(a)​ Give any three preventive measure for pest control. 
(b) ​How does storage of grains leads to losses? What preventive and control measures are used before grains are stored for future use?

a) Measures for pest control - *U can use pesticides .
    Usage of herbal pestcontrol . * A nd lastly there are rodents who kill pests and they can be controlled by keeping male ones out.
b) If the storage is not well maintained and is it has moisture , pests etc . The grains will spoil and get rot. Ensure that the silos are dry and no pest and rodent is found. Grains are also dried before storage. And cleanliness is maintained.