The decision is entirely up to you, because each marsh is very different, pest pressure varies from bed to bed. The feeding habits of the cranberry flea beetle is that they prefer Joe Pye weed, hardhack, beggar-ticks, Smarweed, jewel weed, Marsh St. John's wart, and when these weeds are not present we have observed them feeding on Cranberry. The flea beetle has one generation per year. When placed in the hand, beetles actually jump and can easily fly. The adults can be observed mid July and remain visible through August and sometimes into September.
Adults feed on both upper and lower leaf surfaces in a skeletonizing manner.
Feeding on some epidermal layers of the leaf causes the leaf to turn brown, and may result in upright dieback. August and early September the beetles are laying their eggs in the soil. The eggs are pale yellow, irregularly shaped, about mm long. The eggs over winter. They are creamy white in color with a brownish head.