Browsing by Author "Kotey, D.A."
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Item Basic Developmental Characteristics of the Fall Armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), Reared under Laboratory Conditions(Psyche: A Journal of Entomology, 2023) Marri, D.; Mensah, S.A.; Kotey, D.A.; Abraham, J.; Billah, M.K.; Osae, M.Te life cycle of the invasive alien insect pest, fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith), was studied using a colony established from feld-collected larvae. Eggs, neonate larvae, and newly emerged adult moths were used in experiments to investigate the basic biology of the FAW. Adult females laid up to 1184 eggs with a mean of 469 ± 22 eggs per female. Te incubation period of eggs and percentage hatchability were 2-3 days and 80–87%, respectively. Te mean larval lengths from the frst to the sixth instar were 4.63, 6.60, 9.76, 15.86, 25.13, and 27.81 mm, respectively. Te mean larval weights were 0.003, 0.019, 0.045, 0.050, 0.060, and 0.067 g, respectively, for the six instars. Te mean width of the head capsule of the sixth instar larva was 2.76 mm. Te total larval duration throughout the six instar stages was 16–18 days, while the mean pupal weight was 0.25 ± 0.001 g and 0.35 ± 0.011 g for males and females, respectively. Te mean pupal length was 14.3 ± 0.16 mm for males and 17.2 ± 0.14 mm for females. Pupal duration ranged from 8 to 14 days, with a mean of 10.35 ± 0.26 days, while the pupal emergence rate ranged from 60 to 94%, with a mean of 80.25 ± 1.28%. Te life cycle of males lasted 33–44 days and that of females lasted 36–49 days under laboratory conditions. Adult copulation occurred between 8 and 11 pm, with the peak occurring at 9 pm. Tis study provides baseline information about the biology of the FAW. Apart from being an important reference point for future research on the FAW, the data provided would aid FAW management decision-making.Item The efficacy of two bio-rational pesticides on insect pests complex of two varieties of white cabbage (Brassica oleracea var. capitata L.) in the coastal savanna region of Ghana(springer, 2021) Ngosong, N. T.; Boamah, E. D.; Fening, K. O.; Kotey, D.A.; Afreh-Nuamah, K.Abstract Insect population count and yield were used to determine the effectiveness of two bio-rational pesti cides -a commercial formulation of Pieris rapae granu losis virus and Bacillus thuriengensis, Bypel 1® (PrGV + Bt) (1.5 g/l w/v) and aqueous neem kernel extract (ANKE) (50 g/l w/v), on the insect pests complex of two cabbage varieties, KK cross and Oxylus for two consecutive cropping seasons of 2016/2017. The exper iment was laid in a split-plot design with three replica tions, with the cabbage varieties as main plots and the bio-rational pesticides as subplots. Cabbage plots treat ed with Bypel 1® and ANKE had the lowest population of Plutella xylostella, Brevicoryne brassicae, Hellula undalis, Bemisia tabaci and Thrips tabaci for both sea sons. The control plot consistently had higher pest population in both seasons. There was no detrimental effect of bio-rational pesticides on natural enemies. The bio rational pesticides-treated plots produced higher yield than control plots. Mean numbers of P. xylostella was higher on KK (0.61, 1.46) compared to Oxylus (0.65, 1.70) in both seasons, respectively. The yield between the cabbage varieties was not significantly different in both seasons, although Bypel 1® and ANKE treated plots generally produced significantly higher yields than the control plot. Yield between both cropping seasons was significantly different (p = 0.039). These findings provide evidence that bio-rational pesticides may offer effective management of the pest complex of cabbage and may be successfully used as an integral part of IPM in Africa as a means to curb the abuse of synthetic insecticides.Item Factors influencing rice production in the south-eastern belt of Ghana(Heliyon, 2022) Bissah, M.N.; Kotey, D.A.; Tongoona, P.; Egbadzor, K.F.; Gracen, V.; Danquah, E.Y.Ghana has great potential to produce rice for local consumption, however, the average rice produced barely meets half of the country's consumption needs. Focus group discussions (FGDs) and surveys were held within the coastal lowland rice production belt in Ghana. The FGDs were held at Okyereko and Afife followed by surveys in the two communities in addition to Dawenya and Ashaiman. The objectives were to assess the production challenges faced by farmers in the four communities and determine the rice traits preferred by the farmers. Twenty farmers were involved in each of the FGDs while 227 respondents were selected through convenient sampling for the interviews. Sixty-nine percent of respondent farmers were male, 53% were above 50 years while 44% had varied levels of education. Farmers preferences mainly related to marketable traits such as aroma (87%), taste (83%) and yield potential (78%). There was special preference for Jasmine 85 (62.8%) and Togo Marshal l (25%), an indication of the high adoption of aromatic rice varieties in the study areas. Challenges such as securing credit, input supplies, soil salinity and ageing work force were matters of grave concern to respondent farmers. Given the importance of rice cultivation in the study areas to Ghana’s quest to achieve self-sufficiency in rice, targeted and coordinated support from relevant governmental and non-governmental organizations is needed to sustain a higher level of production in the study areas.Item Farmer participation in selection within segregating populations