Abstract

FOGLIATA, Sofia V. et al. Pre- and post-zygotic incompatibility between two populations of Diatraea saccharalis Fabricius, 1794 (Lepidoptera: Crambidae) from Argentina: Preliminary studies of cane sugar refining in the off season. Rev. ind. agric. Tucumán [online]. 2017, vol.94, n.1, pp.13-20. ISSN 1851-3018.

Diatraea saccharalis (Fabricius) (Lepidoptera: Crambidae) is one of the most important pests in the North of Argentina in sugar cane and in the Pampas region is the most important pest in maize and sorghum. It is a polyphagous species, with bioecological characteristics that could generate a limited gene flow among the populations of the country, favoring the appearance of biotypes. Therefore, the objective of the study was to characterize the biology and reproductive compatibility of two populations collected in Buenos Aires (maize) and Tucumán (sugarcane) in Argentina. The collected larvae were kept in the laboratory under controlled conditions (25 ± 2 ºC, 75% RH, 14:10 L / O). The parameters evaluated were: egg duration, larvae and pupa, pupae weight, adult longevity and sex ratio, number of spermatophores, duration of periods of preoviposition, oviposition and postoviposition, fecundity and fertility. No significant differences were found in biological parameters, but prezygotic and postzygotic incompatibility was detected among populations. This result shows an interruption of the gene flow, suggesting that the populations of Tucumán and Buenos Aires are, possibly, different biotypes. This study constitutes the first record of reproductive isolation among populations of D. saccharalis from Argentina using biological parameters and reproductive compatibility, being useful to define strategies of management and control of populations of D. saccharalis in Argentina.

Keywords : Stem borer; biotypes; life cycle; gene flow.

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