Abstract
Abstract An effective formulated biopesticide for controlling sheath blight in rice was developed using three microbial antagonists (Bacillus megaterium, Bacillus subtilis and Aspergillus niger) isolated from the rice sheath. The efficiency of spore-based formulations of the above microbial antagonists was investigated and their effectiveness in controlling sheath blight was demonstrated. Application of talc-based formulations of individual antagonists and mixtures of the three antagonists as spray treatments or soil applications were effective in reducing the incidence by up to 45% at 27 days after inoculation of the pathogen of sheath blight and increased rice yield. The use of spores of a fungal antagonist (A. niger), in comparison to commonly used bacterial antagonists, is a novel feature of the present study. Optimum sporulation conditions of the antagonists for preparation of spore-based formulations and their commercially desirable features such as the ability to maintain spore viability in storage were also determined. Culturing in the synthetic replacement sporulation medium (SRSM-2) for 72 hours was the most effective for sporulation of the two bacterial antagonists while culturing in potato dextrose broth (PDB) for 7 days was the most effective for sporulation of the fungal antagonist. It was demonstrated that talc-based formulations of all antagonists, either in refrigerated storage (4°C) or at room temperature (28±2°C), were able to maintain greater spore viability over a longer period (>6 months) than spore suspensions. In view of the relatively shorter life spans of formulations based on vegetative cells, spore-based formulations have a distinct advantage in achieving longer-lasting control, especially under harsh field conditions.
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Claims 5
Claim · model-written summary
Talc-based antagonist formulations reduced rice sheath blight incidence by up to 45%.
- Taxon
- rice
Oryza sativae0 - Treatment
- talc-based formulations of individual antagonists and mixtures of the three antagonistse0
- Outcome
- incidencee0
- Direction
- reducinge0
- Value
- 45%e0
- Qualifier
- 27 days after inoculatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of talc-based formulations of individual antagonists and mixtures of the three antagonists as spray treatments or soil applications were effective in reducing the incidence by up to 45% at 27 days after inoculation of the pathogen of sheath blight and increased rice yield.”
Claim · model-written summary
Talc-based antagonist formulations increased rice yield.
- Taxon
- riceOryza sativae0
- Treatment
- talc-based formulations of individual antagonists and mixtures of the three antagonistse0
- Outcome
- rice yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of talc-based formulations of individual antagonists and mixtures of the three antagonists as spray treatments or soil applications were effective in reducing the incidence by up to 45% at 27 days after inoculation of the pathogen of sheath blight and increased rice yield.”
Claim · model-written summary
SRSM-2 culture for 72 hours was most effective for sporulation of the two bacterial antagonists.
Verbatim
e0“Culturing in the synthetic replacement sporulation medium (SRSM-2) for 72 hours was the most effective for sporulation of the two bacterial antagonists”
Claim · model-written summary
PDB culture for 7 days was most effective for sporulation of the fungal antagonist.
Verbatim
e0“culturing in potato dextrose broth (PDB) for 7 days was the most effective for sporulation of the fungal antagonist.”
Claim · model-written summary
Talc-based antagonist formulations maintained greater spore viability over more than six months than spore suspensions.
Verbatim
e0“talc-based formulations of all antagonists, either in refrigerated storage (4°C) or at room temperature (28±2°C), were able to maintain greater spore viability over a longer period (>6 months) than spore suspensions.”
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biocontrol · disease · Oryza sativa (rice)Positive and negative results
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See all 26 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.