| || || Macanawai, Apaitia Ravaga|
| || || Investigations into the epidemiology of Taro Bacilliform virus in Samoa|
Author:Macanawai, Apaitia Ravaga
Institution: The University of the South Pacific
Subject: Taro | Diseases and pests | Samoa, Taro | Diseases and pests | Control | Samoa
Call No.: SB 608 .T26 M23 2002
Copyright:10-20% of this thesis may be copied without the authors written permission
Abstract: An investigation into the epidemiology of taro bacilliform virus (TaBV) in Samoa was conducted during 2001. Field surveys for incidence of TaBV on taro revealed that the virus occurs on both Upolu and Savaii Islands. This shows that this virus is currently more widespread than was reported in an earlier study. Seed transmission study demonstrated that TaBV is seed-borne and also transmitted by seeds and pollen on taro plants. Transmission of TaBV from infected to healthy taro was achieved using the mealybug Pseudococcus solomonensis Williams. Thirty-three percent of healthy taro plants exposed to viruliferous mealybugs developed typical TaBV symptoms after inoculation feeding. This was the first recorded occurrence of this mealybug species in Samoa and the first record of this mealybug as a vector of TaBV. In a field survey for alternative hosts for TaBV, a weed plant Commelina benghalensis L. was found to host the virus. TaBV-like symptoms were also observed on Xanthosoma sp. and Alocasia macrorrhiza in the field. A preliminary transmission study with mealybugs further demonstrated that Xanthosoma sp. and Alocasia macrorrhiza are host plants for TaBV.