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Botswana University of Agriculture and Natural Resources (BUANR) 2011

Evaluation of the diversity and pest status of fruit flies on marula, Sclerocarya Birrea in Gabane, Mochudi and Rasesa

Ntlogelang, Keabetswe

Titre : Evaluation of the diversity and pest status of fruit flies on marula, Sclerocarya Birrea in Gabane, Mochudi and Rasesa

Auteur : Ntlogelang, Keabetswe

Université de soutenance : Botswana University of Agriculture and Natural Resources (BUANR)

Grade : Master of Science (MS) 2011

Résumé partiel
Manila (Sclerocarya birrea) is one of the most useful indigenous trees in Africa. The fruits of marula are used to produce useful products such as juice, jam and beer. The seed kernels are very rich in proteins and can be processed into oil. The wood is carved to make pestles, mortars, bowls and saddles. The bark of the tree is used to make fibers, dyes and medicine. However, the marula tree is attacked by various diseases and pests. Of particular importance are the fruits which are attacked by fruit flies. Fruit flies cause extensive loses to various fruit tree species throughout the world, for example in Kenya, as much as 80% of mango yield have been lost to fruit flies. A lot of work has been done on the pest status and diversity of fruit flies on various cultivated fruits around the world but little has been done on indigenous fruit trees in Botswana. Thus this work was carried out to evaluate the pest status and diversity of fruit flics on marula trees in three localities (Gabane, Mochudi and Rasesa) in Botswana. Traps with four different parapheromones and a food bait were placed on 15 randomly selected marula trees in the three sites to study the fruit fly diversity. The traps were cleared once every two weeks to gather all the accumulated flics. Pest status of fruit flies on marula fruits was evaluated using three categories of marula fruits which were randomly selected. Fifteen to twenty fruits which showed symptoms of infestation, those without symptoms and fruits that fell to the ground under marula trees were collected to evaluate pest status of fruit flies in marula tree. Ten fruits randomly selected from each category and from each site were dissected to count the immature stages. Some fruits were also set up in the laboratory for fruit fly emergence. Five fruits from each category and from each site were set up for adult emergence. After emergence the adult fruit flies were fed on marula fruits until their natural colour developed fully. The adults were killed and used to identify the species of fruit flies that infest manila. A total of 3835 adults of 14 fruit fly species were collected from the sites from December 2009 to March 2010. The fruit fly species recorded from traps in this study were C. cosyra, C.9 capitata, C. rosa, C. pedesiris, C. quinaria, D. ciliatus, D. emi/tus, D. frontalis, D. fuscalus, D. percropsis, D.vertebratus, Coelotrypes species, Trirhithrum species and Isocania species

Présentation (BUANR)

Page publiée le 23 décembre 2022