Evaluating the effect of three plant leaf extract against German cockroach (Blattella germanica) survival under uncontrolled condition

Abstract

The present study was conducted to evaluate the efficacy of Phytolacca
dodecandra, Buddleia polystachya and Vernonia amygdalina leaf extract against
theadult German cockroach,Blattella germanicaunder uncontrolled condition by
comparingcontrol measures.The research consists of three botanical leaf extracts
were prepared by three concentration levels (5g/100ml, 10g/100ml and
15g/100ml of water), a positive control (deltamethrin)andnegative
control(Water), were laid out in a randomized complete design with three
replications. Total of 330 adult cockroaches were tested.Mortality of
cockroaches were recorded after 24, 48 and 72 hours of explosure. Data were
analyzed by using SPSS software package version 20.0.The results indicated
that all the botanical extract concentrations were significant for cockroaches
mortality.The mean mortality count of adult B. germanica was thehighest (100)
in 15g/100ml concentration of P. dodecandraand Possetive controland the
lowest (no mortality) in the negative control was recorded in 24 hours exposure
time.
Hundred percent (100%) of mortality were recored by P. dodecandra at 5g/100ml after 72 hours, 10g/100ml after
48 hours 15g/100ml after 24 hours and by B. polystachya and V. amygdalina at 15g/100ml after 48 hours. These
results were no significant differences with positive control. But, there was significant differencein mortality in both
increase in concentration levels and exposure time for all botanicals. Therefore, users use these easily prepared and
available botanicals to control/ eliminate cockroaches by by formulating 15g/100ml of water and more concentration
levels rather than using of synthesic pesticides to keep environmental polution.