Egg Brochosomes of Proconiini (Hemiptera: Cicadellidae, Cicadellinae) species associated with cultivation of grapevines

Filho, Wilson Sampaio de Azevedo; Botton, Marcos; Paladini, Andressa; Carvalho, Gervásio Silva; Ringenberg, Rudiney; Lopes, João Roberto Spotti

doi:10.1590/s0103-90162008000200015

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…Al-Wahaibi (2004), based on work by Hix (2001) and Rakitov (2000Rakitov ( , 2002Rakitov ( , 2004, outlined a compound microscope method for differentiating the two species using the shape of the brochosomes deposited by females on the surface of egg masses. De Azevedo Filho and Carvalho (2005) and De Azevedo Filho et al (2008) used variation in the morphology of brochosomes (discerned using scanning electron microscopy) to produce keys to differentiate among seven and eight species of Proconiini leafhoppers occurring, respectively, on citrus and grape vines in Brazil, respectively. Other promising methodologies to identify Homalodisca eggs to species include immunological assays such as enzyme-linked immunosorbent assay (Hagler et al 2002(Hagler et al , 2003 and electrophoretic enzyme techniques such as esterase proÞling (Toscano et al 2003, Byrne andToscano 2006).…”

Section: Discussionmentioning

confidence: 99%

Egg Stage of Homalodisca vitripennis and Homalodisca liturata (Hemiptera: Cicadellidae): Ovometrics, Embryonic Development, and Nonparasitic Mortality

Al‐Wahaibi

Morse

2009

Annals of the Entomological Society of America

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Morphometric and developmental aspects of the egg stage of glassy-winged sharpshooter, Homalodisca vitripennis (Germar), and Homalodisca liturata Ball were investigated. Considerable overlap exists between the two species with respect to egg length, width, and clutch size, making these variables unreliable in identifying their eggs to species. Embryonic development of the two species was observed at constant temperatures ranging from 8.7 to 40.4°C. No signs of development were observed at 8.7°C, development was aborted early in development at 11.5°C, and egg masses were desiccated at 40.4°C. For both species, rates of embryonic development increased linearly with increasing temperatures from 16.7 to 25.6°C, peaked at 31.2°C, and decreased between 32.9 and 35.0°C. Based on linear regression, the minimum thresholds for embryonic development were 12.0 and 12.6°C, and heat unit requirements were 111.4 and 104.5 degree-days for H. vitripennis and H. liturata, respectively. We quantified four physiological states of embryonic development, based on eye spots being normally developed, centrally developed, reversed, or undeveloped. The prevalence of these states did not differ significantly between the two species and comparing data from the laboratory versus the field. However, higher experimental temperatures tended to increase the prevalence of abnormally developed eye spots. Nonparasitic mortality of Homalodisca eggs in five field host plants was attributed to undeveloped-abnormally developed embryos and to the inability of first-instar nymphs to emerge from eggs. These causes of mortality varied among host plants. Eggs on mule fat tended to have a higher proportion of undeveloped-abnormally developed eggs, whereas on jojoba, Simmondsia chinensis (Link) Schneider, a higher prevalence of dead but fully developed embryos was observed inside eggs.

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Section: Discussionmentioning

confidence: 99%

Egg Stage of Homalodisca vitripennis and Homalodisca liturata (Hemiptera: Cicadellidae): Ovometrics, Embryonic Development, and Nonparasitic Mortality

Al‐Wahaibi

Morse

2009

Annals of the Entomological Society of America

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“…a) display remarkable interspecific diversity and can be used for taxonomic identification of eggs (De Azevedo Filho et al . ; Rakitov ).…”

Section: Environmental Factors Influencing Vector Population Densitiesmentioning

confidence: 99%

Sharpshooters: a review of what moves Xylella fastidiosa

et al. 2019

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Sharpshooters (Hemiptera: Cicadellidae: Cicadellinae) and spittlebugs (Hemiptera: Aphrophoridae: Aphrophorinae) have a worldwide distribution and are often associated with many crops. Because the geographic range of sharpshooters and spittlebugs often overlaps with the range of the plant pathogenic bacterium Xylella fastidiosa, the importance of these groups of insects in spreading X. fastidiosa rises to the level of a major socioeconomic problem. Managing diseases caused by X. fastidiosa is challenging for several reasons. First, multiple sequence types of the pathogen have been identified, with sequence type affecting host plant specificity. Second, multiple vector species may be present in an agroecosystem, and the host range of vector species is often broad. Although multiple vector control options such as biological, chemical, physical and cultural controls have been described, disease control programs must take into account biological and ecological parameters of locally dominant X. fastidiosa sequence types and vector species to develop suitable control strategies. Our review demonstrates how fundamental principles of vector reproductive biology, behaviour, nutrition and population and community ecology have influenced research on insect vectors and provides insights into priority research areas.

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“…The brochosomes covering is supposed to protect the egg masses against parasitoids, predators, and pathogens and create optimal conditions for their development [71,72,77]. Egg brochosomes, considering their unique species-specific features, are suggested as helpful identification keys for some Proconiine species in Citrus sinensis (Linnaeus) Osbeck, 1765 (Rutaceae) orchards [76] and in vineyards [78], where these pests can be vectors of the dangerous bacterium Xylella fastidiosa (Xanthomonadaceae).…”

Section: Brochosomesmentioning

confidence: 99%

Multiple Functions of Malpighian Tubules in Insects: A Review

Farina

Bedini

Conti

2022

Insects

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The Malpighian Tubules (MTs) are the main excretory organs in most insects. They play a key role in the production of primary urine and osmoregulation, selectively reabsorbing water, ions, and solutes. Besides these functions conserved in most insects, MTs can serve some specialized tasks at different stages of some species’ development. The specialized functions include the synthesis of mucopolysaccharides and proteins for the building of foam nests, mucofibrils for the construction of dwelling tubes, adhesive secretions to help the locomotion, and brochosomes for protection as well as the usage of inorganic salts to harden the puparia, eggs chorion, and pupal cells’ closing lids. MTs are also the organs responsible for the astonishing bioluminescence of some Diptera glowworms and can go through some drastic histological changes to produce a silk-like fiber utilized to spin cocoons. The specialized functions are associated with modifications of cells within the entire tubules, in specific segments, or, more rarely, modified secretory cells scattered along the MTs. In this review, we attempted to summarize the observations and experiments made over more than a century concerning the non-excretive functions of insects’ MTs, underlying the need for new investigations supported by the current, advanced technologies available to validate outdated theories and clarify some dubious aspects.

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Egg Brochosomes of Proconiini (Hemiptera: Cicadellidae, Cicadellinae) species associated with cultivation of grapevines

Cited by 6 publications

References 9 publications

Egg Stage of Homalodisca vitripennis and Homalodisca liturata (Hemiptera: Cicadellidae): Ovometrics, Embryonic Development, and Nonparasitic Mortality

Egg Stage of Homalodisca vitripennis and Homalodisca liturata (Hemiptera: Cicadellidae): Ovometrics, Embryonic Development, and Nonparasitic Mortality

Sharpshooters: a review of what moves Xylella fastidiosa

Multiple Functions of Malpighian Tubules in Insects: A Review

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