Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz (1994) 67, 25-30

H. Haschemi (1994)
Studies on the cold-tolerance of different strains of the German cockroach, Blattella germanica (L.) (Blattodea, Blattidae) under laboratory conditions
Anzeiger für Schädlingskunde, Pflanzenschutz, Umweltschutz 67 (2), 25-30
Abstract: In laboratory investigations, 5 strains of the German cockroach, Blattella germanica, with different origin were tested in respect to their cold tolerance at 0, 5, and 10°C, respectively. The most important results are:
An out-door strain of a refuse tip was most tolerant to low temperatures. This ist not surprising, as in other investigations this strain could be observed overwintering in the field outside of the tip.
When this strain was kept in the laboratory for 8 years at 22-30°C and 60% r.h., the cold hardiness was reduced markedly.
Strains from a bakery, from the subtropical area of Turkey, and a strain, resulting from a crossing between the outdoor and the Turkey strain, were considerably less tolerant to low temperatures.
When eggs were kept under low temperatures, the hatching larvae showed a distinct better cold tolerance and were able to complete their development at field temperatures.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Blattella germanica		Germany
	Blattella germanica		Turkey