The answer is d) all of the above. Preventive and control measures for grain storage include strict cleaning, proper disjoining (which is incorrect, it should be drying), and fumigation. Fumigation involves using chemicals to kill pests in the storage area.
Explanation:
Strict cleaning:
Ensures that grains are free from debris and contaminants that can attract pests or promote spoilage.
Proper drying (not disjoining):
Reducing the moisture content of grains is crucial to prevent the growth of mold and fungi, which can spoil the grains and also attract insects.
Fumigation:
Involves using gaseous pesticides to kill pests within the storage area or on the grains themselves, preventing infestation.