Status of pine woolly aphid (pineus bocrneri?) in sao-hill forest plantation, Southern Highlands, Tanzania
| dc.contributor.author | Petro, Revocatus | |
| dc.date.accessioned | 2026-05-26T15:40:21Z | |
| dc.date.available | 2026-05-26T15:40:21Z | |
| dc.date.issued | 2009 | |
| dc.description | Masters Theses | |
| dc.description.abstract | The study on the status of Pine Woolly Aphid, (Pineus boerneri?) in Sao-Hill forest plantation, Southern Highlands of Tanzania was carried out between November and December 2007. The major objectives of the study was; to determine distribution and abundance of pine woolly aphid (PWA) affecting main plantation species (Pinus panda and P. elliottii) in the plantation, to assess intensity of damage between different age classes and to determine the parts of the tree crown mostly damaged and the extent of damage. The main findings of the study were; the population densities of adult PWA did not differ significantly (P > 0.05) for both P. panda and P. elliottii among the three Divisions studied. However, Division one was more affected by aphids than other Divisions with the mean total adult population number of 17.4, 16.5 and 13.6 for P. panda and 6.7, 6.3 and 6.1 for P. elliotlii for Divisions I, II and III respectively. The mean total adult aphid population was found to be 10.1, 20.2 and 17.3 for P. panda for young, middle and old age classes respectively. In P. elliotlii where only old class was observed, the mean total adult aphid was 19.1. In old age class, P. elliotlii was more affected than P. panda. The middle part of the tree crown was more damaged, followed by lower crown part and upper crown was the least damaged. There was a strong relationship between aphid abundances and damage among Divisions and age classes with coefficient of determination (R2) of 99.7% and 99.9% respectively. Generally the intensity of attack of aphids at Sao Hill forest plantation was low compared to the intensity of attack as reported by other authors in the early 1990s. This was probably due to the effect caused by predators like Tetraphleps raoi, a natural enemy which was released at Sao Hill in 1970s. Resistance of the pines as a result of adaptation to Sao Hill could also have contributed to the recorded low intensity of attack. It is recommended that; silvicutural operations should be regularly conducted in order to prevent any outbreak and spread of forest pests. The Government should initiate regular insect survey and monitoring programmes in the forest plantations and take prompt measures whenever the pests are observed. A study has to be done to determine the population dynamics of the pine woolly aphid. Both regional and international cooperation should be intensified in dealing with pine conifer aphids. | |
| dc.description.sponsorship | Belgian Technical Cooperation (BTC) | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/20.500.14820/7607 | |
| dc.language.iso | en | |
| dc.publisher | Sokoine University of Agriculture | |
| dc.subject | Pine woolly aphid | |
| dc.subject | Pineus bocrneri? | |
| dc.subject | Sao-hill forest plantation | |
| dc.subject | Southern Highlands | |
| dc.subject | Tanzania | |
| dc.title | Status of pine woolly aphid (pineus bocrneri?) in sao-hill forest plantation, Southern Highlands, Tanzania | |
| dc.type | Thesis |