The coconut pathosystem: weed hosts of nymphs of the American palm Cixiid<i>Haplaxius crudus</i>(Hemiptera: Fulgoroidea)

Hernández, Eder Ramos; Alejandro, Miguel Alberto Magaña; Ortiz-García, Carlos Fredy; Oropeza-Salín, Carlos; Gordillo, Julia María Lesher; Soto, Saúl Sánchez

doi:10.1080/00222933.2017.1420832

Cited by 8 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Regarding alternative plant hosts for palm phytoplasmas, Bahder et al (66) present the hypothesis that “ Ca . Phytoplasma palmae” (group 16SrIV) could have been introduced in one plot in Florida by the planting of St. Augusta grass, on which Haplaxus crudus , identified as an insect vector of this phytoplasma, could achieve part of its life cycle as it does on many grasses (67). Studies are conflicting about possible “ Ca .…”

Section: Discussionmentioning

confidence: 99%

Multilocus Sequence Analysis Reveals Three Distinct Populations of “ Candidatus Phytoplasma palmicola” with a Specific Geographical Distribution on the African Continent

Pilet

Quaicoe

Osagie

et al. 2019

Appl Environ Microbiol

View full text Add to dashboard Cite

To sustain epidemiological studies on coconut lethal yellowing disease (CLYD), a devastating disease in Africa caused by a phytoplasma, we developed a multilocus sequence typing (MLST) scheme for “CandidatusPhytoplasma palmicola” based on eight housekeeping genes. At the continental level, eight different sequence types were identified among 132 “CandidatusPhytoplasma palmicola”-infected coconuts collected in Ghana, Nigeria, and Mozambique, where CLYD epidemics are still very active. “CandidatusPhytoplasma palmicola” appeared to be a bacterium that is subject to strong bottlenecks, reducing the fixation of positively selected beneficial mutations into the bacterial population. This phenomenon, as well as a limited plant host range, might explain the observed country-specific distribution of the eight haplotypes. As an alternative means to increase fitness, bacteria can also undergo genetic exchange; however, no evidence for such recombination events was found for “CandidatusPhytoplasma palmicola.” The implications for CLYD epidemiology and prophylactic control are discussed. The usefulness of seven housekeeping genes to investigate the genetic diversity in the genus “CandidatusPhytoplasma” is underlined.IMPORTANCECoconut is an important crop for both industry and small stakeholders in many intertropical countries. Phytoplasma-associated lethal yellowing-like diseases have become one of the major pests that limit coconut cultivation as they have emerged in different parts of the world. We developed a multilocus sequence typing scheme (MLST) for tracking epidemics of “Ca. Phytoplasma palmicola,” which is responsible for coconut lethal yellowing disease (CLYD) on the African continent. MLST analysis applied to diseased coconut samples collected in western and eastern African countries also showed the existence of three distinct populations of “Ca. Phytoplasma palmicola” with low intrapopulation diversity. The reasons for the observed strong geographic patterns remain to be established but could result from the lethality of CLYD and the dominance of short-distance insect-mediated transmission.

show abstract

Section: Discussionmentioning

confidence: 99%

Multilocus Sequence Analysis Reveals Three Distinct Populations of “ Candidatus Phytoplasma palmicola” with a Specific Geographical Distribution on the African Continent

Pilet

Quaicoe

Osagie

et al. 2019

Appl Environ Microbiol

View full text Add to dashboard Cite

show abstract

“…The adult H. crudus is a vector of the causative agent of lethal coconut yellowing (ALC), a highly destructive disease of coconut and ornamental palms in Florida and several countries in the Caribbean Basin region [1,3]. The lethal yellowing of the coconut palm is caused by the phytoplasma Candidatus Phytoplasma palmae, belonging to the group 16SrIV subgroup A [4,5]. Studies conducted by Cenipalma found that H. crudus is responsible for disseminating in palm plantations in Colombia, the pathogen causing Lethal Wilt (LW).…”

Section: Introductionmentioning

confidence: 99%

Population Parameters of Haplaxius crudus (Hemiptera: Cixiidae) under Semi-Controlled Conditions

