Evaluation of six different groups of insecticides for the control of citrus psylla Diaphorina citri Hemiptera : Psyllidae. Directory of Open Access Journals Sweden. Six insecticides viz. After first spray overall mean population of D. Similarly, after the second spray of each of the same insecticides the population of D. Where in controls there were
|Country:||Trinidad & Tobago|
|Published (Last):||15 March 2006|
|PDF File Size:||3.92 Mb|
|ePub File Size:||13.59 Mb|
|Price:||Free* [*Free Regsitration Required]|
Evaluation of six different groups of insecticides for the control of citrus psylla Diaphorina citri Hemiptera : Psyllidae. Directory of Open Access Journals Sweden. Six insecticides viz. After first spray overall mean population of D. Similarly, after the second spray of each of the same insecticides the population of D. Where in controls there were Percent decrease of D. After the second spray percent decrease over control recorded was highest in Actara 25 WG Pear psylla , Cacopsylla pyricola Hemiptera : Psyllidae , is a key pest of pear and is a vector of "Candidatus Phytoplasma pyri", the pathogen associated with pear decline disease.
Although commercial pear trees are grafted to Phytoplasma-resistant rootstock, a recent report indicated that many C. The complete mitochondrial genome sequence of Diaphorina citri Hemiptera : Psyllidae.
The first complete mitochondrial genome mitogenome sequence of Asian citrus psyllid, Diaphorina citri Hemiptera : Psyllidae , from Guangzhou, China is presented. Pear transformed with a lytic peptide gene for disease control affects nontarget organism, pear psylla Homoptera: Psyllidae. The biology and behavior of pear psylla , Cacopsylla pyricola Foerster, on a transgenic clone of 'Bartlett' pear, Pyrus communis L. The gene construct also contained the marker gene nptII aminoglycoside 3'-phosphotransferase II that encodes for antibiotic resistance to identify transformed plants.
The purpose of the original transformation was to enhance pear resistance to the bacterial disease fireblight caused by Erwinia amylovora Burr. Winslow et al. The biology and behavior of pear psylla on a transgenic clone were compared with a nontransgenic parental pear clone in short- crops.
Because the species is thought to feed exclusively on Albizia, it may prove to be an effective biocontrol agent against the invasive Albizia julibrissin Durazzini in the southeastern United States.
Because A. We used two methods, namely fluorescence in situ hybridization and quantitative polymerase chain reaction qPCR , to estimate relative abundance of Carsonella in bacteriocytes and whole bodies of psyllids, respectively. Using these two methods, we compared Carsonella populations between female and male insects. Estimations using fluorescence in situ hybridization indicated that Carsonella was more abundant in bacteriocytes of female C. Analyses by qPCR using whole-body specimens indicated Carsonella was more abundant in females than in males of both psyllids.
Using fluorescence in situ hybridization, Carsonella was observed in ovarioles of newly emerged females and formed an aggregation in the posterior end of mature oocytes. Results of our study indicate that female psyllids harbor greater populations of Carsonella than do males and that sex should be controlled for in studies which require estimations of Carsonella populations.
Psyllids were found in high numbers in citrus Citrus spp. To the best of our knowledge, this is the first report of D. Full Text Available Glycaspis brimblecombei Moore, is a psyllid Hemiptera : Psyllidae pest of Eucalyptus, native toAustralia and first recorded in Europe: Spain in and more recently in Italy. The present paper dealswith recent research, carried out in central Italy, with new data on the distribution and biology of this species.
Acizzia solanicola Hemiptera : Psyllidae probing behaviour on two Solanum spp. Piercing-sucking insects are vectors of plant pathogens, and an understanding of their feeding behaviour is crucial for studies on insect population dynamics and pathogen spread. This study examines probing behaviour of the eggplant psyllid, Acizzia solanicola Hemiptera : Psyllidae , using the electrical penetration graph EPG technique, on two widespread and common hosts: eggplant Solanum melongena and tobacco bush S.
