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Articles by Patrick Obeng
Total Records ( 2 ) for Patrick Obeng
  Umar Sanda Issa , Kofi Frimpong-Anin , Yaw Danso , Ernest Baafi , Joseph Adomako , Patrick Obeng , Haruna Braimah , Kingsley Osei and Hugues Baimey
  Background and Objective: Sweetpotato is an important crop widely cultivated in many developing countries and insect pests are major production constraint. This study aimed to examine the response of different varieties to sweetpotato weevils (SPW) infestation under different ecological and cropping conditions. Materials and Methods: Ten sweetpotato plants were randomly harvested from each of 125 farms in 3 ecological zones. Leaves were examined for characteristic punctures, base of vines bisected for presence of tunnel and larvae and storage roots assessed for burrows. Results: Four sweetpotato weevils, Cylas puncticollis, Cylas formicarius, Cylas brunneus and Alcidodes spp. were identified with C. puncticollis as the pre-dominant species. Population density of SPWs and damage to foliage, vine base and storage root yield loss were significantly higher in transitional than savanna and semi-deciduous ecological zones. Local sweetpotato varieties did not show superior tolerance to SPW over improved varieties. The influence of cropping system on C. puncticollis was also not explicit. Conclusion: Sweetpotato in the transitional zone was more prone to SPW and driving factors must be further investigated. Local sweetpotato varieties did not exhibit higher tolerance to SPW over improved ones and therefore; increased adoption will enhance productivity and improve nutrition.
  Umar Sanda Issa , Kofi Frimpong-Anin , Ibrahim Adama , Moses Brandford Mochiah , Haruna Braimah and Patrick Obeng
  Background and Objective: The Fall Armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae) is a novel invasive pest in Africa but has established as a major pest of maize. Maize fields across six ecozones were surveyed for indigenous natural enemies of S. frugiperda in Ghana. Materials and Methods: Fifty maize plants showing signs of S. frugiperda infestation were sampled from three farms in each of the forty-eight districts blocked within all the six agro-ecological zones of Ghana. Collected S. frugiperda eggs and larvae were cultured in a laboratory for parasitoid emergence and percent parasitism determined. Results: Five species of egg and larval natural parasitoids comprising three Braconidae Coccygidium luteum Brullé, Chelonus sp. and Cotesia sp., one Ichneumonidae Campoletis sonorensis (Cameron) and one Tachinidae Exorista sp were identified. Among the predators recorded were coccinellids (Harmonia octomaculata [F.] and Coccinella transversalis [F.]) (Coleoptera: Coccinellidae), earwigs and spiders. C. luteum was the dominant natural parasitoid and also exhibited the highest field parasitism level, 6.38-10.71%. Parasitism levels of the other parasitoids ranged between 2.56-3.45%. The seemingly low field parasitism observed could be attributed to the high application of broad-spectrum insecticides which inadvertently is inimical to their development. Conclusion: Some indigenous parasitoids are adapting to S. frugiperda. Further exploration and protection of natural enemies through ecofriendly practices in a comprehensive IPM program is imperative for sustainable management of S. frugiperda.
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