Abstract. Widyantoro A, Hadiwiyono, Subagiya. 2020. Biological control of Fusarium wilt on banana plants using biofertilizers. Biodiversitas 21: 2119-2123. Fusarium wilt is an important disease of banana caused by Fusarium oxysporum f. sp. cubense (FOC). The FOC is a weak parasite that attacks many bananas whose conditions are weak such as nutrients. Therefore, controlling Fusarium wilt through fertilization is important so that bananas are not nutrient deficient which can cause plants to be susceptible to FOC. The research aimed to study the effect of biofertilizer applications on FOC suppression in planta. Seven treatments were tested on banana seedlings cv. Ambon Kuning under a completely randomized design: (i) no biofertilizer, (ii) carrier material of biofertilizer, (iii) comparative biofertilizer product, (iv) Azotobacter, (v) Azospirillum, (vi) Streptomyces and (vii) Bacillus. The present study showed that biofertilizer agents were antagonistic to Fusarium wilt. The results showed that biofertilizer agents had the potential to suppress the Fusarium wilt in planta. Streptomyces and Bacillus were the most effective in controlling the Fusarium wilt. Azotobacter and Azospirillum had not been able to prevent the incidence of wilt disease.
Garlic is the main commodity of farmers in Tawangmangu, Central Java. The superior variety in the area is Tawangmangu Baru. Unfortunately this variety is susceptible to garlic root rot caused by Fusarium oxysporum f.sp. cepae. The infection of this pathogen was increased by the presence of the nematode Ditylenchus dipsaci. Besides the loss due to single infection, this nematode can predispose garlic to be susceptible to garlic root rot disease. Therefore, population decrease of D. capsaci is important as a component of integrated control of the two pests. Environmentally friendly control is a priority now and in the future, including biologically, such as the application of mycorrhizae and orgnically such as organic fertilizers. This paper reports a decrease in the population of D. dipsaci in garlic cultivation with the application of mycorrhizae and organic fertilizers. This research was conducted on farmer’s land in Tawangmangu Karanganyar Central Java at an altitude of 1000 m asl and Andosol soil type. The results showed that mycorrhizae, compost, and husk charcoal could decrease the population of D. capsaci. The effectiveness of nematode population decrease in the single treatment of mycorrhizae, compost, and husk charcoal were 18.45, 42.14, and 27.56%, respectively. While the combination of the three treatments gave the highest effectiveness value, namely 48.52%.
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