Data/hora: 16/06/2024 08:16:17

Biblioteca(s): | Epagri-Sede.
Data corrente: | 26/10/2018
Data da última atualização: | 26/10/2018
Autoria: | CASTILHOS, R. V.; RIBEIRO, L. P.
Título: | Circadian feeding behavior of Dichelops melacanthus (Hemiptera: Pentatomidae) on maize crops.
Ano de publicação: | 2018
Fonte/Imprenta: | In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 27., CONGRESSO LATINO-AMERICANO DE ENTOMOLOGIA, 10., 2018, Gramado, RS. Resumos... Londrina, PR: Sociedade Entomológica do Brasil, 2018.
Idioma: | Inglês
Conteúdo: | The green-belly stink bug Dichelops melacanthus (Hemiptera: Pentatomidae) has worried growers due it?s high incidence and intensive damage on maize initial phase. The monitoring and control of this pest with spray of insecticides are unsuccessful owing to lack of knowledge about some behavioral aspects of this pest such as its location and preferred feeding time along the day. Therefore, this work aimed to evaluate circadian rhythm of feeding of D. melacanthus on maize. For that, plants from a maize field of the genotype P30F53 VYHR were artificially infested with D. melacanthus adults. Previously to infestation, plants were covered with a cage (1m length x 0,5m width x 0,5m height) coated with a Tulle fabric. Each cage encompassed 5 plants, and 10 adults (5 couples) were released into each cage. It were used 10 cages (experimental units), randomly distributed in maize field. After 24 h hours of infestation, the behavior of the insects was evaluated by visual observations every 3 hours (6:00, 9:00, 12:00, 15:00, 18:00, 21:00 and 24:00 h), and the number of insects present in the plants (stalk and leaves) was recorded. For nocturnal evaluations, a red led flashlight was used in order to visualize the insects without driving them off. The aforementioned procedures were carried twice, at 15 and 21 days after emergence, corresponding to V3 and V5 stages, respectively. Climatic factors were monitored and correlated to insects? feeding in plants. The number of D. melacanthus on plants was low at morning period, and increased in the afternoon with peak at 15:00 h on both stages evaluated. This may indicate that a heat uptake and raise in body temperature are necessary for beginning of foraging activity (basking behavior). Most of the insects visualized in maize plants were at the stalk region (>96%), evidencing feeding behavior. The feeding activity was positively correlated with air temperature, and negatively correlated with atmospheric pressure.
Palavras-Chave: | basking behavior; green-belly stink bug; seedling pest.
Categoria do assunto: | O Insetos e Entomologia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_41496.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (102874-1) - UPC - PL - DD -  -  -  - DIS