Floresta e Ambiente
https://floram.org/article/588e21eee710ab87018b459f
Floresta e Ambiente
Original Article

BIOLOGIA E COMPORTAMENTO DE DYSDERCUS RUFICOLLIS (LINNAEUS, 1764) (HEMIPTERA: PYRRHOCORIDAE) EM CONDIÇÕES DE LABORATÓRIO

BIOLOY AND BEHAVIOUR OF Dysdercus ruficollis (LINNAEUS, 1764) (HEMIPTERA: PYRRHOCORIDAE IN LABORATORY CONDITIONS

Gonçalves, Lenicio

Downloads: 4
Views: 1656

Resumo

O objetivo deste trabalho foi estudar a biologia e o comportamento de Dysdercus ruficollis (Linnaeus, 1764) (Hemiptera: Pyrrhocoridae), uma importante praga do algodoeiro (Gossypium spp.). Em condições de laboratório, 50 insetos foram criados à temperatura de 25 ± 1 oC, UR de 80 ± 3 % e fotoperíodo de 12 h. As posturas foram realizadas durante o dia e à noite. Os ovos que originaram machos e fêmeas apresentaram o mesmo período de incubação (6 dias). Ocorreram cinco estágios ninfais. O período ninfal, a longevidade e o ciclo de vida dos machos foi de 31,35, 44,25 e 81,60 dias e das fêmeas foi de 32,50, 49,17 e 87,67 dias, respectivamente. O período médio de pré-cópula foi de 3,70 dias, de cópula 2,34 dias e de não-cópula 3,64 dias. O período médio de prépostura foi de 9,60 dias, de postura 12,70 dias e de pós-postura 3,40 dias. As fêmeas realizaram, em média, 3,65 posturas e houve decréscimo do número total de ovos da 1a para a 5a postura. A fecundidade média foi de 273,35 ovos e o número médio de ovos/postura 74,89. A fertilidade média foi de 5,30 ovos, o número médio de ovos férteis/postura 1,45 e a taxa de fertilidade 1,94 %.

Palavras-chave

praga, algodoeiro, percevejo

Abstract

The objective of this work was to study the biology and the behaviour of Dysdercus ruficollis (Linnaeus, 1764) (Hemiptera: Pyrrhocoridae), one important pest of cotton (Gossypium spp.). In laboratory conditions, 50 insects were reared at temperature of 25 ± 1 oC, 80 ± 3 % RH and photoperiod 12 L : 12 D. The females realized postures during the day and night periods. The eggs that gave origin to the males and the eggs that gave origin to the females presented the same incubation period, 6.00 days. Five nymphal stages occurred. The nymphal period, the longevity and the males life cycle were 31.35; 44.25 and 81.60 days, respectivilly and the females were of 32.50; 49.17 and 87.67 days, respectivilly. The median period of precopula was of 3.70 days, the copula one was 2.34 days and the no copula one was 3.64 days. The median period of pre-posture was of 9.60 days, the posture one was 12.70 days and the post-posture one was 3.40 days. The females realized in average 3.65 postures and there was a decrease of the total number of eggs from 1st to the 5th posture. The fecundity average was 273.35 eggs and the median number of eggs per posture was 74.89. The fertility average was of 5.30 eggs per female, the median number of fertile eggs per posture was 1.45 and the fertility rate was 1.94 %.

Keywords

pest, cotton-tree, bug
588e21eee710ab87018b459f floram Articles
Links & Downloads

FLORAM

Share this page
Page Sections