Möglichkeiten zur Altersbestimmung von Larven des Getreidelaufkäfers (Zabrus tenebrioides Goeze).

Abstract

Measurements of the length and breadth of the head capsule and the length of the body of larvae of the corn ground-beetle (Zabrus tenebrioides Goeze) brought the following results: The much discussed fourth larval stage was not found in the larvae under examination. The breadths of the head capsule are distributed among the different stages as follows: L1: 1,09 to 1,29 mm; L2: 1,57 to 2,0 mm; L3: 2,57 to 3,14 mm. The data for the lengths of the head capsule are: L1: 0,57 to 0,74 mm; L2: 0,77 to 1,06 mm; L3: 1,40 bis 1,66 mm. Apart from the laborious measurements of the head capsule, simple determinations of the length of the larvae also allow a delimitation of the different larval stages sufficient for practical requirements The following classification is suggested: L1:< 11,5 mm; L2: 11,6 to 21,0 mm; L3:> 21,0 mm.