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  Fruits 73 (4) 218-227 | DOI: 10.17660/th2018/73.4.3
ISSN 0248-1294 print and 1625-967X online | © ISHS 2018 | Fruits, The International Journal of Tropical and Subtropical Horticulture | Original article

Seasonal abundance of fruit flies (Diptera: Tephritidae) on mango orchard and its relation with biotic and abiotic factors in Manica Province, Mozambique

L.D. Bota1,a, B.G. Fabião1, M. Virgilio2, M. Mwatawala3, L. Canhanga4, D.R. Cugala4 and M. De Meyer2
1National Fruit Fly Laboratory, Provincial Directorate of Agriculture and Food Security, Chimoio, Pigivite Road nr. 678, P.O. Box 42, Manica Province, Mozambique
2Royal Museum for Central Africa, Invertebrates Section & JEMU, Leuvensesteenweg 13, B-3080 Tervuren, Belgium
3Sokoine University of Agriculture, Department of Crop Science and Horticulture, Morogoro, Tanzania
4 Faculty of Agronomy and Forest Engineering, Eduardo Mondlane University, Maputo, Mozambique

SUMMARY
Introduction – Mango (Mangifera indica L.) is a fruit species with high potential for reduction of hunger and poverty in Mozambique. However, the production of this crop is currently threatened by various fruit fly species, including Bactrocera dorsalis (Hendel) and Ceratitis cosyra (Walker). Their occurrence in Mozambique needed to be assessed. Materials and methods – Fruit flies (B. dorsalis and C. cosyra) were monitored over two consecutive mango cropping seasons from September 2014 to August 2016 on 10 ha of a commercial mango orchard in Vandúzi district, Mozambique. Trapping activities were conducted using Chempac Bucket traps baited with food attractant (torula yeast). Temperature data and host phenology data were recorded at the orchard, while rainfall data were obtained from a meteorological station located 10 km away. Results and discussion – Fruit fly populations were present in the orchard over the entire trapping period (for B. dorsalis); or absent at some periods during vegetative stages of the mango (for C. cosyra). For both cropping seasons, the population of B. dorsalis peaked in January. For C. cosyra, the peak was observed in January of the first cropping season, while it was observed in November of the second season. The population of both species varied between the seasons, but in general B. dorsalis was more abundant than C. cosyra (average relative abundance index RAI = 0.814). The B. dorsalis population density had a positive relationship with minimum temperatures and mango phenology stages and a negative relationship with average temperatures, while the population of C. cosyra had a positive relationship with minimum temperatures. Conclusion – The populations of B. dorsalis and C. cosyra in Mozambique fluctuated throughout the cropping year, B. dorsalis was more abundant than C. cosyra with some periods of exclusive presence. This fluctuation seems well-related to biotic and abiotic factors.

Résumé
Abondance saisonnière des mouches des fruits (Diptera: Tephritidae) et relations avec les facteurs biotiques et abiotiques en verger de manguiers dans la province de Manica au Mozambique.
Introduction – Le manguier (Mangifera indica L.) est une espèce fruitière ayant un fort potentiel de réduction de la faim et de la pauvreté au Mozambique. Cependant, la production de mangues est actuellement menacée par diverses espèces de mouches des fruits, dont Bactrocera dorsalis (Hendel) et Ceratitis cosyra (Walker). Leur apparition au Mozambique doit être évaluée. Matériels et méthodes – Les populations de mouches des fruits (B. dorsalis et C. cosyra) ont été suivies pendant deux saisons de culture consécutives de septembre 2014 à août 2016, dans un verger de 10 ha de manguiers commerciaux dans le district Vandúzi, au Mozambique. Les activités de piégeage ont été menées à l’aide de pièges Chempac Bucket avec un attractif alimentaire (levure de torula). Les données de températures et les données phénologiques de l’hôte ont été enregistrées au verger, tandis que les données de précipitations ont été obtenues à partir d’une station météorologique située à 10 km. Résultats et discussion – Les mouches des fruits étaient présentes dans le verger pendant toute la période de piégeage (cas de B. dorsalis); ou absentes à certaines périodes pendant les étapes végétatives du manguier (cas de C. cosyra). Sur les deux saisons de culture, la population de B. dorsalis a atteint un sommet en janvier. Pour C. cosyra, le pic de population a été observé en janvier de la première saison de culture, alors qu’il a été observé en novembre de la deuxième saison. Les populations de chaque espèce ont présenté des variations selon les saisons, mais en général, B. dorsalis a été plus abondante que C. cosyra (indice d’abondance relative moyenne RAI = 0,814). La densité de population de B. dorsalis est en corrélation positive avec les stades phénologiques de la mangue et la température minimale, et en corrélation négative avec la température moyenne, tandis que la population de C. cosyra est en corrélation positive avec la température minimale au verger. Conclusion – Les populations de B. dorsalis et de C. cosyra au Mozambique ont fluctué tout au long de l’année de culture, B. dorsalis était plus abondante que C. cosyra avec quelques périodes de présence exclusive. Cette fluctuation semble liée à des facteurs biotiques et abiotiques.

Keywords Mozambique, mango, Mangifera indica, Bactrocera dorsalis, Ceratitis cosyra, population dynamics

Mots clés Mozambique, manguier, Mangifera indica, Bactrocera dorsalis, Ceratitis cosyra, dynamique des populations

Significance of this study

What is already known on this subject?

  • Bactrocera dorsalis is an invasive species of fruit fly in Africa and the most important, attacking a large number of hosts including mango.
    Ceratitis cosyra is a native species with mango as one of the most important hosts.
    After invasion, B. dorsalis is displacing C. cosyra in many East and West African countries.
What are the new findings?
  • Bactrocera dorsalis still coexists with Ceratitis cosyra in Mozambique after its invasion, but more abundant than the native species.
    Both populations fluctuate throughout the year, related to biotic and abiotic factors.
What is the expected impact on horticulture?
  • Understanding the relationship between population fluctuations and biotic and abiotic factors will allow anticipating the build-up of pest populations; and
    It can assist the growers in predicting population growth and taking precautionary measures.

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E-mail: luisbota@yahoo.com.br  

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Received: 2 February 2018 | Accepted: 16 May 2018 | Published: 23 July 2018 | Available online: 23 July 2018

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