Guedes Jerson V C, Parra José R P
Depto. Defesa Fitossanitária, Univ. Federal de Santa Maria, Santa Maria, RS.
Neotrop Entomol. 2007 Mar-Apr;36(2):192-6. doi: 10.1590/s1519-566x2007000200004.
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 Laboratório 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 masculineC 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.
这项工作的目的是研究三种柑橘根象甲卵期的一些特征。这些昆虫采自圣保罗州伊塔佩蒂宁加的柑橘植株，然后被带到位于圣保罗州皮拉西卡巴的ESALQ/USP昆虫生物学实验室，在那里饲养了颈棱象甲（Naupactus cervinus (Boheman)）、多变棱象甲（Naupactus versatilis (Hustache)）和波动副瘤象甲（Parapantomorus fluctuosus (Boheman)）。评估了卵期的持续时间和活力，并计算了这些物种的低温阈值和热常数（K）。柑橘根象甲的不同物种表现出不同的卵期持续时间。根据温度不同，颈棱象甲的卵期为40.4至13.8天，多变棱象甲为38.7至20.0天，波动副瘤象甲为35.0至13.8天。该阶段的温度阈值分别为8.1、8.3和9.9摄氏度，颈棱象甲、多变棱象甲和波动副瘤象甲的热常数分别为385.7、397.7和294.1日度。在相同温度下，颈棱象甲和多变棱象甲的卵期持续时间相似，在所有测试温度下，波动副瘤象甲的发育速度都比棱象甲属物种快。
