Occurrence of Entomopathogenic Fungi and Parasitic Nematodes onSpodoptera frugiperda(Lepidoptera: Noctuidae) Larvae Collected in Central Chiapas, México

Ramiro E. Ruiz-Nájera, Ramiro A. Ruiz-Estudillo, Juan M. Sánchez-Yáñez, Jaime Molina-Ochoa, Steven R. Skoda, Roberto Coutiño-Ruiz, René Pinto-Ruiz, Francisco Guevara-Hernández, John E. Foster
2013 Florida Entomologist  
Fall armyworm larvae (FAW), Spodoptera frugiperda (J. E. Smith) were collected from whorl-stage corn, Zea mays (L.), between the V 2 and V 4 stages, in 22 localities of Central, Chiapas, México, called "La Frailesca" during late Jun 2009 to determine the occurrence of native entomopathogens and parasitic nematodes, and to determine the most parasitized instars. A total of 1,247 larvae were examined in search of native biological control agents. Overall total larval mortality was 16.36%. The
more » ... was 16.36%. The percent larval mortality due to entomopathogens and parasitic nematodes was 12.99%. Hexamermis sp., probably albicans Siebold (Mermitha: Mermithidae) were isolated from 105 FAW larvae (8.42%) with highest incidence from the 4th, 5th, 6th and 3rd instars, respectively. A hyphomycete, Nomuraea rileyi Farlow (Samson), was recovered from 38 larvae (about 3.05% parasitism) with highest incidence in the 5th, 3rd, 4th, and 6th instars, respectively. Lowest percentage of FAW larval parasitism was caused by unidentified microsporidian or microsporidium (1.52%), infecting 19 larvae in the 6th, 5th and 3rd instars, respectively. First and 2nd instars did not show parasitism. This information is useful in designing future biological control programs. REsumEN Se recolectaron larvas de gusano cogollero (FAW), Spodoptera frugiperda (J. E. Smith) en maizales, Zea mays (L.) en etapa vegetativa de verticilio, entre las etapas V 2 y V 4, en 22 localidades de la región central de Chiapas, México, conocida como "La Frailesca" a fina-
doi:10.1653/024.096.0215 fatcat:kdx5cknehveufndholarupgfom