This research aimed at studing Telenomus remus Nixon biology reared on Spodoptera frugiperda (J.E. Smith) eggs at different temperatures. Based on the development of the cycle (egg-adult), the thermal requirements and the number (154.12 degree-days and 12.6ºC). The estimated number of T. remus generation per year for males and females at laboratory conditions was 5. 6 and 5.6, 16.9 and 17.3, 28.3 and 29.0, 35.1 and 36.0, 39.6 and 40.7 at 15, 20, 25, 28, and (154,12 graus dias e 12,59ºC). A estimativa do número de gerações anuais para T. remus para machos e fêmeas em condições de laboratório foi respectivamente 5,6 e 5,6; 16,9 e 17,3; 28,3 e 29,0; 35,1 e 36,0; 39,6 e 40,7 nas temperaturas de 15, 20, 25, 28
(18, 20, 22, 25, 30, 32°C), 70±10% RU and photophase of 14 hours, with the aim of determining the thermal requirements and the number of generations during the year. There was an inverse correlation between the duration of the cycle and the increase of temperature in the thermal zone studied. Nevertheless, the sexual ratio was not affected by the temperature when the host was T. absoluta. The viability of T. pretiosum, reared in P. operculella, was more affected than in T. absoluta. The thermal requirement, calculated by the hyperbole was higher for T. absoluta (131.3 degrees day) in relation to P. operculella (120.9 degrees day), and the thermal threshold was lesser respectively, 12.98
Selection of Strains of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) to Control the Tomato Leafminer Moths Tuta absoluta (Meyrick) and Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae) ABSTRACT-The biological aspects and the parasitism of six strains of Trichogramma pretiosum Riley reared on eggs of tomato moths Tuta absoluta (Meyrick) and Phthorimaea operculella (Zeller) were studied in order to select those with best biological features and more aggressive to control such pests. Life cycle, viability, sexual ratio and parasitism percentage were similar among the six strains studied regarding the parasitism of T. absoluta eggs. In P. operculella eggs, strains L1, L4 and L6 were more aggressive. Based on the cluster analysis, strains L1, L2, L4 and L5 had similar behavior when reared on T. absoluta eggs. For P. operculella, similarities were observed among strains L1, L3, L4 and L6. Considering the desirable biological characteristics, that is, higher parasitism, shorter life cycle, higher viability and predominance of females, strains L1 and L4 are more suitable for tomato moths.
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