Sampson Addae | University Of Ghana, Accra,Legon (original) (raw)

Papers by Sampson Addae

Research paper thumbnail of Efficacy of some plant extracts as a safe and sustainable management option for Sitophilus zeamais (Motschulsky) in stored maize

The use of synthetic chemical insecticides has proven effective in controlling insects. However, ... more The use of synthetic chemical insecticides has proven effective in controlling insects. However,
indiscriminate use is associated with a variety of health and environmental problems. Plantbased
products could be an alternative for pest control because of their natural originality,
low/non mammalian toxicity, biodegradability, zero residual effect and accessibility. A survey
conducted in the Southern part of Volta region in Ghana collected data on plant species used
as maize protectants. A total of eleven plant species were obtained. Seven out of the eleven
were selected based on their availability and accessibility including lemon grass (Cymbopogon
citratus), basil (Ocimum basilicum), Acheampong leaves (Chromolaena odorata), garlic
(Allium sativum), Africa scent leaf (Ocimum gratissimum), guava leaves (Psidium guajava),
onion (Allium cepa) for preliminary screening. Four most efficacious species (Cymbopogon
citratus, Psidium guajava, Ocimum basilicum and Ocimum gratissimum) were selected for
further work in the laboratory at 28±2°C, 65% RH and 12D:12L against S. zeamais. The assays
were conducted by treating 50 g of maize with methanol extracts at the rates of 0.2, 0.3, 0.4 and
0.5 g/mL. Contact toxicity, repellency, effects on oviposition, development, seed damage, and
weight loss were assessed. The extracts significantly (p ≥ 0.05) reduced emergence of progeny
from adult weevil, eggs and immature stages. The extracts had a reproduction inhibition rate of
81–100%. The extracts protected maize against damage by S. zeamais for 12 weeks. Maximum
weight loss and seed damage of 11.3% and 8.7%, were recorded compared to control with
21.4% and 24.7%, respectively. The extracts could therefore be used as alternatives for synthetic
insecticides.

Research paper thumbnail of Impact of Illegal Mining Activities on Cocoa Pollinator Abundance in Ghana

IntechOpen eBooks, Jan 24, 2024

Research paper thumbnail of The butterfly community assemblage of Mowire Quarry Site in the forest agroecological zone of Ghana: Response of indicator biodiversity to ongoing quarry operations

Quarry operations cause serious environmental impact on invertebrate communities and contribute n... more Quarry operations cause serious environmental impact on invertebrate communities and contribute negatively to habitat destruction and the species they promote but very little is still known about the response of butterflies to such disturbances in western Africa. The current study provides data from a baseline survey of butterflies at Mowire quarry site in the agroecological zone of Ghana and investigates the effects of ongoing quarry operations on butterfly diversity. Specifically quarry operations were assessed on species abundance and richness. A total of 417 individual butterflies belonging to 67 species from 5 families was recorded in three zones. High relative abundance in the Eastern Zone (EZ) (N = 329) and high species richness (S = 55) may be due to increased flowering plants diversity which contain sweet nectar which attracts and support rich butterfly abundance. Low species richness (S = 22) and relative abundance (N= 41) in the Western Zone (WZ), and Northern Zone (NZ) (...

Research paper thumbnail of Environmental pollution and arthropod community change: Impact of quarry activities on invertebrate biodiversity in Ghana

Quarry operations can have a negative impact on invertebrate biodiversity and threaten local spec... more Quarry operations can have a negative impact on invertebrate biodiversity and threaten local species through a variety of factors, such as habitat loss and pollution. Quarrying is a common practice in Ghana, but little is known about its effects on local insect diversity and abundance. In this study, the relationship between quarry operations and insect communities on an active quarry site, the Mowire quarry site in the Ashanti region of Ghana was assessed. Transect counts, aerial nets, pitfall traps, Flight interception traps (FIT) and fruit baiting (Charaxes) traps were employed to assess arthropod assemblage, specifically insects as a surrogate for arthropod communities. A total of 2,902 individual insects belonging to 56 families and eleven orders were recorded in all transect points across the three sampling zones. Quarry operations had little impact on the relative abundance (N = 974) of insects at Transect point (TP) 400m in the Eastern Zone (EZ), species richness (S = 49) an...

