Biological control of onion basal rot caused byFusarium oxysporum f. sp. cepae

Abstract

Basal rot disease of onion is caused by Fusarium oxysporum Schlechtend: Fr. f. sp. cepae (Hans.). Biocontrol agents were isolated from the rhizosphere soil of onion cultivated in different places of Tamil Nadu, India. Efficacy of various biocontrol agents was evaluated for the potential to manage the basal rot of onion in vitro. Among the tested isolates of Trichoderma sp., T. harzianum (TH 3) gave the greatest (83%) inhibition and Pseudomonas sp. (Pf 12) exerted significantly the greatest (75%) reduction of mycelial growth of F. oxysporum f. sp. cepae. Based on the laboratory analysis, effective biocontrol agents were evaluated in glass house and field conditions. Among the thirteen treatments tested in the field, the combination of bacterial and fungal biocontrol agents (Pf12 +Pf27+ TH3) gave significantly the greatest (85%) disease reduction. These biocontrol agents were useful as an alternative to chemical control of the onion basal rot and to enhanced growth and yield of onion.

Potential Bioinoculants for Sustainable Agriculture Prospected from Ferruginous Caves of the Iron Quadrangle/Brazil

“…Another widely used strategy to restrict Fo-induced damage is the use of resistant plant varieties [97]. However, this resistance is not stable over the long term [98], and because of the problems caused by such approaches, the use of bacterial isolates that act as antagonists to Fo as sustainable alternatives [76,[99][100][101], and the data from our work corroborate this perspective.…”

Fusarium basal rot: profile of an increasingly important disease in Allium spp.

“…A similar trial was conducted in India where FBR could be managed significantly (85%) by a mixture of T. harzianum (TH3) and Pseudomonas sp. (Pf12+ Pf27) isolated from the rhizospherical soil in naturally infected onion fields (Malathi 2015). T. harzianum KUEN 1585 (commercial product, Sim®Derma) has been shown to be effective in prevention and control of FBR in onion both in vitro and in pot experiments.…”

Effect of <i>Trichoderma asperellum</i> and <i>Trichoderma virens</i> on <i>Allium cepa</i> L. Growth, Damping off and Basal Rot Disease Incidence and Severity in Sri Lanka

“…to control Fusarium rot of lentil and found out both reduction of disease severity and growth enhancement. According to the investigation carried out by [37], onion basal rot caused by Fusarium oxysporum f.sp. cepa could be effectively controlled with soil amendment with Trichoderma spp.…”