Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz (1991) 64, 65-70
W. Stein and H. Haschemi (1991)
Der Einfluß von Außenfaktoren auf das Wanderverhalten der Deutschen Schabe, Blattella germanica (L.) (Blattodea, Blattellidae), in einer Mülldeponie
[The influence of external factors on the migration behavior of the German cockroach, Blattella germanica (L.), (Blattodea, Blattellidae) on a refuse tip]
Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz 64 (4), 65-70
Abstract: Mass propagation of the German cockroach in refuse tips may result in an increased emigration of this species into the surrounding area of the tip and thus in a heavy infestation of nearby buildings. Therefore, knowledges about the migration behavior are important when refuse tips are managed or projected.
The influence of several environmental factors (as sun, day time, wind, temperature, season, light intensity) on the running behavior of the German cockroach was investigated under outdoor conditions. The most important results are as follows:
1) The reaction of young larvae (especially of L1 and L2) on the investigated factors differs considerably from that of older larvae and adults. As the young larvae do not emigrate, their behavior can be neglected in respect to the questions discussed here.
2) During sunshine, the position of the sun is primarily responsible for the direction of the migration. The highest percentage of the cockroaches walks directly towards the sun or a few grade right and left from the sun. When the sun is covered by clouds, the variation in the running direction is very high and many cockroaches migrate even into the direction opposite to the sun.
3) From morning to evening, the main migration direction is shifting from east to west, following the position of the sun.
4) Wind direction (at speeds of less than 5 m/sec.) and temperature (within the activity range of the cockroaches from approximately 18 to more than 30°C) have no recognizable influence upon the migration direction.
5) The clearest reaction of the running cockroaches towards the position of the sun was noticed during the main migration-time in the year (June and July).
6) The results of these investigations confirm former findings made in the field during a mass emigration of the German cockroach from a refuse tip.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Link to article at publishers website
Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology
Pest and/or beneficial records: