CandidatusLiberibacter asiaticus (Las) has been reported to increase the susceptibility of theAsian citrus psyllid,Diaphorina citriKuwayama (Hemiptera: Psyllidae), to selected insecticides. Reduced general esterase activity in Las-infected, compared with uninfected, D. citri has been proposed as a possible explanation for this difference in insecticide susceptibility. The current study was cond...

Introduetion Apple proliferation (AP) is one of the most economically important phytoplasmal diseases in Europe. It seriously impairs fruit size, yield, and vigor of the trees. AP was first reported in northern Italy (Rui et al., 1950). In the following decades, the occurrence of AP was reported from most European countries. Due to its transmissibility by grafting, the disease was initially tho...

Diaphorina citri (Hemiptera: Psyllidae), the Asian citrus psyllid, is the insect vector of Ca. Liberibacter asiaticus, the causal agent of citrus greening disease. Sequencing of the D. citri metagenome has been initiated to gain better understanding of the biology of this organism and the potential roles of its bacterial endosymbionts. To corroborate candidate endosymbionts previously identifie...

Studies were conducted to investigate the effects of a kaolin-based hydrophilic particle film, Surround WP, on the biology and behavior of the psyllid Diaphorina citri Kuwayama (Hemiptera: Psyllidae) and to assess population densities of D. citri in citrus subjected to monthly applications of Surround WP. Laboratory investigations indicated a 3% (wt:vol) suspension of Surround WP in water appli...

the purpose of this work was to study the population dynamics of Diaphorina citri Kuwayama (Hemiptera: Psyllidae) in orchards of ‘Valencia’ orange, ‘Ponkan’ mandarin, and ‘murcott’ tangor trees located at the são José farm in the municipality of taquaritinga, são Paulo (sP). yellow sticky traps used to monitor this disease vector were evaluated monthly for 4 yr between sep 2004 and aug 2008. th...

The principal means of dissemination of phytoplasmas is by insect vectors. The interactions between phytoplasmas and their insect vectors are, in some cases, very specific, as is suggested by the complex sequence of events that has to take place and the complex form of recognition that this entails between the two species. The commonest vectors, or at least those best known, are members of the ...

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 me...

Large-scale monitoring programmes often make inferences about insect abundance based on count data collected using some probability-based sampling technique. Unfortunately, it is rather difficult to obtain reliable estimates of insect abundance from count data unless the scale is very fine or localized. A major issue, that has to be explicitly addressed when estimating insect abundance, is the ...