of cowpea in Volta Region, Ghana(2015-11-01) Egbadzor, K.F.; Offei, S.K.; Danquah, E.Y.; Kotey, D.A.; Gamedoagbao, D.K.; Dadoza, M.; Yeboah, M.; Ofori, K.Abstract Background Participatory plant breeding leads to early adoption of a newly released variety as farmers would be aware of whatever advantage it might have over prior existing ones as early as possible. Cowpea farmers around Ohawu in the Volta Region of Ghana where the crop is one of the most important cash crops had no variety specifically developed for their environment. This research followed farmers’ interest identified earlier for the development of varieties with preferred consumer traits. Methods Farmers were chosen from 25 communities within the cowpea growing area by the help of agricultural extension officers. Fifty farmers including 25 males and females each, 7 scientists and 15 other persons with different backgrounds were involved in the selection exercise. The final plants selected were based on the total number of participants’ endorsement and analysis of variance for their seed size. Results Selections were made from six F3 populations with parents of various unique traits obtained from Botswana, Ghana, Nigeria, Senegal, or United States of America. Four most liked cowpea plants from each of the six populations were selected to be advanced and tried in multi-locations towards probable release. Conclusions Participants were very enthused with the selection exercise hoping of seeing some of their selections resulting into varieties. Farmers were interested in selecting plants with long multiple pods and early maturing. The exercise was educative for all participants.Item Farmer participation in selection within segregating populations of cowpea in Volta Region, Ghana(Agriculture & Food Security, 2015-11) Egbadzor, K.F.; Offei, S.K.; Danquah, E.Y.; Kotey, D.A.; Gamedoagbao, D.K.; Dadoza, M.; Yeboah, M.; Ofori, K.Background Participatory plant breeding leads to early adoption of a newly released variety as farmers would be aware of whatever advantage it might have over prior existing ones as early as possible. Cowpea farmers around Ohawu in the Volta Region of Ghana where the crop is one of the most important cash crops had no variety specifically developed for their environment. This research followed farmers’ interest identified earlier for the development of varieties with preferred consumer traits. Methods Farmers were chosen from 25 communities within the cowpea growing area by the help of agricultural extension officers. Fifty farmers including 25 males and females each, 7 scientists and 15 other persons with different backgrounds were involved in the selection exercise. The final plants selected were based on the total number of participants’ endorsement and analysis of variance for their seed size. Results Selections were made from six F3 populations with parents of various unique traits obtained from Botswana, Ghana, Nigeria, Senegal, or United States of America. Four most liked cowpea plants from each of the six populations were selected to be advanced and tried in multi-locations towards probable release. Conclusions Participants were very enthused with the selection exercise hoping of seeing some of their selections resulting into varieties. Farmers were interested in selecting plants with long multiple pods and early maturing. The exercise was educative for all participants.Item High chlorpyrifos levels on vegetables in Ghana(pesticides news (84):4-6, 2008) Afreh-Nuamah, K.; Kotey, D.A.; Gbewonyo, W.S.K.Revelations of high levels of pesticide residues on foodstuffs has led to an outcry over the inappropriate use of pesticides on vegetables cultivated in urban and peri-urban areas of Ghana. In 2006 a survey of sixty farmers from the Volta region of Ghana revealed inappropriate pesticide application practices. Residue analysis detected the presence of chlorpyrifos, DDT, cypermethrin, and dimethoate in shallots, with levels of chlorpyrifos exceeding the Codex maximum residue level in most samples.Item Response of pepper (Capsicum annuum L.) to preemergence application of Oxadiargyl and pendimethalin(Journal of Agriculture and Food Research, 2023) Nketiah, V.; Ofosu–Anim, J.; Cornelius, E.W.; Kotey, D.A.; Tetteh, R.Two field experiments were conducted in two agro-ecological zones of Ghana (Forest and Coastal Savannah) to assess the efficacy of preemergence herbicides Oxadiargyl and Pendimethalin on weed incidence, growth and yield of pepper. The experiment was factorial arranged in a randomized complete block design. The treatments were Oxadiargyl at 0.4, 0.5, 0.6 L/ha, Pendimethalin at 1.5, 2.0, 2.5 L/ha and hand weeding at intervals of 3, 6 and 9 weeks as control. Data was collected on weed type and abundance, number of days to weed emergence, type of re-emerging weeds and percentage weed cover. Data on plant height, number of branches per plant, yield and yield components of pepper plants were also collected. Results indicated that application of Pendimethalin led to a significantly (p < 0.05) longer number of days to weed emergence as compared to the application of Oxadiargyl which also delayed weed emergence significantly longer than hand weeding. Plant height was not affected by weed control method. The yield of pepper plants was significantly higher in plots where Pendime thalin (2.0 L/ha) was applied. Generally, the yield components of pepper plants have been positively affected by weed control treatments. However, application of Pendimethalin at 2.0 L/ha resulted in better weed control