Browsing by Author "Petro, R."

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    Addressing pest and disease challenges in the national forest plantations: lessons learned from the national forest health forum
    (Tanzania Forest Fund (TAFORI), 2018-10) Petro, R.; Ndomba, O. A.; Bakengesa, S.; Chamshama, S. A. O.; Chidege, M.
    This paper presents the results of the work carried out by the National Forest Health Forum (NFHF), which covered five National Forest Plantations: Mbizi (Sumbawanga), Meru/Usa (Kilimanjaro), Meru (Arusha), Shume (Tanga) and Sao Hill (Iringa) for the period of five years (May, 2012 - July, 2017). The problems addressed are diseases caused by pathogens and those caused by inadequacies of various requirements from the soils. Many of the diseases have been soil-borne which gave rise to foliar symptoms, with Armillaria root rot being in the lead. Occasionally, the ravage by insect pests was encountered at Sao Hill and Meru Forest Plantations. These problems threaten the productivity of the plantations against the objective for the plantations of supporting the much needed industrialization process. To a large extent, these problems which were recorded in the visited plantations were noted to be accelerated by two phenomena namely; climate change and taungya. Therefore, this paper describes the problems addressed in the plantations; the steps adopted in addressing them, key findings and recommendations for achieving better plantations.
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    Infestation Density of Eucalyptus Gall Wasp, Leptocybe invasa Fisher and La Salle (Hymenoptera: Eulophidae) on Five Commercially Grown Eucalyptus Species in Tanzania
    (Taylor & Franci, 2014) Petro, R.; Madoffe, S.S.; Iddi, S.
    This study explores infestation density of Leptocybe invasa on five commercially grown Eucalyptus species in Coastal, Plateaux, and Southern Highlands agroecological zones of Tanzania. Infestation density between agroecological zones, Eucalyptus species, age classes and tree crown parts, relationship between stand altitudes and the magnitude of infestation, damage index, species age, and abundance of L. invasa on different Eucalyptus species were examined. There were significant differences in infestation between zones and Eucalyptus species. Eucalyptus tereticornis was more affected, followed by E. camaldulensis, andE. saligna was the least while E. grandis and E. citriodora were not affected. No significant differences in damage between different crown parts were observed.Treeswithageof1–3yrweredamagedmorethanthoseof age 4–6 yr. Pest infestation increased with an increase of L. invasa abundance but decreased with an increase of altitudes. Control efforts needs to focus on controlling the spread of the pest, using silvicultural methods and planting resistant Eucalyptus species.