Repellent and growth inhibitory impact of plant extracts and synthetic pyrethroids on three strains of callosobruchus chinensis L.

The present research work was conducted to evaluate the repellent and growth inhibitory effciency of fve plant extracts (azadirachta indica,melia azadirach,pegnum hermala,baryosma and zingiber offcinale) and three synthetic pyrethroids (bifenthrin,cypermethrin and deltamethrin) on three geographical populations of callosobruchus chinensis collected during 2013 from faisalabad,multan and nankana districts of punjab,pakistan. three concentrations of each plant extract (5,10,15 and 20%) and synthetic pyrethroids (0.01,0.02 and 0.03%) were evaluated in this study. we observed signifcant results with each treatment. for both repellent and growth inhibitory effects,a. indica and deltamethrin were most effcient among plant extracts and pyrethroids respectively. at highest dose rates,more than 90% repellency was recorded with both a. indica and deltamethrin. upto 80% progeny inhibition was caused by the extract of a. indica. while more than 50% population of c. chinensis was inhibited with deltamethrin. more pronounced results were obtained at high concentrations. plants were effective in order of azadirachta indica > melia azadirach > pegnum hermala > salsola baryosma> zingiber offcinale; whereas effectiveness of pyrethroids was in order of deltamethrin > cypermethrin > bifenthrin. the fndings of this research will be helpful in organic storage of pulses by integrating the reduced risk pesticides with plant extracts. © 2017 zoological society of pakistan.