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Periplaneta americana and Blattella germanica are pests of great importance in urban areas, mainly due to their role as vectors of pathogens and capability of causing allergies. The interspecific differences between these cockroaches can lead to different results in their control. No chemical (liqui...

The German cockroach (Blattella germanica) is host for several parasites. Due to the high population density in laboratory cultures of cockroaches, transmission rates of parasites as well as parasite prevalence can also be high. Cockroaches are important test organisms for efficacy testing of insect...

At 27 °C and 45% r.h., the Australian cockroach Periplaneta australasiae (L.) developed to adulthood in an average of 113 days for males and 121 days for females. Developmental times were longer for cockroaches in smaller groups, at 155 days for females and 152 days for males, than cockroaches in la...

German cockroaches occur in habitats that are generally warm and moist, and such abiotic conditions are also favorable for infection with entomopathogenic fungi. There is an increasing interest for the use of entomopathogens, particularly entomopathogenic fungi, for suppression of insect pests. We h...

An experimental 2.15% imidacloprid-based gel bait containing »44% water was evaluated in laboratory and field studies against the German cockroach, Blattella germanica (L.). In continuous exposure tests, toxicity and presumably bait consumption varied with cockroach stage, deprivation of competitive...

Cockroaches could represent one of the most important hygienic problems, since they can contaminate food with bacteria, transmit diseases and cause human allergies. For this reason, urban governments and food industries devote part of their balance to cover the cost of their control. One of the firs...

The ability of Aprostocetus (Tetrastichus) hagenowii (Ratzeburg) to find oothecae in plumbing chases infested with American cockroaches was evaluated using different release strategies for six weeks. This pilot study used forty-three plumbing chases. Chases were assigned one of four treatments (rele...

A focal point for pest management programs is often limiting the amount of insecticide to the minimum level while still maintaining the maximum benefit for population reduction. With that in mind we conducted a field study in 28 homes to evaluate the efficacy of applying insecticide to habitats iden...

The ability of mobile stages of oriental cockroaches to survive at -5C increased with acclimation at 10°C. Fully acclimated insects had LT5Os (time) of 1.3 - 4.1 days, depending on stage. A minimum of 8 days at - 5°C or 1 days at - 10°C was required to kill all stages; insects could survive for more...

In a laboratory study, groups of third instar Blatta orientalis nymphs were reared to adulthood in arenas containing fenoxycarb (48 mg ai/m2) treated ceramic or plywood tiles. The reproductive capacity of the emergent adults was assessed by pairing each individual with two untreated individuals of t...

Two mixed-age (semi-natural) populations of the Oriental cockroach Blatta orientalis were established in identical artificial domestic environments contained in steel freight containers. Each population was allowed a 10 week period of acclimation, during which the populations were monitored using Ro...

German cockroaches (Blattella germanica (L.)) are known to be susceptible to infection by the entomopathogenic nematode, Steinernema carpocapaue (Weiser) (Koehler el. al., 1992). Nematodes placed on moist filter paper in petri dishes (50 nematodes per cm2) killed all adult cockroaches after 3 days o...