Article

Predicción de daños de la polilla guatemalteca Tecia solanivora (Povolny) 1973 (Lepidoptera: Gelechiidae) en el Ecuador

Boletín de sanidad vegetal. Plagas, ISSN 0213-6910, Vol. 29, Nº 2, 2003, pags. 233-242
Source: OAI

ABSTRACT La polilla guatemalteca Tecia solanivora (Povolny) 1973 es probablemente la plaga más peligrosa para cultivos de papa en Sudamérica. En el Ecuador el manejo de este insecto resulta muy difícil, ya que los factores bióticos de control natural, prácticamente son inexistentes, las únicas regulaciones naturales encontradas en la provincia del Carchi, son abióticas y están relacionadas a factores climáticos. Se observaron resultados significativos de correlación múltiple entre los tubérculos infestados y las variaciones climáticas medidas durante los primeros meses de inicio del cultivo en las parcelas de investigación. Se registraron correlaciones fuertes entre la infestación de los tubérculos y el vuelo de los machos, capturados en trampas de feromonas, (R>0.90) así como también entre el clima que éstos encontraron en el campo. Estos resultados nos dan la posibilidad de predecir en los estados tempranos de la floración, dos meses antes de la cosecha, cual va a ser el porcentaje de infestación de los tubérculos. Necesitamos solamente una combinación de trampas de feromonas, un thermohigrógrafo y un pluviómetro.

0 Bookmarks
 · 
90 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Abstract Chemical analysis of pheromone gland extracts followed by behavioural studies in the wind tunnel and by field trapping tests show that the sex pheromone of the Guatemalan potato moth, Tecia (Scrobipalpopsis) solanivora Povolny (Lepidoptera: Gelechiidae), is a blend of (E)-3-dodecenyl acetate, (Z)-3-dodecenyl acetate, and dodecyl acetate. A 100 : 1 : 20 blend of these compounds, formulated at 1000 µg on rubber septa, captured more males than the main compound alone. This lure was species-specific and did not capture the potato tubermoth, Phthorimaea operculella. A potato field was treated with a blend of these three compounds at a rate of 28 g ha−1. Male T. solanivora attraction to synthetic pheromone traps was almost completely suppressed for 2 months, demonstrating the potential use of pheromones for control of this economically important insect pest of potato in Central and Southern America.
    Entomologia Experimentalis et Applicata 02/2005; 114(2). DOI:10.1111/j.1570-7458.2005.00252.x · 1.71 Impact Factor
  • Source
    Entomologia Experimentalis et Applicata 01/2005; 114(114):137–142. · 1.71 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The level of genetic diversity within populations of introduced species has received increasing attention as an important factor influencing their survival and adaptive potential. We examined this issue with the Guatemalan potato tuber moth Tecia solanivora, an agricultural pest which has successfully invaded South America and the Canary Islands within the last 20years. To analyse changes in T.solanivora genetic diversity, the mitochondrial marker cytochrome b was sequenced from individuals collected across its known distribution area. High haplotypic diversity was observed in Guatemala, whereas only three haplotypes have been found in Venezuela and a single one in the remaining invaded South American countries and the Canary Islands. Invasive haplotypes were not observed in our samples from Guatemala but are closely related to Guatemalan haplotypes. These results are consistent with the hypotheses that (i) either a few individuals were introduced into Venezuela leading to a strong initial genetic bottleneck, or selection pressure may have lead to the disparition of all but a reduced number of introduced haplotypes, (ii) a second bottleneck occured between Venezuela and Colombia, and (iii) the invasion of the Canary Islands originated from South America. We further reviewed the recent literature to compare this change in genetic diversity with those reported for other invasive species. We quantified the changes in genetic diversity between native and introduced ranges for 57 biological invasions. We found that the genetic homogenization in T.solanivora was among the strongest reported and discuss factors that can explain the success of invasive populations with low genetic diversity.
    Biological Invasions 03/2007; 10(3):319-333. DOI:10.1007/s10530-007-9132-y · 2.72 Impact Factor

Preview (2 Sources)

Download
5 Downloads
Available from