Development of formulation of fluorescent pseudomonads and its evaluation on bio-management of blast of rice

Abstract

Fluorescent Pseudomonads (Pseudomonas fluorescens and P. putida) were formulated in talc, bentonite, palm oil and coconut oil for the management of blast disease of rice. The formulated products showed promising shelf-value. The formulated products were evaluated by root dipping of rice seedlings and foliar spray followed by inoculation with M. oryzae in pots. All growth parameters, yield parameters, incidence and severity of blast or rice were significantly influenced at every growth stage of rice. Yield contributing parameters were increased significantly giving the highest benefit cost ratio (BCR) compared to untreated control. Among the treatments, T₁₁ (10% BdPf-8 Talc) and T₁₃ (1% BdPf-8 Palm Oil) gave the highest yield 5.18 t/ha and 5.13 t/ha with the highest BCR 2.10 and 2.08, respectively. A negative correlation was observed among vegetative parameters, disease incidence and disease severity. Pseudomonas fluorescens (BdPf-8) can be a potential candidate for commercial production for controlling blast or rice.

Keywords:

• Formulation
• pseudomonads
• shelf-life
• rice blast
• management

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study was jointly funded by the Ministry of Science and Technology (MoST) for awarding National Science & Technology (NST) fellowship for the first author and the Ministry of Education (MoE), The peoples’ Republic of Bangladesh for awarding research fund (Project no. 2018/504/MoE - LS 2017357).