Untersuchungen über den Anflug und die Brutentwicklung des gestreiften Nutzholzborkenkäfers, Trypodendron lineatum (Oliv.)

Studies on the flight and breeding of the ambrosia beetle, Trypodendron lineatum (Oliv.). I. Phenology and relations to the host tree. The first named author observed, under nearly natural conditions, the attack of Trypodendron lineatum (part I) and the development of its progeny (part II). As to the phenology, late attack flights could not be attributed to the local populations, but a satisfying explanation could not be given. — Attractancy and breeding suitability of a stem are not necessarily linked to each other. Attractancy depends upon the degree of seasoning but can be modified by other physiological factors and amplified by the emission of pheromones. Breeding suitability depends largely upon the “history” of the tree and the degree of seasoning in their relations to the time of attack.