Six EPG waveforms were observed: waveform NP non-probing phase , waveform C pathway phase , G feeding activities in xylem tissues , D first contact with phloem tissues , E1 salivation in the sieve elements and E2 ingestion from phloem tissues. Results showed that A. Feeding was enhanced on eggplant compared to tobacco bush which showed some degree of resistance, as evidenced by shorter periods of phloem ingestion, a higher propensity to return to the pathway phase once in the sieve elements and higher number of salivation events on tobacco bush.
We discuss how prolonged phloem feeding could indicate the potential for A. Intercropping can reduce agricultural pest incidence, and represents an important sustainable alternative to conventional pest control methods. Understanding the ecological mechanisms for intercropping could help optimize its use, particularly in tropical systems which present a large number of intercropping possibilities.
Citrus is threatened worldwide by greening disease huanglongbing, HLB vectored by the Asian citrus psyllid, Diaphorina citri Kuwayama Hemiptera : Psyllidae. Control of HLB and citrus psyllid can be partially achieved through intercropping with guava, Psidium guajava L.
We tested the hypothesis that guava olfactory cues affect psyllid behavior by altering the attractiveness of citrus through plant-plant interactions. In choice and no-choice cage experiments, psyllid settlement was reduced on citrus shoots that had been exposed to guava shoot odors for at least 2 h.
In Y-tube olfactometer experiments, psyllids oriented to odors of unexposed, compared with guava-exposed, citrus shoots. These behavioral results indicate that a mechanism for the success of guava intercropping for sustainable, ecological disease management may be the indirect effect of guava on citrus attractiveness.
All rights reserved. For Permissions, please email: journals. Morphogenesis of galls induced by Baccharopelma dracunculifoliae Hemiptera : Psyllidae on Baccharis dracunculifolia Asteraceae leaves.
Full Text Available The commonest insect gall on Baccharis dracunculifolia Asteraceae leaves is induced by Baccharopelma dracunculifoliae Hemiptera , Psyllidae. The gall-inducing insect attacks young leaves in both the unfolded and the fully expanded stages.
Four developmental phases were observed in this type of gall: 1 A folding phase, during which the leaf lamina folded upward alongside the midrib and the edges of the upper portion of the leaf approached each other, forming a longitudinal slit. A single chamber was formed on the adaxial surface of the leaf; 2 A swelling phase, in which the folded leaf tissues thickened and the edges of the leaf drew closer together, narrowing the slit.
In this phase the gall matured, turning succulent, fusiform and pale green. The single nymphal chamber was lined with white wax and was able to house from one to several nymphs; 3 A dehiscence phase, characterized by the opening of the slit to release inducers; and 4 A senescence phase, when the gall turned dark and dry. The dermal system of the mature gall was composed of a single-layered epidermis.
The mesophyll was swollen, and the swelling was due mainly to hyperplasia of the parenchyma. The vascular tissues along the midrib vein were conspicuous and the perivascular fibers resembled parenchymal cells. The hypertrophied secretory cavities contained low lipophylic content.
This gall does not form nutritive tissue, but salivary sheaths left by the inducers were observed near the parenchyma, vascular bundles and secretory cavities. This study complements our current knowledge of gall biology and sheds further light on the plasticity of plant tissues stimulated by biotic factors. Dispersion patterns and sampling plans for Diaphorina citri Hemiptera : Psyllidae in citrus.
The abundance and spatial dispersion of Diaphorina citri Kuwayama Hemiptera : Psyllidae were studied in 34 grapefruit Citrus paradisi Macfad. Osbeck] orchards from March to August when the pest is more abundant in southern Texas. Although flush shoot infestation levels did not vary with host plant species, densities of D.
The spatial distribution of D. Taylor's power law fitted the data better than Iowa's model. Based on both regression models, the field dispersion patterns of D. For the average density of each life stage obtained during our surveys, the minimum number of flush shoots per tree needed to estimate D.
