Yes sometimes will be fine. I mean it will not hurt. But there should be no need. But better to have the dust and not need it then to need it and not have it. If you have a good gut loading system and your crickets are eating the food which have the vitamins you give them then they should be getting all the nutrition they need. However crickets are very low in nutrition compared to other insects. you can gut load them with all sorts of good stuff but they will still not compare to earth worms or roaches. so with crickets i would recommend dusting but if you had dubia, or lateralis i would say not so much.