The status of resistance to cyromazine, 2,2-dichlorovinyl dimethyl phosphate (DDVP), and permethrin relative to field populations of the house fly, Musca domestica L. from Argentinean poultry farms was studied. All the three studied populations (SV, Q, and C) showed resistant ratios (RRs) to cyromazine of 3.9, 10.98, and 62.5, respectively. We observed high levels of resistance toward the organophosphate DDVP and permethrin. The RRs to DDVP ranged from 45.4 to 62.5. No significant differences were found among the studied populations. All the house fly populations were permethrin-resistant, in comparison with the susceptible strain. Two of the analyzed populations (SV and Q) differed significantly in toxicity to the population C. This is the first evidence that house flies from Argentina showed a multi-resistance pattern. The implementation of an insecticide monitoring program on poultry farms of Argentina is needed to prevent field control failures. Furthermore, integrated control strategies are needed to delay detrimental development of insecticide resistance.

ZAPATER, M., and A. S. ROBINSON. 1986. Sex chromosome aneuploidy in a male-linked translocation in Ceratitis capitata.Can. J. Genet. Cytol. 28: 161-167. A translocation line in Ceratitis capitata (2n = 12) linking the male-determining Y chromosome with the autosome carrying the alcohol dehydrogenase (Adh) locus was examined to assign the locus to its chromosome. Adh was assigned to chromosome 2, the largest autosome, representing the first correlation between genetic and cytological data in this species. During the study, male adults with 11 and 12 chromosomes were identified in the population and a model was proposed to account for the appearance of these individuals. Predictions made from the model were in general verified by the subsequent experiments. It was shown that 1 1 -chromosome males were more fertile and produced more males than 12-chromosome males. Eleven-chromosome males produced 1 1 -and 12-chromosome progeny, whereas 12-chromosome males produced only 12-chromosome male progeny. The results are discussed with relation to sex determination in this species and to the use of male-linked translocations for the development of genetic sexing techniques.

Neotropical Entomology 32(3): 437-442 (2003) Espécies Sul-Americanas de Haplothrips (Thysanoptera: Phlaeothripidae), com Uma Nova Espécie de Interesse Para o Controle Biológico da Invasora Heliotropium amplexicaule (Boraginaceae), na Austrália RESUMO -Uma espécie nova, Haplothrips heliotropica, é descrita da Argentina, causando severos danos às folhas de Heliotropium amplexicaule (Boraginaceae), uma planta sul americana que é invasora agressiva em pastagens da Austrália. São apresentadas observações sobre especificidade de hospedeiros, variações sazonais de população e diapausa do tripes. O genero Haplothrips inclui mais de 230 espécies em todo o mundo, a maioria alimentando-se de flores. Em contraste, adultos e larvas de H. heliotropica alimentam-se exclusivamente de tecidos verdes. Esta é a terceira espécie de Haplothrips registrada na América doSul. São apresentadas as características para distinguir essas três espécies, e também para Haplothrips heliotropii Priesner do Egypt e do Yemen. PALAVRAS-CHAVE: Haplothrips heliotropica, América do Sul, tripesABSTRACT -A new species, Haplothrips heliotropica, is described from Argentina causing severe damage to the leaves of Heliotropium amplexicaule (Boraginaceae), a South American plant that is now a serious weed of pastures in Australia. Observations are presented on the host specificity, seasonal population changes and overwintering of this thrips. The genus Haplothrips includes more than 230 species worldwide, mostly feeding in flowers. In contrast, adults and larvae of H. heliotropica feed exclusively on green tissues. This is only the third South American species of Haplothrips. Character states are given for distinguishing these three species, and also for Haplothrips heliotropii Priesner from Egypt and Yemen.

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