Abstract
A study on the prevalence of Nosema bombycis infection in field populations of diamondback moth, Plutella xylostella L., was conducted in October 1998 and April 1999. There was a significant difference in the percentage of Nosema infection and mean infection intensity among diamondback moth larvae or pupae sampled from the Cameron Highlands and Serdang-Gombak, each representative of high- and lowland cabbage-growing areas in Malaysia. The percentage of infection on diamondback moth larvae in Cameron Highlands was significantly higher than that in Serdang-Gombak in both sampling periods (seasons). The possible factors causing prevalence of disease infection are discussed.
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