University of Khartoum

Biology, Major Hosts and Preference of the African bollworm, Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) to Three Tomato Cultivars at New Halfa Agricultural Scheme

Biology, Major Hosts and Preference of the African bollworm, Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) to Three Tomato Cultivars at New Halfa Agricultural Scheme

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Title: Biology, Major Hosts and Preference of the African bollworm, Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) to Three Tomato Cultivars at New Halfa Agricultural Scheme
Author: Hussien Abd Elkareim Mohamed, Mohamed
Abstract: Biology, Important Hosts and Preference of the African bollworm, Helicoverpa armigera Hubner (Lepidoptera: Noctuidae) to ThreeTomato Cultivars at New Halfa Agricultural Scheme Hussien Abd Elkareim Mohamed Faculty of Agriuclture, University of Khartoum ABSTRACT This study aims at investigating the biology , major host plants, preference between three tomato cultivars , seasonal incidence and the role of the natural enemies of the African bollworm, Helicoverpa armigera Hubner (Lepidoptera: Noctuidae). The field studies were conducted during three seasons (2007/08, 2008/09 and 2009/10) at the University Farm, New Halfa Agricultural Scheme and the insect rearing was carried out at the laboratories of the Faculty of Agriculture, University of Kassala, New Halfa. The developmental stages of Helicoverpa armigera were studied on the fruits of three tomato cultivars (Castle rock, Strain B and Peto 86) under laboratory conditions. The results showed that the egg incubation period was 2 to 3 days with a mean of 2.7 days. Larval duration was 13 to 18 days with a mean of 16.5 days. Pupal period ranged from 10.2 to 12.2 days with a mean of 10.8 days. The period from egg to adult emergence ranged from 25 to 33 days with a mean of 30 days. The life span of females ranged from 7 to15 days with a mean of 11.0 days. Fecundity was 255 to 850 eggs per female during an oviposition period of 4 to 9 days. The male life span ranged from 6 to 13 days with a mean of 9.9 days. The African bollworm was recorded on different host plants including pigeon pea, cotton, lablab bean, sunflower, sorghum, maize and a weed locally known as Tabar (Ipomea cordofana). Pigeon pea and lablab bean were the most preferred hosts. The highest incidence of the pest was recorded during winter seasons. No significant differences were obtained between tomato cultivars in the mean number of eggs, larvae and percentage of fruit damaged at harvest. Castle rock cultivar sometimes showed significant differences in the mean number of eggs, larvae and fruit damaged when compared with Strain B cultivar but no significant differences were found when compared with Peto 86 cultivar. Predators associated with the African bollworm at New Halfa Agricultural Scheme were Chrysoperlla spp., Cydonia vicina and spiders. Diplazon laetatorius (Hymenoptera: Ichneumonidae) and a tachinid fly, Tachina ebenery (Diptera: Tachinidae), were the only parasitoids found to attack the larvae of the African bollworm at the study site
Description: 135 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/12384
Date: 2015-06-15


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