Sokoine University of Agriculture

Effects of weaver ants on fruitfly and disease-inflicted postharvest losses of oranges in small-scale farming in Tanzania

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dc.contributor.author Msogoya, T.J.
dc.contributor.author Mamiro, D.P.
dc.contributor.author Mtui, H.D.
dc.date.accessioned 2017-12-08T11:41:03Z
dc.date.available 2017-12-08T11:41:03Z
dc.date.issued 1998
dc.identifier.issn 0856 668X
dc.identifier.uri http://www.suaire.sua.ac.tz/handle/123456789/1850
dc.description Tanzania Journal of Agricultural Sciences 2015, Vol. 14(2): pp 101-105 en_US
dc.description.abstract The objective of this was to evaluate the effect of African weaver ant (Oecophylla longinoda) on fruit fly disease-inflicted postharvest losses of oranges in small-scale farming in Coast region, Tanzania. The treatments consisted of weaver ant population estimated based on the number of nests (0, 2, 5 and 8) of weaver ants per tree and each was replicated three times. Orange fruits were randomly picked from farmers’ orchards at color breaker stage and were immediately transported and placed on benches in a postharvest laboratory at Sokoine University of Agriculture with average temperature of 19 and 28 °C during the night and day, respectively. Data were subjected to analysis of variance using GenStat Statistical Programme 12th Edition and treatment means separation was conducted based on LSD test at P ≤ 5 %. Results indicated that the incidence of fruit fly infection in orange fruits significantly (P < 0.05) decreased from 0.8 to 0.4 % as weaver ant population increased from 0 to at 2 nests per tree and the average number of pupae per fruit decreased from 0.58 to 0.04, respectively. Similarly, orange fruit decays significantly (P < 0.05) decreased from 20.4 to 10.2 % as weaver ant population increased from 0 to 2 nests per tree. Specifically, the incidence of decays due to anthracnose (Colletotrichium gloeosporioides Sacc.) decreased from 11.1 to 7.8 % and that caused by green moulds (Penicillium italicum Wehmer) decreased from 9.3 to 2.4 % as weaver ant population increased from 0 to 2 nests per tree. It is concluded that two nests of weaver ants per tree is an optimal population for substantial reduction of orange postharvest losses caused by fruit fly and fungal infections. The use of weaver ants can find wide applications in organic farming and small-scale orange farming where pesticide application is unaffordable. As the number of weaver ants per nest may differ, further studies are recommended to determine the actual number of weaver ants that can effectively reduce fruit fly and disease-inflicted decays, particularly in small-scale mixed cropping systems. en_US
dc.language.iso en en_US
dc.subject African weaver ants en_US
dc.subject Fruit flies en_US
dc.subject Decays en_US
dc.subject Oranges en_US
dc.subject Tanzania en_US
dc.title Effects of weaver ants on fruitfly and disease-inflicted postharvest losses of oranges in small-scale farming in Tanzania en_US
dc.type Article en_US


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