Thuricide will only kill caterpillar pests that eventually become moths or butterflies. The material must be ingested by the caterpillars to be effective. I do not know what the "white worms" are that are attacking your strawberries. You may want to send a picture to get an accurate identification of the pest. If they are moth or butterfly caterpillars then yes, it should be effective, especially if applied when the caterpillars are relatively young. If not, then it will not work.