Descripción y ciclo de vida de la chinche del fresno Tropidosteptes chapingoensis Carvalho & Rosas (Hemiptera: Miridae)

Juana Fonseca González; David Cibrián Tovar; Antonio Villanueva Morales; José Refugio Lomelí Flores

doi:10.35197/rx.03.03.2007.01.jf

Authors

Juana Fonseca González Universidad Autónoma del Estado de Hidalgo
David Cibrián Tovar Universidad Autónoma Chapingo
Antonio Villanueva Morales Instituto de Fitosanidad del Colegio de Postgraduados
José Refugio Lomelí Flores Colegio de Postgraduados

DOI:

https://doi.org/10.35197/rx.03.03.2007.01.jf

Keywords:

Tropidosteptes chapingoensis, Chrysoperla sp, Erythmelus sp, ash bug, parasitoid, predator

Abstract

In Chapingo, Mexico, the life cycle of Tropidosteptes chapingoensis was studied in a temperature range of 20 to 27.5°C and under natural light conditions; said cycle requires an average of 53.3 days to complete. The species has five nymphal instars; the average length in mm for instars 1 to 5 is respectively: 0.91, 1.41, 1.95, 2.46 and 2.96. The average length of the female is 3.71 mm and that of the male is 3.52 mm (without measuring wings or antennae). Additionally, a morphometric comparison was made of two populations of ash bugs, one from Chapingo, Mexico and the other from Bogotá, Colombia; the latter was also identified as T. chapingoensis by Colombian specialists and it has been assumed that it entered that country from Mexico. The characters used for the comparison of the samples were: length of the rostrum, length of the posterior tibia, length of each of the four antennal segments and length and width of the head and pronotum. The characters that best differentiate these populations were: length of the posterior tibia, second antennal segment, third antennal segment and first antennal segment (in order from highest to lowest discriminating power). According to the results, it was concluded that both populations are distinct (a£0.05). The natural enemies of T. chapingoensis in Chapingo, Mexico were also studied; two genera of entomophagous insects were recognized, a predator of nymphs that was identified as Chrysoperla sp (Neuroptera:Chrysopidae) and an egg parasitoid identified as Erythmelus sp, (Hymenoptera:Mymaridae) which, being more specific, seems to have greater potential as a regulator of the bug population.

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