Life cycle of Euchistus rufimanus (Stall) (Hemiptera : Pentatomidae) a corn pest in the eastern plains of Colombia

Maize is an important crop in the well drained savannas in the Colombian eastern planes (known as ‘Llanos Orientales’) because of its economical potential in the balanced feed industry for livestock. However, insects like the brown stinkbug, Euschistus rufimanus (Hemiptera : Pentatomidae), is among...

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Detalles Bibliográficos
Autores Principales: Agudelo, Judith Guevara, Cardona, Marco Antonio, Pinto, Indira
Formato: Artículo (Article)
Lenguaje:Español (Spanish)
Publicado: Corporación Colombiana de Investigación Agropecuaria (Agrosavia) 2019
Acceso en línea:http://hdl.handle.net/20.500.12324/35080
Descripción
Sumario:Maize is an important crop in the well drained savannas in the Colombian eastern planes (known as ‘Llanos Orientales’) because of its economical potential in the balanced feed industry for livestock. However, insects like the brown stinkbug, Euschistus rufimanus (Hemiptera : Pentatomidae), is among the entomological problems that can seriously affect this crop. It causes malformation and decrease of leaf area index on young leaves, loss of apical dominance, sterility and death. This study established the insect life cycle under greenhouse conditions. Study temperature and relative humidity conditions were 28°C ± 2°C and 75% RH, respectively. Bugs were collected from cornfields and reared under controlled conditions to determine egg to adult development. The life cycle was as follows: the egg to adult period was 43.51 days; eggs 4.88 ± 0.14 days; nymphs undergo five instars: instar I 3.64 ± 0.07 days, instar II, 8.53 ± 0.50 days; instar III, 8.17 ± 0.51 days; instar IV, 7.70 ± 0.54 days, and instar V 10.57 ± 0.63 days. Nymphs of instar II had the highest mortality rate (60.68%). Average male longevity lasted 74.52 ±4.87 days and 77.5 ± 5.65 days for females. Pre-copulation period was 7.66 ± 1.17 days, and pre-oviposition lasted 8.32 ± 1.18 days; The female bug laid on the average 32.24 nests, with a mean of 77.12 ± 10.87 eggs. This information is very important to determine pest integrated management strategies against E. rufimanus.