SCARABAEIDAE PRAGAS EM SUCESSÃO DE SOJA E ALGODÃO EM CAMPO NOVO DOS PARECIS, MT

O Estado de Mato Grosso possui as maiores áreas cultivadas com soja e algodão e face às extensas áreas cultivadas várias são as espécies de pragas que ocorrem, incluindo os coleópteros fitófagos da família Scarabaeidae. Assim, foram desenvolvidos estudos para conhecer as espécies de Scarabaeidae ocorrentes no sistema de sucessão de cultura de soja e algodão em Campo Novo dos Parecis, MT. Para obtenção dos imaturos foram realizadas amostragens em janeiro de 2011, na cultura da soja, em abril na cultura do algodão, em julho quando a área estava em pousio e na cultura da soja em dezembro. Em 2012, as amostragens foram realizadas em janeiro na cultura da soja e em fevereiro e março na cultura do algodão. As larvas amostradas foram levadas para o laboratório de entomologia da Universidade Estadual de Mato Grosso do Sul, e criadas até atingirem a fase adulta. Em janeiro, abril, julho e dezembro de 2011, coletaram-se respectivamente, 1,0, 0,0, 0,0 e 0,7 larvas m-2 e em janeiro, fevereiro e março de 2012, 1,0, 0,0 e 0,0 larvas m-2, respectivamente. Os adultos foram identificados como Leucothyreus sp e Leucothyreus aff. ambrosius. Nos estudos realizados na sucessão de soja e algodão, em Campo Novo dos Parecis, Leucothyreus se caracteriza como o principal gênero de Scarabaeidae praga

Figs. 9–13. Bothynus medon, third instar. 9 in Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae)

Figs. 9–13. Bothynus medon, third instar. 9) Hypopharynx; 10) Labium; 11) Antennal apex; 12) Raster;Published as part of <i>Pereira, Alex Furquim, Rodrigues, Sérgio Roberto & Ide, Sergio, 2013, Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae), pp. 328-334 in The Coleopterists Bulletin 67 (3)</i> on page 332, DOI: 10.1649/0010-065X-67.3.328, <a href="http://zenodo.org/record/10100793">http://zenodo.org/record/10100793</a&gt

Fig. 2 in Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae)

Fig. 2. Bothynus medon, third instar. Scale bar = 2 mm.Published as part of <i>Pereira, Alex Furquim, Rodrigues, Sérgio Roberto & Ide, Sergio, 2013, Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae), pp. 328-334 in The Coleopterists Bulletin 67 (3)</i> on page 330, DOI: 10.1649/0010-065X-67.3.328, <a href="http://zenodo.org/record/10100793">http://zenodo.org/record/10100793</a&gt

Figs. 3–8. Bothynus medon, third instar. 3 in Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae)

Figs. 3–8. Bothynus medon, third instar. 3) Head, frontal view; 4) Epipharynx; 5) Right mandible, a) ventral view, b) dorsal view; 6) Left mandible, a) dorsal view, b) ventral view; 7) Left maxilla, dorsal view; 8) Right maxilla, dorsal view. Scale bars = 1 mm.Published as part of <i>Pereira, Alex Furquim, Rodrigues, Sérgio Roberto & Ide, Sergio, 2013, Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae), pp. 328-334 in The Coleopterists Bulletin 67 (3)</i> on page 331, DOI: 10.1649/0010-065X-67.3.328, <a href="http://zenodo.org/record/10100793">http://zenodo.org/record/10100793</a&gt

Fig. 1 in Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae)

Fig. 1. Occurrence of the developmental stages of Bothynus medon in a corn-soybeans crop rotation system in Tangará da Serra, Brazil, from January to December. L1 = first instar; L2 = second instar; L3 = third instar.Published as part of <i>Pereira, Alex Furquim, Rodrigues, Sérgio Roberto & Ide, Sergio, 2013, Biology and Description of the Third Instar of Bothynus medon(Germar, 1824) (Coleoptera: Scarabaeidae: Dynastinae), pp. 328-334 in The Coleopterists Bulletin 67 (3)</i> on page 330, DOI: 10.1649/0010-065X-67.3.328, <a href="http://zenodo.org/record/10100793">http://zenodo.org/record/10100793</a&gt

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