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DISTRIBUTION OF BEMISIA TABACI (HEMIPTERA: ALEYRODIDAE) BIOTYPES IN ITALY

Published online by Cambridge University Press:  31 May 2012

Stefano Demichelis ,
Domenico Bosco ,
Aulo Manino ,
Daniele Marian  and
Piero Caciagli
Stefano Demichelis*
Affiliation:
Di.Va.P.R.A. - Entomologia e Zoologia applicate all'ambiente, University of Torino, via L. da Vincì, 44–10095 Grugliasco (TO), Italy
Domenico Bosco
Affiliation:
Di.Va.P.R.A. - Entomologia e Zoologia applicate all'ambiente, University of Torino, via L. da Vincì, 44–10095 Grugliasco (TO), Italy
Aulo Manino
Affiliation:
Di.Va.P.R.A. - Entomologia e Zoologia applicate all'ambiente, University of Torino, via L. da Vincì, 44–10095 Grugliasco (TO), Italy
Daniele Marian
Affiliation:
Istituto di Fitovirologia Applicata - C.N.R., Strada delle Cacce 73, 10135 Torino, Italy
Piero Caciagli
Affiliation:
Istituto di Fitovirologia Applicata - C.N.R., Strada delle Cacce 73, 10135 Torino, Italy
*
1 Author to whom all correspondence should be addressed (E-mail: demichel@agraria.unito.it).
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Abstract

Esterase banding patterns in native polyacrylamide gel electrophoresis, squash silver leaf (SSL) induction, and tomato yellow leaf curl begomovirus-Sardinia (TYLCV-Sar) transmission capability were investigated to evaluate variations among populations of Bemisia tabaci (Gennadius) from Italy and to relate their distribution to their geographic origin. Adults of the B biotype, adults of the Q-like biotype (which is similar to a Spanish biotype), and adults without esterase bands were found. The B biotype has been found in Italy since 1989. Two populations, including mainly B and Q-like biotypes, showed similar TYLCV-Sar transmission efficiency, independent of esterase banding pattern. Only populations from Liguria and Sardinia, which contained almost exclusively B-biotype individuals, were able to induce SSL. We observed that adults of the B biotype are widespread in greenhouses of northern Italy and Sardinia, whereas those of the Q-like biotype are present only in fields of southern Italy. These results suggest that the B biotype of B. tabaci was introduced into Italy likely while trading ornamental plants, whereas the Q-like biotype is native to the Mediterranean region.

Résumé

Les divers phénotypes de l’isozyme estérase, la production de l’argenture (SSL) et la transmission de tomato yellow leaf curl begomovirus-Sardinia (TYLCV-Sar) ont été analysés pour étudier la variation dans les populations italiennes de Bemisia tabaci (Gennadius). Après ces analyses, le biotype B et un biotype Q (qui ressemble au biotype espagnol) ont été trouvés dans les adultes et la présence de beaucoup d’adultes sans bandes d’estérase était observée. Le biotype B a été trouvé en Italie dès 1989. Toutes les populations italiennes montraient la même abilité à transmettre TYLCV-Sar; la transmission de ce virus n’était pas reliée au phénotype esterase. Seulement les populations de Liguria et Sardegna étaient capables de provoquer l’argenture; tous les adultes de ces populations étaient du biotype B. Nous avons démontré que le biotype B est présent en Italie du nord et en Sardegna dans les serres, et qu’ un biotype Q est présent en Italie du sud en champ. Ces résultats suggèrent que le biotype B a sans doute été introduit lors de la commercialisation des plantes ornamentales, alors que le biotype Q est originaire du Bassin Méditerranéen.

Type
Articles
Information
The Canadian Entomologist , Volume 132 , Issue 4 , August 2000 , pp. 519 - 527
Copyright
Copyright © Entomological Society of Canada 2000

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