Report 
  Title  
  HYDRAMETHYLNON BAITS AND STICKY TRAPS AND BLATTELLA GERMANICA (L.) (DICTYOPTERA: BLATTELLIDAE) BEHAVIOUR
  Key Words  
  Behavioural resistance, cockroach behavior
  Author  
  FRANTISEK RETTICH
  Abstract  
  During the first two days of laboratory trials, catches on sticky traps (Ekolex-V) of the German cockroach (Blarrella germmica) were higher than those of subsequent days. In the case of sexed groups of adults, catches of the first and second days ranged from 14.2 to 28.3%. Consecutive daily catches then decreased to 0-16.3%.The cohorts of adults, once subjected to the effect of daily catching on sticky traps, seemed to be more cautious to enter them than those never exposed to traps. In the laboratory ascertained LTso values for B.gerrnanica adults for hydramethylnon bait stations (COMBAT@) ranged from 3.2 to 4.5 days, LT90 from 4.2 to 7.6 days.No distinct differences in LT50 LT90 and LT99 for groups of males never exposed to sticky traps (a) and for those exposed to traps (b) before bait application were found. However, LT90 and especially LT99 values for females of groups (b) were distinctly higher than those of groups (a). In the field trial B.germanica was effectively reduced by hydramethylnon bait stations.In a 6-12 (A.T.) week period the reduction ranged from 81.1 to 91.0%. After replacing bait stations by hydramethylnon gel formulation (MAXFORCE@), reduction of the cockroach population increased to 97.8%.