5 research outputs found
Description of immature stages of Phyllophaga (Triodonyx) lalanza Saylor (Coleoptera: Melolonthidae, Melolonthinae)
Volume: 75Start Page: 153End Page: 15
New species of Phyllophaga Harris from Mesoamerica (Coleoptera: Melolonthidae; Melolonthinae)
Volume: 74Start Page: 39End Page: 4
An\ue1lisis hist\uf3rico de la clasificaci\uf3n de los coleoptera Scarabaeoidea o Lamellicornia
Three new species of Phyllophaga (s. str.) group rostripyga (Coleoptera: Melolonthidae, Melolonthinae) from Mexico and Guatemala
Volume: 76Start Page: 234End Page: 24
Biological aspects of Leucothyreus alvarengai Frey and Leucothyreus aff. semipruinosus Ohaus (Coleoptera, Melolonthidae, Rutelinae) in crop succession at central Brazil
Biological aspects of Leucothyreus alvarengai Frey and Leucothyreus aff. semipruinosus Ohaus (Coleoptera, Melolonthidae, Rutelinae) in crop succession at central Brazil. Beetles of the family Melolonthidae make up a large group and some species are considered pests of planted crops. Little information is available on the basic biological aspects of the genus Leucothyreus, such as association with cultivated crops and their occurrence periods. Therefore studies were developed in soybean and corn crops in Tangará da Serra, Mato Grosso, Brazil, with the objective of studying the occurrence and biological aspects of Leucothyreus alvarengai Frey and Leucothyreus aff. semipruinosus Ohaus. For acquisition of immature specimens of both species, in April 2011 sampling was performed in corn fields, in July and October in the fallow area, and in soybeans fields planted in December; in 2012 sampling was performed in January and February in soybean fields and in March in corn fields. In 2011 the total number of larvae obtained in April, July, October and December were 100, 6, 30 and 27, and in January, February and March of 2012 these quantities were 32, 52 and 65 larvae, respectively. In all sampling events the larvae of L. alvarengai were collected in greater quantity. At the beginning of the reproductive period of L. alvarengai and L. aff. semipruinosus, it was observed that the adults began to fly and soon after started oviposition in the field in September. The appearance of larvae coincides with the time of soybean planting in the field, thus the larvae feed on roots of soybean plants at the beginning of their development and the cycle from egg to adult of the two species was completed in one year