Research paper thumbnail of Efficacy of some plant extracts as a safe and sustainable management option for Sitophilus zeamais (Motschulsky) in stored maize

The use of synthetic chemical insecticides has proven effective in controlling insects. However, ... more The use of synthetic chemical insecticides has proven effective in controlling insects. However,
indiscriminate use is associated with a variety of health and environmental problems. Plantbased
products could be an alternative for pest control because of their natural originality,
low/non mammalian toxicity, biodegradability, zero residual effect and accessibility. A survey
conducted in the Southern part of Volta region in Ghana collected data on plant species used
as maize protectants. A total of eleven plant species were obtained. Seven out of the eleven
were selected based on their availability and accessibility including lemon grass (Cymbopogon
citratus), basil (Ocimum basilicum), Acheampong leaves (Chromolaena odorata), garlic
(Allium sativum), Africa scent leaf (Ocimum gratissimum), guava leaves (Psidium guajava),
onion (Allium cepa) for preliminary screening. Four most efficacious species (Cymbopogon
citratus, Psidium guajava, Ocimum basilicum and Ocimum gratissimum) were selected for
further work in the laboratory at 28±2°C, 65% RH and 12D:12L against S. zeamais. The assays
were conducted by treating 50 g of maize with methanol extracts at the rates of 0.2, 0.3, 0.4 and
0.5 g/mL. Contact toxicity, repellency, effects on oviposition, development, seed damage, and
weight loss were assessed. The extracts significantly (p ≥ 0.05) reduced emergence of progeny
from adult weevil, eggs and immature stages. The extracts had a reproduction inhibition rate of
81–100%. The extracts protected maize against damage by S. zeamais for 12 weeks. Maximum
weight loss and seed damage of 11.3% and 8.7%, were recorded compared to control with
21.4% and 24.7%, respectively. The extracts could therefore be used as alternatives for synthetic
insecticides.

Research paper thumbnail of Impact of Illegal Mining Activities on Cocoa Pollinator Abundance in Ghana

IntechOpen eBooks, Jan 24, 2024

Research paper thumbnail of The butterfly community assemblage of Mowire Quarry Site in the forest agroecological zone of Ghana: Response of indicator biodiversity to ongoing quarry operations

Quarry operations cause serious environmental impact on invertebrate communities and contribute n... more Quarry operations cause serious environmental impact on invertebrate communities and contribute negatively to habitat destruction and the species they promote but very little is still known about the response of butterflies to such disturbances in western Africa. The current study provides data from a baseline survey of butterflies at Mowire quarry site in the agroecological zone of Ghana and investigates the effects of ongoing quarry operations on butterfly diversity. Specifically quarry operations were assessed on species abundance and richness. A total of 417 individual butterflies belonging to 67 species from 5 families was recorded in three zones. High relative abundance in the Eastern Zone (EZ) (N = 329) and high species richness (S = 55) may be due to increased flowering plants diversity which contain sweet nectar which attracts and support rich butterfly abundance. Low species richness (S = 22) and relative abundance (N= 41) in the Western Zone (WZ), and Northern Zone (NZ) (...

Research paper thumbnail of Environmental pollution and arthropod community change: Impact of quarry activities on invertebrate biodiversity in Ghana

Quarry operations can have a negative impact on invertebrate biodiversity and threaten local spec... more Quarry operations can have a negative impact on invertebrate biodiversity and threaten local species through a variety of factors, such as habitat loss and pollution. Quarrying is a common practice in Ghana, but little is known about its effects on local insect diversity and abundance. In this study, the relationship between quarry operations and insect communities on an active quarry site, the Mowire quarry site in the Ashanti region of Ghana was assessed. Transect counts, aerial nets, pitfall traps, Flight interception traps (FIT) and fruit baiting (Charaxes) traps were employed to assess arthropod assemblage, specifically insects as a surrogate for arthropod communities. A total of 2,902 individual insects belonging to 56 families and eleven orders were recorded in all transect points across the three sampling zones. Quarry operations had little impact on the relative abundance (N = 974) of insects at Transect point (TP) 400m in the Eastern Zone (EZ), species richness (S = 49) an...