Answer :

Fumigation is comparatively a safe and economical option of pest control than spraying of stored grains due to following reasons:

(i) In fumigation, the worker does not come in contact with the fumigant. There is some contact with the pesticide during spraying. In spraying, the worker suffers irritation in eyes, nose, vomiting, etc.

(ii) No residue persist over articles as it penetrated deep in fumigation. In spraying some residue can enter the sprayed articles.

(iii) Fumigants are volatile while sprays are seldom volatile.

(iv) Fumigation disinfects the whole areas spraying disinfects only the sprayed articles.

(v) In fumigation less amount of pesticide is used. While in spraying, large volume of pesticide is consumed.

(vi) Example of fumigants are aluminium phosphate, EDCT and methyl bromide. Pesticides which are sprayed include BHC, malathion and pyrethrum.

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