Chalkbrood (chalkbrood in cells)
Diseased larvae can be found throughout the brood-rearing season, but are most prevalent in late spring when the broodnest is rapidly expanding. Affected larvae are found on the outer fringes of the brood nest where insufficient nurse bees are available to maintain an elevated brood nest temperature. Brood cells can be either sealed or unsealed. Young pupae or recently sealed larvae are most susceptible. House bees often puncture or remove cappings.