Banana weevil and nematode distribution patterns in highland banana systems in Uganda: Preliminary results from a diagnostic survey
1994
Speijer, P.R. (IITA, Kampala (Uganda)) | Kashaija, I.N. | Karamura, E.B. (Kawanda Agricultural Research Institute, Kampala (Uganda))
The banana weevil, Cosmopolites sordidus, and a complex of plant parasitic nematodes have been reported as major constraints resulting in declining banana production in Uganda. This paper presents preliminary results from an on-going diagnostic survey on weevil and nematode incidence and damage in Uganda. Banana weevil tunneling of plant rhizomes was severe up to 1400 m asl; damage appeared negligible above this elevation and the weevil was not present above 1700 m asl. Root necrosis, primarily caused by plant parasitic nematodes, was more severe at lower altitudes between 100 and 1100 m and at higher altitudes above 1300 m asl. The relationship between root necrosis and elevation may have been influenced by species range which, in turn appears to be delimited by elevation. Plant toppling, due to nematode and possibily weevils was estimated at 7. Toppling was more severe between 1000 and 1100 m asl, coincident to areas where weevil and nematode incidence was highest. Plant snapping was less common with an estimated bunch loss of 1
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