Revista Brasileira de Gestao Ambiental e Sustentabilidade (ISSN 2359-1412)
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Home > Edições Anteriores > v. 5, n. 9 (2018) > Olaniran


Vol. 5, No 9, p. 261-269 - 30 abr. 2018


How pestiferous are maize weevil Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) and rust-red flour beetle Tribolium castaneum (Herbst, 1797) (Coleoptera: Tenebrionidae) against dried okra Abelmoschus esculentus (L.) Moench (Malvales: Malvaceae) fruit?

Oladele A. Olaniran , Samuel A. Babarinde , Fatai O. Alao , Adetayo D. Adeleye
Afeez Ige , Johnson A. Okunlola

Okra Abelmoschus esculentus (L.) Moench (Malvales: Malvaceae) is a major fruit vegetable consumed in either fresh or dried form in Africa. As part of our efforts to identify the pestiferous species attacking dried fruits, a laboratory experiment was conducted to investigate the damage potentials of Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) and Tribolium castaneum (Herbst, 1797) (Coleoptera: Tenebrionidae) against dried okra. Three levels of infestations (5, 10 and 20 adults of each insect) on dried okra and okra without insect infestation, which served as control were kept under ambient conditions. The experiment was laid out in completely randomized design and replicated thrice. Data were collected on percentage insect mortality, okra weight loss and proximate composition. Percentage mortality increased with storage duration, while weight loss was significantly affected by insect infestation levels and ranged from 0.04%-0.18%, 0.07%-0.21%, 0.08%-0.22%, 0.07%-022%, 0.11%-0.22% and 0.12%-0.23% for 1, 2, 3, 4, 5 and 6 weeks after infestation, respectively. Crude fibre significantly increased with insect infestation (13.98%-14.62% for the infested okra compared with 9.12%-13.63% in the control), while other proximate components were not significantly affected. The results show that the two species pose no serious threat to intact dried okra, in the short term, but long term multiple generation infestation of dried okra by the insects may cause greater damage.

Dried okra fruit; Stored product pests; Weight loss; Proximate composition; Mortality.

Quão danosos são o gorgojo-do-milho Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) e o besouro castanho Tribolium castaneum (Herbst, 1797) (Coleoptera: Tenebrionidae) contra o fruto do quiabo Abelmoschus esculentus (L.) Moench (Malvales: Malvaceae) seco? O quiabo Abelmoschus esculentus (L.) Moench (Malvales: Malvaceae) é um dos principais vegetais consumidos em forma fresca ou seca na África. Como parte de nossos esforços para identificar as espécies que atacam frutos secos, um experimento de laboratório foi conduzido para investigar os potenciais danos de Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) e Tribolium castaneum (Herbst, 1797) (Coleoptera: Tenebrionidae) contra o quiabo seco. Três níveis de infestações (5, 10 e 20 adultos de cada inseto) em quiabo seco e quiabo sem infestação de insetos, que serviram de controle, foram mantidos em condições ambientais. O experimento foi apresentado em delineamento inteiramente casualizado e repetido três vezes. Os dados foram coletados sobre porcentagem de mortalidade por insetos, perda de peso do quiabo e composição centesimal. A mortalidade percentual aumentou com a duração do armazenamento, enquanto a perda de peso foi significativamente afetada pelos níveis de infestação de insetos e variou de 0,04%-0,18%, 0,07%-0,21%, 0,08%-0,22%, 0,07%-022%, 0,11%-0,22% e 0,12%-0,23% para 1, 2, 3, 4, 5 e 6 semanas após a infestação, respectivamente. A fibra bruta aumentou significativamente com a infestação de insetos (13,98%-14,62% para o quiabo infestado, em comparaçõo com 9,12%-13,63% no controle), enquanto outros componentes centesimais não foram significativamente afetados. Os resultados mostram que as duas espécies não representam uma séria ameaça para o quiabo seco intacto, em curto prazo, mas a infestação por longo prazo de gerações múltiplas de quiabo seco pelos insetos pode causar maiores danos.

Quiabo; Peste de produtos estocados; Perda de peso; Composição centesimal; Mortalidade.


Texto completo

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ISSN 2359-1412