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Ecological Research

, Volume 4, Issue 2, pp 199–208 | Cite as

Principal component analyses of bagged wheat infested withSitotroga cerealella (Lepidoptera: Gelechiidae) andSitophilus oryzae (Coleoptera: Curculionidae)

  • Osamu Imura
  • Ranendra N. Sinha
Article

Abstract

Interrelations among biological and abiological variables over 22 weeks at 28°C and 60% RH were revealed by principal component analysis (PCA) on data collected from simulated bagged wheat (Triticum aestivum L.) which was not infested by insects (control system), was infested bySitophilus oryzae (L.) (SO system), bySitotroga cerealella (Olivier) (SC system) or by both species (SC+SO system). The variables measured were temperature, grain moisture, CO2, dust weight, fat acidity value, grain weight, germination, insect numbers and frequency of occurrence of microfloral species. The analysis indicated the interrelations among variables involved in degradation of the wheat. In the control system, the dominant interrelations were those among abiological variables, indicating that deterioration of the wheat was minimal. In the SO system, principal components which represented insect effects, seed quality and temperature-fungal relationships, were predominant. Similar factor-loading patterns were extracted both in the SC and SC+SO systems; the principal components suggested thatS. cerealella was mainly responsible for heavy deterioration of the wheat. The principal components, which were rotated orthogonally by 45δ, indicated that the process of wheat degradation in both systems proceeded gradually until week 10 or 15 and thereafter the rate of degradation was accelerated and serious grain quality loss occurred.

Key words

Bagged wheat Principal component analysis Sitophilus oryzae Sitotroga cerealella Stored-grain ecosystem 

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Copyright information

© the Ecological Society of Japan 1989

Authors and Affiliations

  • Osamu Imura
    • 1
  • Ranendra N. Sinha
    • 2
  1. 1.Stored-Product Entomology LaboratoryNational Food Research InstituteTsukuba, IbarakiJapan
  2. 2.Research StationAgriculture CanadaWinnipegCanada

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