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RIA. Revista de investigaciones agropecuarias

On-line version ISSN 1669-2314


LA ROSSA, F; VASICEK, A; LOPEZ, M  and  BAINOTTI, C. Respuesta biológica y poblacional de Schizaphis graminum (Rond.) (Hemiptera: Aphididae) sobre ocho cultivares de trigo (Triticum aestivum L.) en condiciones de laboratorio. RIA. Rev. investig. agropecu. [online]. 2014, vol.40, n.3, pp.281-289. ISSN 1669-2314.

The aphid, Schizaphis graminum (Rond.) is a key pest in cereal crops such as wheat in Argentina. The aim of this work was to analyze the biological and demographic response of the aphid on the wheat cultivars ACA 315, Baguette Premium 11, BioInta 1002, BioInta 2004, Buck Meteoro, LE 2330, Klein Yarará and Colibrí, the last one a priori recognized as susceptible. The bioassays were carried out in a growth chamber at 20 ± 1°C, 70% RH and 14:10 h L:D cycle. Seedlings of 3 true leaves, in plastic pots with sterile soil were used. On leaves, females were placed individually into clip cages to produce nymphs during 24 h. After this, all individuals were removed, leaving only one, newborn; thus, cohorts of 40 coetaneous nymphs for each cultivar totalizing 320 initial aphids. Survivorship, instar changes and number of offsprings when reaching adulthood were registered daily. Gompertz and Weibull models were built with daily survivorship data, Biological and demographic parameters were obtained and compered with Kruskal-Wallis non-parametric ANOVA and multiple comparisons with α= 0.05. Nymphal period was significantly longer on Baguette Premium 11 and BioInta 2004 (9.5 - 8.9 days) whereas on Colibrí and BioInta 1002 was shorter (5.66 - 5.42 d). The reproductive period lasted more on ACA 315, Baguette Premium 11 and BioInta 2004 (40 - 28 d) and lasted around 5 d on BioInta 1002, Buck Meteoro and Klein Yarará. The net reproductive rate (R0) was significantly higher on BioInta 2004 and ACA 315 with 75.18 and 64.57♀♀/♀/generation, respectively, however the intrinsic rate of increase (rm) was significantly higher on Colibrí (0.279 ♀♀/♀/d) due to a short generational time (13.1 d). Due to the high values of the coefficients of determination (R2), the daily survival rates in the respective cultivars had a good adjustment in both Gompertz and Weibull models. Cohorts reared on the tested wheat cultivars, except ACA 315 and Klein Yarará, shown significantly lower intrinsic rates of increase indicating some resistance level regarding the susceptible cultivar Colibrí.

Keywords : Greenbug; Life tables; Intrinsic rate of increase.

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