Téllez P, Ayra C, Morán-Bertot I, Rodríguez-Cabrera L, Sosa ÁE, Oliva O, Ponce M, Riverón A, Hernández D, Rodríguez-de la Noval C

Language: Spanish
References: 21
Page: 1511-1513
PDF size: 203.67 Kb.

ABSTRACT

The technology of transgenic crops involving plants containing insecticidal proteins derived from Bacillus thuringiensis (Bt) has to be protected against the intrinsic risk of insect-resistance through pest management strategies, the socalled ´high dose/refuge’ strategy the most frequently implemented. It comprises cultivating Bt-transgenic plants which effectively control the pest with a nearby cultivar of non-transgenic plants, known as ‘refuge’. This strategy assumes insect oviposition as an event of random distribution between both plant cultivars. In this work, oviposition and the survival of Spodoptera frugiperda were examined in Bt-corn and its conventional refuge cultivars in an experimental area for six cultivation seasons. The impact of this strategy on the emergence of insect-resistance was analyzed once applied the simulation models starting from the obtained data. This was the first report of a higher oviposition of S. frugiperda in all the conditions tested for Bt-corn over that of the refuge cultivar, when the damage caused by the pest in the refuge was statistically higher. Simulation models showed that this insect behavior accelerates its resistance against the Bt toxin it was exposed to. New key information is provided to optimize the management of insect resistance in Bt transgenic crops, further suggesting new interventions to control the population density of pest in the field. This research granted the 2015 Award of the Cuban National Academy of Sciences.

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