Projections indicated that a sampling plan consisting of 10 trees and eight flush shoots per tree would provide density estimates of the three developmental stages of D. A presence-absence sampling plan with a fixed precision level was developed and can be used to provide a quick estimation of D. The authority and types for the hackberry gall psyllid genus Pachypsylla Riley Hemiptera -Homoptera: Psyllidae. The nomenclatural problems with the hackberry gall psyllid species names are rectified.
The genus Pachypsylla Riley, , type species, Psylla venusta Osten-Sacken, includes 14 nominal species. These are: Pachypsylla venusta Osten-Sacken, ; P. The effects of host, geographic origin, and gender on the thermal requirements of Diaphorina citri Hemiptera : Psyllidae.
Diaphorina citri Kuwayama Hemiptera : Psyllidae is the vector of the bacteria that causes citrus greening and is considered one of the world's most important citrus diseases.
We examined how host, geographic region, and gender affect the thermal requirements of D. Host plants for D. To study the influence of geographic origin on thermal requirements, we studied D. The duration and survival of the development stages and the duration of the total development egg-adult did not differ significantly on the different hosts, but it did vary with temperature. Nymphs of D. The thermal requirements for this species collected from the two climate regions were identical; males and females also had the same thermal requirements.
Description of the male of Psyllaephagus euphyllurae Masi Hymenoptera, Encyrtidae, a parasitoid of the olive psylla , Euphyllura olivina Costa Hemiptera , Liviidae, with notes on its reproductive traits and hyperparasitoids. Full Text Available A colony of the encyrtid wasp Psyllaephagus euphyllurae Masi Hymenoptera, Encyrtidae has been established in the quarantine laboratory at the University of California, Riverside, California, USA as part of a classical biological control program against its invasive host, the olive psylla , Euphyllura olivina Costa Hemiptera , Psylloidea, Liviidae, an important pest of olives in some parts of the world.
The colony originators were reared from the same host found on abandoned, commercial olives in Catalonia, Spain; additional collections were made in Murcia. The parasitoid reproduces primarily by thelytoky; however, a few occasional males have been found in the field in Spain, but not in colonies reared under quarantine or laboratory conditions.
Here, the female of P. A lectotype is designated for Encyrtus euphyllurae Masi. Information is given on the results of genetic matching between the two sexes of the parasitoid and also on the presence of the bacterial Wolbachia symbiont that apparently is affecting reproduction of this species, including its sex ratio in the field.
Two species of hyperparasitoids have also emerged from the parasitized olive psylla nymphs from Catalonia: numerous specimens of Apocharips trapezoidea Hartig Hymenoptera, Figitidae and one specimen of a Pachyneuron sp. Hymenoptera, Pteromalidae. Full Text Available Diaphorina citri Kuwayama Hemiptera : Psyllidae is the vector of citrus greening Huanglongbing bacterium and the most serious impediment to citrus culture.
Classical biological control of this psyllid vector should contribute to suppress their population. This research was conducted to determine the performance of Menochilus sexmaculatus Fabricius Coleoptera: Coccinellidae when they were fed with D. The larval performance index of M. Employing the exclusion procedure under field condition,M. These findings showed that theM. Diaphorina citri Kuwayama Hemiptera : Psyllidae merupakan kelompok Psyllid yang menularkan penyebab penyakit Huanglongbing yang sangat berbahaya pada tanaman jeruk.
Pengendalian hayati klasik telah banyak memberikan kontribusi dalam pengendalian di lapangan.
Le psille propriamente dette Psyllidae Latreille , sono una famiglia cosmopolita di insetti dell' ordine dei Rincoti Omotteri , superfamiglia Psylloidea. Sono insetti di piccole dimensioni, alati, con capo largo quanto il torace. Il capo porta antenne di 10 articoli, provvisto di occhi e di tre ocelli. Le ali sono membranose, quelle anteriori leggermente sclerificate. La seconda, detta vena basale , si dirama ben presto in due biforcazioni.
Psyllidae pachysylla species. Hackberry Psyllid - Pachysylla sp. Integrated Taxonomic Information System. Commons category. French Wikipedia.