About Lesson
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 of pests.
- It can be done in following ways:
- Manipulation of Temperature:
I. Application of High temperature:
- Superheating empty Godowns to a temperature above 50 0 C for 10-12 hours kills 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 temperatures below 5 0 C it kills the insects.
2. Manipulation of moisture:
- Optimum temperature and higher moisture areas are favorable for insect attack.
- Moisture of storage grain should be below 12% moisture.
3. Manipulation of light
- Many insects are attracting UV- rays 320-400 nm is a range of visible for insects.
4. Manipulation of sound
- Male mosquitoes are attracted by special sound waves and made sterile by electronic flash guns in Canada.