Association of Bursaphelenchus sp. (Nematoda: Aphelenchoididae) with nitudulid beetles (Coleoptera: Nitidulidae).
Dauer juveniles of an undescribed Bursaphelenchus sp. were recovered from the median oviduct and ovipositor sac of adult females and the internal sac of males of Urophorus humeralis. In experimental studies where dauers were recovered from adult beetles only, Carpophilus hemipterus, C. mutilatus and U. humeralis were consistently associated with more dauers than Haptoncus luteolus or Stelidota geminata. Male C. hemipterus venerally transmitted dauers of Bursaphelenchus sp. to females in 33% of experimental crosses. Female to male transmission was not observed. Bursaphelenchus sp. dauers established themselves on Monilinia fructicola [Sclerotinia fructicola] cultures within 2 weeks from dead male or female C. hemipterus. Live female C. hemipterus contaminated fungal plates with nematodes. The transgenerational and horizontal transmission of Bursaphelenchus sp. by nitidulid beetles is discussed.