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Egg Parasitoids Survey of Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) in Maize and Sorghum in Central Mexico

1
Posgrado en Fitosanidad-Entomología y Acarología, Colegio de Postgraduados, Estado de México, 56230 Texcoco, Mexico
2
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Campo Experimental Bajío, Guanajuato, 38010 Celaya, Mexico
*
Author to whom correspondence should be addressed.
Insects 2020, 11(3), 157; https://doi.org/10.3390/insects11030157
Received: 30 October 2019 / Revised: 4 December 2019 / Accepted: 9 December 2019 / Published: 1 March 2020
Spodoptera frugiperda (Smith) is the main maize pest in America and was recently detected as an invasive pest in some countries in Asia and Africa. Among its natural enemies presented in Mexico, Trichogramma pretiosum Riley is the only egg parasitoid used in Integrated Pest Management (IPM) programs regardless of its effectiveness. A search for natural enemies of S. frugiperda was then carried out to determine whether this parasitoid has been established, and to detect native egg parasitoids or predators associated with this pest. The sentinel technique (egg masses) was used, and then placed in maize and sorghum fields in the state of Guanajuato, Mexico. Trichogramma atopovirilia Oatman and Platner, an egg parasitoid, and Chelonus insularis Cresson egg-larva parasitoid were recovered from field surveys. Among the natural enemies that preyed on eggs of S. frugiperda, we found mites of the genus Balaustium, and Dermaptera of the genus Doru, both species in great abundance. Laboratory tests were performed to compare the potential parasitism of T. atopovirilia against T. pretiosum. T. atopovirilia obtained 70.14% parasitism while T. pretiosum, 29.23%. In field cages, three doses of the parasitoids were tested. Total parasitism did not exceed 8% in any of the two species, but T. atopovirilia parasitized a greater number of hosts using two and three parasitoids per pest egg. Then, the use of Trichogramma species needs to be reevaluated in biological control programs against S. frugiperda. View Full-Text
Keywords: Trichogramma atopovirilia; Trichogramma pretiosum; fall armyworm; natural enemies Trichogramma atopovirilia; Trichogramma pretiosum; fall armyworm; natural enemies
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Jaraleño-Teniente, J.; Lomeli-Flores, J.R.; Rodríguez-Leyva, E.; Bujanos-Muñiz, R.; Rodríguez-Rodríguez, S.E. Egg Parasitoids Survey of Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) in Maize and Sorghum in Central Mexico. Insects 2020, 11, 157.

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