Action of amorphous silica dusts on the German cockroach Blattella germanica (Linneaus) (Orthoptera: Blattidae)

1990 ◽  
Vol 80 (1) ◽  
pp. 11-17 ◽  
Author(s):  
G. N. J. Le Patourel ◽  
J. J. Zhou
Keyword(s):  
Relative Humidity ◽  
Adsorption Capacity ◽  
Adult Male ◽  
Amorphous Silica ◽  
Free Water ◽  
Blattella Germanica ◽  
German Cockroach ◽  
Oil Adsorption ◽  
Cockroach Blattella Germanica

AbstractAdult male German cockroaches were exposed to deposits of amorphous precipitated and pyrogenic silicas in continuous and discontinuous contact bioassays. LC50S of precipitated silicas in the former case generally increased with oil adsorption capacity of the dusts; variability in response in discontinuous contact bioassays was apparently due to grooming of appendages following pick-up of dust aggregates. The toxicity of silica deposits in half-treated choice boxes varied with relative humidity and was effectively eliminated at 95% r.h. or when free water was provided. Cockroaches accumulated in the untreated side of the box irrespective of r.h.; the mechanism of this effect is discussed.

German Cockroach, Blattella germanica (L.) (Blattaria: Blattellidae), Feeding Activity in Apartment Kitchens

2006 ◽  
Vol 41 (1) ◽  
pp. 49-56
Author(s):  
Brett D. Sedenger ◽  
Daniel R. Suiter ◽  
Gary W. Bennett
Keyword(s):  
Relative Humidity ◽  
Light Intensity ◽  
Human Activity ◽  
Low Income ◽  
Feeding Activity ◽  
Blattella Germanica ◽  
German Cockroach ◽  
Proximity Sensor ◽  
Cockroach Blattella Germanica

German cockroach, Blattella germanica (I), distribution within two low-income apartment kitchens was determined by monitoring feeding activity with capacitive proximity sensors for four consecutive days. Six sensors were placed in each kitchen in the cabinets below and above the sink, beside the stove, behind the refrigerator, on the counter and on top of the upper cabinet. In both apartments, cockroach feeding activity was as follows: in the cabinet below the sink > beside the stove = behind the refrigerator > in the cabinet above the sink = on the countertop next to the sink = on top of the upper cabinet. Environmental loggers that recorded light intensity, relative humidity and temperature were placed beside each proximity sensor. Areas with the greatest feeding activity were dark and humid. Areas of less feeding activity were most often well-lit, dry, and exposed to human activity.

Origin and Extent of Resistance to Fipronil in the German Cockroach, Blattella germanica (L.) (Dictyoptera: Blattellidae)

2003 ◽  
Vol 96 (5) ◽  
pp. 1548-1558 ◽  
Author(s):  
Glenn L. Holbrook ◽  
Jamie Roebuck ◽  
Clyde B. Moore ◽  
Michael G. Waldvogel ◽  
Coby Schal
Keyword(s):  
Blattella Germanica ◽  
German Cockroach ◽  
Cockroach Blattella Germanica
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