Bio-controls - when are they effective ?

[Mr Jay]

Yes, study involves housefly, fruitfly.
Focus is on temp and humidity.

Paper would imply that this particular product is incredibly ineffective below certain temperatures and below specific humidity.

Effect of temperature and humidity on pathogenicity of native Beauveria bassiana isolate against Musca domestica L - PMC

Beauveria bassiana HQ917687 virulence to housefly larvae and adult was assessed at different relative humidity, RH (50, 75, 90, and 100 %) and temperature (15, 20, 25, 30, 35, 40, 45 °C) conditions at the fungal dose of 108 conidia/ml. Depending on ...

pmc.ncbi.nlm.nih.gov

relative humidity of 50 % showed less than 50 % mortality of adult flies at all the tested temperatures
- At 75 % RH, maximum housefly adult mortality was 72 %
-which increased to 100 % mortality at 90 %RH

 

[Mr Jay]

I understand that we are typically not targeting houseflies.

Speaking generally, as a rule of thumb:
At temperature above 25 Celsius -relative humidity is equal to killing power.

The study plots a linear relationship.
At 50%, you will kill half of them.
At 100%, you can kill them all