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Título

The virus-transmitter whitefly Bemisia tabaci increases tomato susceptibility to subsequent infestation by the same insect pest

AutorNombela, Gloria ; Pascual, S.; Gómez, Azahara A.; Avilés, M.; Alonso, D.; Muñiz, Mariano
Fecha de publicación2007
Citación2nd International Symposium on tomato diseases. Kusadasi (Turquía)
ResumenEfficient management of virus diseases requires a global knowledge of all factors involved, which includes the behaviour of vector insects. Both, B- and Q-biotypes of whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) are important pests of horticultural crops worldwide due to their ability to transmit a number of plant viruses to different cultivated species, including tomato. Infestation by pests or pathogens can induce responses in the plant that affect to a subsequent infestation by the same or another organism. These induced responses can be negative (induced or acquired resistance) or, on the contrary, they can increase the second infestation levels or even improve the development of the later organism. Studies on some of these interactions have been previously carried out by our research group. Now we present results from a study to analyze the tomato responses against the B- and Q- biotypes of B. tabaci induced after a previous infestation by the same organism, as well as those responses observed in crossed infestations by both whitefly biotypes. In free-choice assays with 11 day-old plants we observed that pre-infestation with Q-biotype males had an attractant effect on adults of the same biotype. This caused an increase of the numbers of eggs and individuals of the second generation. However, B- biotype did not affect to a later infestation by the Q- biotype. Preference and development of B- biotype was not affected by previous infestations with any of both biotypes. A general increase of the susceptibility to the B- biotype was observed in 25 and 53 day-old plants in no-choice assays. This was induced by a previous infestation with the same biotype, with significant differences in the oviposition values and, consequently, in the number of new individuals of the next generation. Finally, we demonstrated that the age of the plant did not influence these results. These interactions play an important role in the development of B. tabaci and would be taken into account in programs for the integrated management of these insects and the viruses they transmit.
URIhttp://hdl.handle.net/10261/21509
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