Vector Bionomics of Two Species of Chaetocnema (Coleoptera: Chrysomelidae) in Rice Yellow Mottle Virus Transmission in Lowland Rice in Tanzania

ABSTRACT Regular samplings of two important vectors in farmers' fields were made at crop stages susceptible to rice yellow mottle virus on a traditional rice variety (Supa) under rainfed lowland conditions to provide information on the dynamic nature of the disease and the bionomics and importance of vectors in the disease transmission. The population of an unknown Chaetocnema sp. was significantly higher in hotspot than non-hotspot areas. However, there was no significant difference in C. pulla Chapuis population between both areas. In general the unkown Chaetcnema sp. population was higher than C. pulla, and both vectors reached the peak of their population at 63 days after planting. Also, early planting in the hotspot areas is suggested as a disease management strategy.

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