Browsing by Author "Madoffe, Seif S."

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    Impact of Eucalyptus gall wasp, Leptocybe invasa infestation on growth and biomass production of Eucalyptus grandis and E. saligna seedlings in Tanzania
    (Taylor & Francis, 2015) Petro, Revocatus; Madoffe, Seif S.; Iddi, Said; Mugasha, Wilson A.
    A study was carried out to determine the impact of Leptocybe invasa infestation on growth and biomass production of Eucalyptus grandis W. Hill ex Maiden and E. saligna Smith seedlings in Tanzania. Three- month old seedlings were infested with L. invasa. Twenty two weeks post infestation, heights of infested E. grandis seedlings were reduced by 39.6%, while diameters were reduced by 11.3% compared to uninfested seedlings. On the other hand, the heights of infested E. saligna seedlings were reduced by 38.2% and diameters were reduced 7.7% compared to uninfested seedlings. Dry weight biomass reduction of infested seedlings was significantly higher on stem and leaves than roots and branches of both E. grandis and E. saligna. The impact of L. invasa infestation on growth and biomass production was higher in E. grandis than E. saligna. Prevention and control of L. invasa infestation should be given priority. Similar future trials should examine other commercially grown Eucalyptus species in Tanzania.
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    Infestation densities of the pine woolly aphid (pineus pini) on pinus patula as related to site productivity at Sao hill forest plantation
    (Sokoine University of Agriculture, 1990) Madoffe, Seif S.
    Between September carried out Sao at Hill 1989 March, and 1988 a plantation forest study was with the following major objectives - to examine the relationship between Pinus patula stand productivity and abundance of the Pineus pini. - to elucidate the impact of P. pini on tree growth. Based on a preliminary main the sampling, sampling intensity was determined for a fixed degree of precision. In the main sampling, the two site classes I and III and the young class age compartments 100 infested sampled were classes. In each (<10 years) in compartment, trees had sampled. Three were each the of two site continued until sampling been recorded. For each infested tree, a 10 cm long twig was pruned from the middle crown crawlers and adult aphids were observed and whorl. Eggs, counts made under a dissecting microscope. In the main sampling, the two site classes I and III and the young class age compartments 100 infested sampled were classes. In each (<10 years) in compartment, trees had sampled. Three were each the of two site continued until sampling been recorded. For each infested tree, a 10 cm long twig was pruned from the middle crown crawlers and adult aphids were observed and whorl. Eggs, counts made under a dissecting microscope. An infestation experiment growth impact of P. was established to elucidate pini infestation on young P. patula seedlings after 24 weeks of growth. The main findings of the study were that:Population densities were higher in trees of poor sites compared to trees of infested trees were good sites. equally The percentages high of at both good-