Fungicide resistance of Fusarium oxysporum f.sp. cepae isolated from shallot in Brebes

Abstract

Brebes, Central Java is the largest shallot centre in Indonesia. Shallot are planted intensively in this area. The most detrimental disease of the plants is moler caused by Fusarim oxysporum f.sp. cepae, FOCe. Fungicide applications are carried out periodically every 3-5 days. However, the disease severity is still quite high. There is even a tendency to increase every year. In addition, continuous use of the fungicides can cause adverse effects on the control itself, such as the emergence of fungicide resistance. Field testing aims to evaluate the effectiveness of fungicides against moler disease. Lab testing to evaluate FOCe resistance to fungicides. The fungicides used in this research are the fungicide Brands widely used by farmers in this area. The efficacy test results showed that the three Brands were not effective (efficacy below 50%). There are indications that FOCe is resistant to two merks of fungicides with active ingredients, Chlorothalonil and Propineb.