Biological characteristics of the egg phase of citrus root weevils

Publication Type:Journal Article
:2007
Authors:J. V. C. Guedes, Parra J. R. P.
Journal:Neotropical Entomology
Volume:36
Pagination:192-196
Date Published:March-April
:1519-566X
:Naupactus cervinus, Naupactus versatilis, Parapantomorus fluctuosus
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The goal of this work was to study some characteristics of the egg phase of three species of citrus root weevils. The insects were collected from citrus plants in Itapetininga, SP, and brought to the Laboratorio de Biologia de Insetos of ESALQ/USP, in Piracicaba, SP, where the species Naupactus cervinus (Boheman), Naupactus versatilis (Hustache) and Parapantomorus fluctuosus (Boheman) were kept. Duration and viability of the egg phase were evaluated, and the lower temperature threshold and thermal constant (K) were calculated for these species. The species of citrus root weevils showed different duration of egg phases. The egg phase ranged from 40.4 to 13.8 N. cervinus, from 38.7 to 20.0 days for N. versatilis, and from 35.0 to 13.8 days for P. fluctuosus, depending upon temperature. The temperature thresholds of this stage were 8. 1, 8.3, and 9.9[degree]C at thermal constant was 385.7, 397.7 and 294.1 degree-days, for N. cervinus, N versatilis and P fluctuosus respectively. The duration of the egg phases of N. cervinus and N. versatilis were similar at the same temperatures and P. fluctuosus had a faster development than Naupactus spp. in all temperatures tested.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith