Selective Medium for Quantitation of Bacillus popilliae in Soil and in Commercial Spore Powders

Area of Science:

• Microbiology
• Agricultural Science
• Entomology

Background:

• Bacillus popilliae is an important entomopathogenic bacterium.
• Accurate quantification of B. popilliae is crucial for its application in biological control of Japanese beetle larvae.

Purpose of the Study:

• To develop a selective and effective medium for the isolation and quantification of Bacillus popilliae.

Main Methods:

• A modified MYPGP agar medium supplemented with vancomycin was formulated.
• The selectivity of the medium was tested using various bacterial strains, including B. popilliae from Japanese beetle larvae.
• The medium's utility for spore quantitation was assessed in commercial spore powder and soil samples.

Main Results:

• The MYPGP agar supplemented with vancomycin demonstrated high selectivity for Bacillus popilliae.
• The medium was particularly effective for strains originally isolated from Japanese beetle larvae.
• Successful quantitation of B. popilliae spores was achieved in both commercial spore powder and soil.

Conclusions:

• The developed vancomycin-supplemented MYPGP agar medium is a valuable tool for the selective isolation and accurate quantification of Bacillus popilliae.
• This medium can facilitate research and application of B. popilliae in pest control strategies.