Disease intensity of moler and yield losses of Shallot cv. Bima caused by Fusarium oxysporum f.sp. cepae in Brebes Central Java

Abstract

Brebes Central Java is one of the central production of shallot in Indonesia. In the latest years, shallot farmers in Brebes face a new problem in their production, that is the increasing attack of Fusarium oxyspsorum f.sp. cepae (FOCe) which causes Moler disease (MD). Based on a previous survey of respondents, the most common variety planted by the farmer in Brebes was cv Bima that had disease intensity up to 60% with yield losses over 40%. The field data related to disease intensity and yield losses caused by the pathogen are still very limited. This paper reports the occurrence of disease intensity of MD and its correlation to yield losses based on the primary data that was collected through a direct assessment on the field of shallot plantings in Brebes. The results show that the disease intensity of MD varies from 0 to 75% which significantly affects yield losses. Yield losses of same shallot plantings are over 50%.