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Outstanding achievements in the research conducted in Madrid (Spain) on tomato resistance to Bemisia tabaci induced by biotic or abiotic factors.

AutorNombela, Gloria ; Muñiz, Mariano
Palabras claveBemisia tabaci
plant resistance
Fecha de publicación2009
CitaciónThe 5th International Bemisia Workshop. Guangzhou. China
ResumenInduced or acquired plant resistance against a pest or pathogen is the result of protective mechanisms activated by the plant upon contact with a previous invader or an abiotic factor. Research in our laboratory during the last years showed a great variability in the responses of susceptible tomato plants (cv.Marmande) to/by infestation of Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae). After limited exposure to the potato aphid Macrosiphum euphorbiae Thomas (Homoptera: Aphididae), the plants transiently expressed a local and systemic induced resistance to B. tabaci. Conversely, preinfestation with B. tabaci induced an increased susceptibility to the Sp clone of M. euphorbiae meanwhile no significant differences between preinfested and uninfested plants were observed when the response to another aphid clone (Nt) was evaluated. In other assays with both B and Q biotypes of B. tabaci it was observed that a first infestation with these insects increased tomato susceptibility to a second attack by the same species. Acquired resistance to B. tabaci (B and Q biotypes) was locally observed when tomato plants were sprayed with BTH (acibenzolar-S-methyl, the Syngenta plant activator Bion®), decreasing the total number of individuals and delaying the insect development. Moreover, the plant growth stimulant SB Plant Invigorator (SBPI® Stan Brouard Group) was effective for the control of B. tabaci on susceptible tomato, as foliar application with this product at 2ml/l solution inhibited larval development decreasing the risk of a new whitefly generation.
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