurrences

Evaluation of Management Programs for Protecting Young Citrus Plantings from Huanglongbing

Sex‐specific responses of Asian citrus psyllid to volatiles of conspecific and host‐plant origin

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