Beltrán-Aldana,

Fernández-Sánchez,

Morales-Rodriguez

2024

Insects

View full text Add to dashboard Cite

The palm leafhopper, Haplaxius crudus, is a possible vector of the pathogen that causes the Lethal Wilt of oil palms in Colombia. This disease represents the biggest phytosanitary problem in the eastern palm zone. From 2010 to 2021, more than 7700 ha have been eradicated, with economic losses exceeding 154 million USD. Therefore, knowing the biology of this insect and its population parameters is necessary for developing population control tools. To evaluate these parameters, a cohort of 100 eggs obtained from H. crudus adults from the breeding unit established in the Campo Experimental Palmar de las Corocoras de Cenipalma in Paratebueno, Cundinamarca, was monitored to record the life cycle and the population parameters using a life table under semi-controlled conditions in an oil palm plantation. The life cycle from egg to adult was 62.7 ± 15.5 days (26.1 ± 2.9 °C; HR: 89.8 ± 14.0%). The egg stage lasted 14.6 ± 0.6 days, the nymphal stage 48.1 ± 2.8 days through five instars, and the adult longevity was 14.8 ± 8.4 days. The specific mortality rate (qx) calculated in the life table was 0.14 (for the egg stage), 0.05 (for I instar), 0.05 (for II instar), 0.03 (for III instar), 0.04 (for IV instar), and 0.07 (for V instar). The population parameters’ values were as follows: net reproductive rate Ro = 10.96; generation time T = 62.3 days, intrinsic natural growth rate rm = 0.03, and finite growth rate λ = 1.03. These results help us to understand the population dynamics of this insect in the field and for the development of population control studies.

show abstract

“…A sharp drop was found in the worldwide coconut productivity caused by the rapid spread of a disease termed Lethal Yellowing. The primary obstacles for controlling such disease are its rapid progress and high lethality, besides the lack of studies on the transmission (Ramos- Hernández et al, 2018). The first symptoms of the disease are the abortion of the fruits, followed by the blackened color, resulting in the reduction of seed viability.…”

Section: Introductionmentioning

confidence: 99%

Spatial Analysis and Population Dynamics of Haplaxius crudus (Hemiptera: Cixiidae) in Coconut Amazon

Bastos¹,

Santos²,

Penner³

et al. 2019

JAS

View full text Add to dashboard Cite

Haplaxius crudus is the primary vector of the phytoplasma that causes the Lethal Yellowing of Coconut, a disease that has become a barrier to the establishment of large coconut plantations in the world. The objective of this study was to determine the spatial distribution pattern and population dynamics of H. crudus adults by correlating them with the abiotic factors, such as temperature and rainfall in commercial dwarf coconut palm plantations. Collection of American palm cixiid was carried out using yellow sticky traps fixed to the abaxial part of the coconut leaves. The sampled plants were georeferenced to obtain the geographic coordinates and geostatistical analysis, besides the planialtimetric survey of the experimental plot for the preparation of the map that shows the topographic conformation of the terrain. Insects were found at the study site throughout the year, showing greater abundance in months when the average monthly temperatures and rainfall were not significant. The climatic factors showed a correlation with the total of insects, positive for the temperature, with 0.733 and negative for the precipitation with -0.606. The spatial distribution of H. crudus displayed an aggregate pattern, explained by the spherical model. The infestation focus occurred in the periphery of the plot, near a Brachiaria humidicola pasture. It was concluded that the infestation of the H. crudus showed a behavior directly related to the local climatic conditions and the aggregate spatial distribution explained by the spherical model, therefore, forming shrubs with a radius of 154 to 190 m, with areas of influence between 7.45 and 17.80 ha, which coincide with the lower part of the terrain.

show abstract

The coconut pathosystem: weed hosts of nymphs of the American palm CixiidHaplaxius crudus(Hemiptera: Fulgoroidea)

Cited by 8 publications

References 23 publications

Multilocus Sequence Analysis Reveals Three Distinct Populations of “ Candidatus Phytoplasma palmicola” with a Specific Geographical Distribution on the African Continent

Multilocus Sequence Analysis Reveals Three Distinct Populations of “ Candidatus Phytoplasma palmicola” with a Specific Geographical Distribution on the African Continent

Population Parameters of Haplaxius crudus (Hemiptera: Cixiidae) under Semi-Controlled Conditions

Spatial Analysis and Population Dynamics of Haplaxius crudus (Hemiptera: Cixiidae) in Coconut Amazon

Contact Info

Product

Resources

About