Physical control method
- Manipulation of physical factors like heat, cold, humidity, light and sound are used in this method.
- This method is applicable for the storage pest.
- It can be done by following ways:
a. Manipulation of Temperature:
I. Application of High temperature:
- Superheating of empty Godowns to the temperature above 50 0 C for 10-12 hours kill the hibernating stored grain pests.
- If cotton seed is exposed to 52 0 C for 5 min the hibernating larvae of pink boll worm will kill.
ii. Application of low temperature
- When stored grain pest is exposed to lower temperature below 5 0 C it kill the insects.
b. Manipulation of moisture:
- Optimum temperature and higher moisture is favorable for insect attack.
- Moisture of storage grain should be below 12% moisture.
c. Manipulation of light
- Many insects are attracting UV- rays 320-400 nm is range of visible for insects.
d. Manipulation of sound
- Male mosquitoes are attracted by special sound waves and made sterile by electronic flash gun in Canada.