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DESCRIPTION AND LIFE CICLE OF ASH PLANT BUG Tropidosteptes chapingoensis Carvalho & Rosas (Hemiptera: Miridae)

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Author(s): Juana Fonseca González, David Cibrián Tovar, Antonio Villanueva Morales y José Refugio Lomelí Flores

Journal: Ra Ximhai
ISSN 1665-0441

Volume: 3;
Issue: 2;
Start page: 443;
Date: 2007;
Original page

Keywords: Tropidosteptes chapingoensis | Chrysoperla sp | Erythmelus sp | Ash plant bug | Parasitoid | Predator.

ABSTRACT
SUMMARYThe life cycle of Tropidosteptes chapingoensis was studied under natural light conditions and temperature range of 20 to 27.5oC at Chapingo, México, with an average duration of 53.3 days. The specie exhibits five nymphal instars and the average length in mm for each of the instars is: 0.91, 1.41, 1.95, 2.46 and 2.96. The average length of the female is 3.71 mm and the male is 3.52 mm (wings and antennae not considered). A morphometric comparison was also made in two populations of ash plant bug, one from Chapingo, México and the other from Bogotá, Colombia; the lastest was also classified as T. chapingoensis by colombian specialists. The characteristics used for the comparisons were: the lengths of rostrum, hind tibia, each of the first through fourth antennal segments, pronotum and head, and widths of pronotum and head, being the length of hind tibia, second antennal segment, third antennal segment and first antennal segment the most useful to make the proper distinctions. From the observed results it was found that two populations are present. Also, the natural enemies of T. chapingoensis were studied in Chapingo, México. Two genera of entomophagous insects were recognized; the nymphs predator Chrysoperla sp. and the egg parasitoid Erythmelus sp. The second has a better potential to be used as biological control agent.
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Tango Jona
Tangokurs Rapperswil-Jona