Abundance and Spatial Dispersion of Rice Stem Borer Species in Kahama, Tanzania.
Bottom Line: Stem borers dispersion was aggregated along the edges of rice fields in three locations (wards) namely: Bulige, Chela, and Ngaya.The dispersion in the fourth ward, Kashishi was uniform as established from two of the three dispersion indices tested.Further studies would be required to establish the available alternative hosts, the extent of economic losses and the distribution of rice stem borers in the rest of the Lake zone of Tanzania.
Affiliation: Department of Crops, Lake Zone Agricultural Research and Development Institute (LZARDI), P.O. Box 1433, Mwanza, Tanzania.Show MeSH
Related in: MedlinePlus
Mentions: Three species of stem borers, C. partellus, M. separatella, and S. calamistis were recorded from all surveyed sites in the 20 farms assessed (Fig. 1). Of the four wards surveyed, C. partellus was highly abundant in Chela (70.7%) and Ngaya (56.8%) while M. separatella was highly abundant in Kashishi (58.9%) and Bulige (45.0%). S. calamistis was observed to be less important in Bulige, Kashishi and Ngaya. In Chela, S. calamistis (16.7%) was the second abundant species after C. partellus (Table 1).Fig. 1.
Affiliation: Department of Crops, Lake Zone Agricultural Research and Development Institute (LZARDI), P.O. Box 1433, Mwanza, Tanzania.