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Susceptibility of flours derived from various cereal grains to infestation by the rust-red flour beetle [Tribolium castaneum Herbst] [Coleoptera: Tenebrionidae] in different seasons

100%

Turaki J. M., Sastawa B. M., Kabir B. G. J., Lale N. E. S.

Journal of Plant Protection Research

2007

tom 47

nr 3

279-288

Two flour types (unpolished flour and polished one) and flour textures (grits and fine) of five cereal grains made up of millet, rice, wheat, sorghum and maize were evaluated under laboratory conditions for their susceptibility and progeny development in Tribolium castaneum in hot dry and cool humid seasons. T. castaneum thrived better during the cool humid season than the hot dry season. Polished flour was less susceptible to infestation and supported lower population of the beetles than unpolished flour. Index of susceptibility was 19.65-20.76% in unpolished flour and 18.89-19.76% in polished flour. The number of progeny that developed were 102.6-135.1 and 98.2-121.4 in unpolished and polished flours, respectively. Similarly, grit flour was significantly less susceptible than fine flour in both seasons. Rice, wheat and sorghum flours were less susceptible and supported significantly lower populations of T. castaneum than millet and maize flours in both seasons. Polished wheat flour supported least progeny number than the flour types of the other cereal grains. Conversely, significantly higher number of progeny developed in polished flour of millet and maize and unpolished flour of wheat. Millet fine flour and maize fine or grit flours were significantly more susceptible to infestation than flours of the other cereal grains.

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An appraisal of insect pests associated with cereal grains traded in Maiduguri, Borno State, Nigeria

88%

Mailafiya D. M., Dauda Z., Degri M. M., Kabir B. G. J., Maina Y. T.

International Letters of Natural Sciences

2014

tom 14

This study investigated insect pest infestation of maize, millet, sorghum, rice and wheat grains traded in the three main markets namely Monday, Baga-Road and Custom-Park markets in Maiduguri, Borno state, Nigeria. Sampling lasted from January to June 2012. Samples per grain type, each weighing one kilogram, were obtained every two weeks from ten randomly selected traders per market. Each sample was sieved in the laboratory to recover all adult insects present, both at sampling and also after one month stay (laid out in a completely randomized design). In each market, Sitophilus zeamais Motschulsky and Rhyzopertha dominica (F.) followed by Tribolium castaneum Herbst, Sitophilus oryzae (Linnaeus), Trogoderma granarium (Everts) or Cryptolestes sp. were the insect pests commonly found attacking more (between two to five) grain types. Observed highest and lowest mean insect numbers were respectively by S. zeamais in maize grains (12.13 individuals in Monday market) and T. granarium in wheat grains (0.13 individuals in Baga-Road market). Results unveil that among three markets, higher mean total numbers of insects were present in maize, rice or wheat (18-33). For all grain types, the mean numbers of damaged grains were significantly higher in Monday (53-357) and Custom-Park (46-302) than in Baga-Road (17-109) markets. Furthermore, the mean total number of damaged grains across markets was significantly higher maize, followed by rice and wheat (55-231) than in other grain types (37-41). The implications of all these results on insect infestation of different cereal grain types sold in these markets are discussed.

Ograniczanie wyników

1 International Letters of Natural Sciences

1 Journal of Plant Protection Research

2 Kabir B. G. J.

1 Dauda Z.

1 Degri M. M.

1 Lale N. E. S.

1 Mailafiya D. M.

1 Maina Y. T.

1 Sastawa B. M.

1 Turaki J. M.

1 2014

1 2007

Wyniki wyszukiwania

Susceptibility of flours derived from various cereal grains to infestation by the rust-red flour beetle [Tribolium castaneum Herbst] [Coleoptera: Tenebrionidae] in different seasons

An appraisal of insect pests associated with cereal grains traded in Maiduguri, Borno State, Nigeria