Descripción de los estados inmaduros de Astaena valida (Coleoptera: Melolonthidae: Melolonthinae: Sericini)

Abstract

RESUMENLas larvas y adultos de varias especies de Astaena dañan las raíces y el follaje de cultivos en climas templados y fríos en Colombia. En el presente artículo se describen la larva de tercer estadio y la pupa de macho y hembra de Astaena valida Burm., se ilustran sus caracteres diagnósticos y se propone una clave para distinguir sus larvas de otros Melolonthinae locales. Se confirmó que las larvas son rizófagas, y se encuentran en grupos de hasta 36 ejemplares/m 2 , prosperan en suelos disfuncionales, asociados a la rizósfera de yuca, pastos, cafeto, fique, tomate, piña, espárragos, maíz y ornamentales. Los adultos son fototáxicos, estacionales, activos en el período de lluvias de octubre y noviembre. Palabras Clave: Escarabajos, Astaena, rizófagos, larvas, Colombia. ABSTRACTLarvae and adults of some species of the genus Astaena may damage the roots and leaves of cultivated plants in the temperate and cold climates in Colombia. The third instar larva as well as male and female pupae of Astaena valida Burm. are described and illustrated. An identification key for the larvae of some genera of Colombian Melolonthinae is included. Larvae of A. valida live in disfunctional soils feeding on roots of yucca, grass, coffee, fique, tomato, pineapple, asparagous, maize and ornamental plants, with densities up to 36 grubs/m 2 . Adults have seasonal activity during October-November rainfall period, and are attracted to electric lights.

Biological aspects of Leucothyreus alvarengai Frey and Leucothyreus aff. semipruinosus Ohaus (Coleoptera, Melolonthidae, Rutelinae) in crop succession at central Brazil

“…Upon reaching the adult phase they weighed 101.0 mg on average (n = 25). Pardo-Locarno et al (2006) reported that third instar larvae of L. femoratus varied in length from 18 to 21 mm and in width from 4 to 5 mm, and width of the head capsules ranged from 3 to 3.2 mm. Puker et al (2009) found that adults of L. dorsalis measured on average 10.5 mm long by 4.6 mm wide.…”

“…as pests of the roots of plants in agroecological systems. Pardo-Locarno et al (2006) reported Leucothyreus femoratus Burmeister, 1844, in Colombia, as agriculturally important, both in their larval and adult phases.…”

Aspectos biológicos de Leucothyreus dorsalis Blanchard (Coleoptera, Scarabaeidae, Rutelinae)

“…Além do comprimento e largura, o peso das pupas fêmeas também foi superior ao dos machos, que pesaram respectivamente 189,9 e 141,1 mg e possuíam coloração amarela (Tabela II). As pupas dos machos de L. femoratus possuem corpo ovalado, robusto, coloração amarelo claro e medem cerca de 14 a 16 mm de comprimento por 7 a 12 mm de largura (Pardo-Locarno et al 2006).…”

Description of the third larval instar and pupa of Geniates barbatus Kirby (Coleoptera, Scarabaeidae, Rutelinae)

“…Although Ohaus (1900) recorded female pupae of Geniates barbatus and G. castaneus Burmeister, 1844, about 50 cm deep in the soil, their immature stages remain undescribed. In fact, the immature of only one species of Geniatini is known: Leucothyreus femoratus Burmeister, 1844, described by Pardo-Locarno et al (2006). Therefore the description of the larva and pupa of Geniates presented here represents an important addition to the knowledge of the immatures of Sacarabaeidae and to the taxonomy of Rutelinae.…”

“…Pardo-Locarno et al (2006) proposed the separation between Geniatini (based on L. femoratus) and Anoplognatini (based on two species of Platycoelia Dejean, 1833, the single genus with described larvae in Anoplognathini; see Paucar-Cabrera & Smith 2002) using maxillary and palidial characters, as follows: Geniatini have lacinia with two unci and the maxillary stridulatory organ formed by heterogeneous teeth; meanwhile Anoplognathini have lacinia with three unci and homogeneous teeth in the maxillary stridulatory organ. Regarding these characters, the larvae of G. barbatus resemble more the larvae of Platycoelia than the larvae of L. femoratus.…”