DDVP is broad spectrum insecticide. 
Navan having contact, stomach and fumigant action.
Its residual effects are very short, so it can be sprayed on vegetable crops barely two days before of picking the Vegetarian. 
Target crops  : Paddy,  crop etc.  Target pests  :  It kills sucking and chewing insecticides like, aphids,
tassids, thrips and leafminer, heliothis, spotted, bollworm, pinkbollworm etc.