Studies on the Effect of Host Type and Textures on the Survival of Tribolium castaneum (Coleoptera: Tenbrionidae) Parental and Filial Generations

Berhanu, Hiruy (2010) Studies on the Effect of Host Type and Textures on the Survival of Tribolium castaneum (Coleoptera: Tenbrionidae) Parental and Filial Generations. Masters thesis, Addis Ababa University.

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Abstract

The development of Tribolium castaneum (Herbst) was studied at two levels of grain breakage (10, 50%), milled (flour) and whole grain of 20 g different grains or hosts (maize, barely, wheat, sorghum, chick pea, faba bean, field pea and haricot bean) that were purchased from Markato. These 10 and 50% broken, whole flour, and whole grain (control) were kept in an oven at 40 C for four hours to disinfest from internal infestation. Then 20 g of each of the four distinct textures (including the control) of the grains were put in 32 one liter capacity glass jars each and adults (seven pairs), 1-3 days old T. castaneum were introduced in each jar containing 20 g of each of the three distinct textures of the grains. Following this, the different textures of the grains in each of the 32 glass jars were kept under laboratory condition (27±2 ºC and 60-65% relative humidity) and female beetles were allowed to lay eggs for 20 days after which all dead or live insects were removed. Thereafter, the treatments were left and checked daily until larva, pupa and adult emergence respectively. Larvae, pupae and adults’ emergence was recorded subsequently 12, 5 and 20 days in succession after the first larva, pupa and adult emergence in each treatment and replicate. The experiment was set up in a completely randomized design in three replications in Addis Ababa university of Ethiopia for two generations. The result obtained indicated that adults’ survival and progenies development of T. castaneum in whole and broken grains derived from eight local hosts or grains mentioned above were varied. Survival of parental adult beetles was significantly lower (P< 0.05) in whole than in broken grains and flour in all cereal grains. Significantly (P< 0.05) higher mean number of Larva, pupa and adult progenies emergence of T. castaneum was recorded in whole milled cereal grains than in whole grains of cereals and in both the control and all other forms of pulses (Chick Pea, Faba Bean, Field Pea and Haricot Bean) both in the 1st and 2nd generations. Significantly (P< 0.05) higher number of T. castaneum larvae, pupae and adults progenies were recorded in whole milled, 50% and 10% grain breakage of cereal grains, respectively than in whole grain (the control) of cereals and in both the control and all other forms of pulses. Besides, significantly less (P< 0.05) number of T. castaneum larvae, pupae and adults progenies were recorded in almost all forms of pulses than in all forms of the cereal grains, except the control. The results also showed that in damaged cereal grains more larvae, pupae and adults progenies were emerged during the first generation than in the second. Moreover, significantly less (P< 0.05) number of larvae, pupae and adults were emerged in whole grains in the 1st and 2nd generations when compared with the number of larvae, pupae and adults developed in broken and milled grains of cereals.

Item Type:	Thesis (Masters)
Subjects:	Q Science > Q Science (General) Q Science > QH Natural history > QH301 Biology Q Science > QL Zoology
Divisions:	Africana
Depositing User:	Selom Ghislain
Date Deposited:	17 Sep 2018 12:45
Last Modified:	17 Sep 2018 12:45
URI:	http://thesisbank.jhia.ac.ke/id/eprint/5301

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