Effect of maize hybrid on biology and digestive physiology of Triboliom castaneum (Herbest) (Coleoptera: Tenebrionidae)

Abbaszadeh, Farzad (2018) Effect of maize hybrid on biology and digestive physiology of Triboliom castaneum (Herbest) (Coleoptera: Tenebrionidae). Masters thesis, university of Mohaghegh Ardabili.

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Text (تأثیر بعضی از هیبرید¬های ذرت روی شاخص‌های تغذیه‌‌ای و فیزیولوژی گوارشی شپشه¬ی قرمز آرد Tribolium castaneum (Herbest) (Coleoptera: Tenebrionidae)) Farzad Abbaszadeh.pdf Download (503kB) | Preview

Abstract

The confused flour beetle, Tribolium castaneum (Herbest), is a polyphagous pest that attacks a large number of storage products. The effect of nine maize hybrids including SC704, BC678, AS71, SC703, PL472, AR89, KSC703, AS77 and Simax was studied on feeding indices and digestive enzymatic activity of T. castaneum at controlled conditions (30 ± 2°C, 65 ± 5% RH, and dark conditions). According to the results, the lowest food eaten by the fourth instar larvae, The lowest weight gain of larvae, the lowest value of the efficiency of conversion of ingested food, the lowest value of relative consumptin rate and the lowest relative growth rate were observed in hybrids Simax, AS77, AS77, Simax, AS77 respectively. Also, the highest food eaten, larval weight gain, relative consumptin rate and relative growth rate by fourth-instar larvae were observed in AS77 hybrid and the highest values of the efficiency of conversion of ingested food by adult stages was obtained in Simax hybrid. The lowest food eaten by the T. castaneum adults, the lowest weight gain of adults, the lowest value of the efficiency of conversion of ingested food, the lowest value of relative consumptin rate and the lowest of relative growth ratewere observed in hybrids SC703, AS77, AS77, SC703, AS77 respectively. Also, The highest food eaten by T. castaneum adults in KSC703 hybrid, high weight gain of adults in Simax hybrid, the highest values of the efficiency of conversion of ingested food in SC703 hybrid, the highest values of relative consumptin rate in KSC703 hybrid and the highest of relative growth rate in Simax hybrid was obtained. The least proteolytic activity of fourth instar larvae was found in hybrid AR89 (1.6306 ± 0.0077 U/mg) and its highest value was obtained in AS71 hybrid (2.8442 ± 0.013 U/mg). The lowest proteolytic activity of adults was observed in PL472 hybrid (3.1836 ± 0.0076 U/mg) and the highest level was related to insects fed on AS77 hybrid (5.0226 ± 0. 0347 U/mg). The lowest level of amylolytic activity of fourth-instar larvae was observed in the BC678 hybrid (0.0092± 0.00005 mU/mg) and its highest value was in the AR89 hybrid (0.01775± 0.00012 mU/mg). Also, the lowest amylolytic activity of adults was obtained on KSC703 (0.1013± 0.00004 mU/mg) and SC703 (0.1027± 0.00006 mU/mg) hybrids and its highest value was observed in the SC704 hybrid (0.1315± 0.00013 mU/mg). According to the results, the hybrids PL472, AS77 are Unsuitable hybrids for the growth of fourth instar larvae and hybrids BC678 and SC704 for the adults and can be cultivated in areas where this pest has a significant damage to the seeds in the warehouse to reduce the contamination of corn to this pest..

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