Browsing by Author "Hassan, A. T."

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Environmental biology: an adaptive course in zoology
(Ibadan University Press, 2010) Hassan, A. T.
Insecticidal effects of four plants extract against prostephanus truncatus (horn) (coleoptera: bostrichidae) in infested dried cassava chips
(Maxwell Scientific Organization, 2011-11) Popoola, K. O. K.; Hassan, A. T.
The biological activity of Azardiractita indica (neem leaves), Tetrapleura tetraptera (seeds), Piper guinensee (alligator pepper seeds) and Xylopia aethiopica (black pepper seeds) extracts surface treatment applied at two different concentrations to dried cassava chips (Esculenta manihot) against Prostephanus truncatus (Horn) to determine infestation rate via mortality and emergence of the pest and weight loss in the dried cassava chips were conducted. The Bio assay was conducted under temperature and relative humidity of 27±2 and 65±5%, respectively within an investigation period of 28 days. Out of the four plants extract A. indica has the best insecticidal properties, this was followed by P. guinensee, T. tetraptera and X. aethiopica in a descending order of efficacy.
Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) ability to breed and damage potential on cassava dried chips
(Klobex Academic Publishers, 2001-12) Hassan, A. T.; Popoola, K. O. K.
Stored dried cassava chips are known to become heavily damaged by Prostephanus truncatus (Hum). A laboratory study was undertaken to determine the extent of losses that this insect pest could cause on TME 30572, the mean weight loss (±SD) rose to 36.93 ± 24.43% over the period of 112 days compared with 63.2 ± 3.37% for TME 1, under the same period and experimental condition, At each time interval of 28 days during which the cassava dried chips were examined, the weight loss in both varieties was on the increase, except, the 112 days where their was a drop in the weight loss in TME 30275 variety which was statistically significantly (t=0.033, P<0.05). Percentage mortality rate rose from 0% to 10.6% in TME 30572 larval, while zero mortality was recorded for TMEI larval. On the other hand, percentage mortality was on the increase in emergent adults for both cassava varieties. The highest percentage mortality in TME1 emergent adult was inflicted in TME1. However, storing TME 30572 rather than TME1 will not solve the problem of infestation and damage by P. truncatus because considerable damage is been inflicted on TME 30572. The experiment was conducted under ambient temperature of 30.3 ± 3.7°C and relative humidity of 84.7 ± 2.0% in the laboratory.
Studies on the lifecyc1e of aleurodicus dispersus (rusell) (homoptera: aleyrodidae) on potted cassava plant in a screen house
(Klobex Academic Publishers, 2002) Popoola, K. O. K.; Hassan, A. T.
The life cycle, and morphometries studies of A. dispersus (Rusell), white flies were conducted in a screen house in the Department of Zoology, University of Ibadan, Ibadan. The study revealed that A. disperses (Rusell) on cassava potted plants leaves, Manihot esculenta (Cranzt) (TMS 91934), have six stages, which include, egg first instar, secxond instar, third instar, pupa and adult. Trichoderma lignorum a fungal was identified as the cause of high mortality rate which occurred on the eggs and the intars of A. dispersus. The study was carried out under varied temperature and relative humidity of (27.20 - 30.33°C) and 68.00 - 82.33%) respectively for a period of 29 days.