| [occurrence of ctenarytaina eucalypti (maskell) (hemiptera: psyllidae) and its natural enemy psyllaephagus pilosus noyes (hymenoptera: encyrtidae) in eucalyptus globulus in the state of rio grande do sul, brazil]. | eucalyptus are hosts of several psyllid species. among them, ctenarytaina eucalypti (maskell) is considered the most harmful to eucalyptus globulus plantations. in brazil, this pest has been observed in the state of parana, and in 2005, it was found causing damage to plantations of e. globulus in arroio grande and piratini cities, rs. the monophagous endoparasitoid psyllaephagus pilosus noyes was also observed parasitizing nymphs of c. eucalypti. this parasitoid has been shown to be highly effic ... | 2010 | 20878008 |
| genome reduction and co-evolution between the primary and secondary bacterial symbionts of psyllids. | genome reduction in obligately intracellular bacteria is one of the most well-established patterns in the field of molecular evolution. in the extreme, many sap-feeding insects harbor nutritional symbionts with genomes that are so reduced that it is not clear how they perform basic cellular functions. for example, the primary symbiont of psyllids (carsonella) maintains one of the smallest and most at-rich bacterial genomes ever identified and has surprisingly lost many genes that are thought to ... | 2012 | 22821013 |
| specificity and sensitivity of plant odor-detecting olfactory sensory neurons in ctenarytaina eucalypti (sternorrhyncha: psyllidae). | the blue gum psyllid, ctenarytaina eucalypti (sternorrhyncha: psyllidae), is an economic threat to eucalyptus subgenus symphyomyrtus plantations worldwide. to date, no generally applicable control method is available and the potential for semiochemical-based monitoring or control methods has not yet been investigated. hence, we conducted the first study on the olfactory sense of c. eucalypti, investigating the specificity and sensitivity of its olfactory sensory neurons (osns) to host plant vola ... | 2013 | 23524066 |
| induction of defensive response in eucalyptus globulus plants and its persistence in vegetative propagation. | the expression of defensive compounds derived from secondary metabolism in plants of eucalyptus globulus labill, and the persistence of these in vegetative propagation was evaluated by gas chromatography with flame ionization (gc-fid) and mass spectrometry (ms). the plants were induced by attack from the insect ctenarytaina eucalypti ("blue gum psyllid") and by mechanical damage. defense responses were activated in plants for the different types of tested induction. we identified four defensive ... | 2013 | 23678820 |
| shoot feeding as a nutrient acquisition strategy in free-living psylloids. | shoot feeding by sucking insects is accepted as an adaptation to feeding where plant nutrients are most concentrated and/or of higher quality. psylloids are an important hemipteran taxon, most of which are free-living and comprise many shoot feeding species, whose nutritional ecology has been largely ignored. i conducted a longitudinal study of ctenarytaina eucalypti (maskell) and c. bipartita burckhardt et al. (aphalaridae) feeding on eucalypts to document how within-plant (ontogenic) variation ... | 2013 | 24194907 |
| the occurrence and abundance of two alien eucalypt psyllids in apple orchards. | the arrival of alien insects is frequently associated with the introduction of alien plants. two exotic psylloidea native to australia [ctenarytaina eucalypti (maskell, 1890) and ctenarytaina spatulata taylor, 1997] were recorded during a two-year survey in five apple orchards located in asturias, on the northern coast of spain. both species develop on eucalyptus, but our results suggest that the adults feed also on apple. | 2014 | 24307287 |
| visual acuity trade-offs and microhabitat-driven adaptation of searching behaviour in psyllids (hemiptera: psylloidea: aphalaridae). | insects have evolved morphological and physiological adaptations in response to selection pressures inherent to their ecology. consequently, visual performance and acuity often significantly vary between different insect species. whilst psychophysics has allowed for the accurate determination of visual acuity for some lepidoptera and hymenoptera, very little is known about other insect taxa that cannot be trained to positively respond to a given stimulus. in this study, we demonstrate that prior ... | 2015 | 25827835 |
| meiotic karyotypes in males of nineteen species of psylloidea (hemiptera) in the families psyllidae and triozidae. | meiotic karyotypes in males of 16 species (assigned to 9 genera and 7 subfamilies) ofthe family psyllidae and 3 species (assigned to 3 genera of the subfamily triozinae) of the family triozidae are described for the first time. the first data on the genus ligustrinia are presented. all the species were shown to exhibit the modal karyotype for psyllids, 2n = 24 + x, except bactericera nigricornis and arytainilla spartiophila, in which 2n = 24 + xy and 2n = 22 + x were found, respectively. the kar ... | 2007 | 17687931 |
| candidate insect vectors of apple proliferation in northwest spain. | the apple proliferation (ap) disease is spread mostly by two psyllids. each species plays a predominant role as ap vector that changes regionally. thus, there is an urgent need to identify the ap vectors in each region where the disease is present. this research aimed at identifying the psyllid community in apple orchards from asturias (nw spain) and studying their possible role in ap transmission. yellow sticky traps were used to monitor psyllid community in five cider-apple orchards during 2 y ... | 2016 | 27536523 |