Studies on Development of Resistance in Different Strains of Trogoderma granarium (Everts) to Phosphine Fumigation in Southern Punjab, Pakistan

摘要

The study was conducted to determine the response of different strains of Trogoderma granarium (Everts) to phosphine concentrations. Thepest was exposed to 200,400,600 and 800 ppm concentrations of phosphine gas in glass jars under control conditions following CRD, replicated four times along with a control treatment. The observations regarding percent mortality of grubs of T. granarium were recorded after 1,3,5,7 and 15 days of application of phosphine gas. The results revealed that maximum mortality of the pest was recorded to be 81.67 % in jars where 800 ppm concentration of the gas was applied 47.55,61.42 and 70.33% mortality was observed by 200,400 and 600ppm concentration. Shah Sadardin strain showed maximum mortaility（68.35%) followed by Tounsa Sharif strain (45.95) and D. G. Khan strain(43.60%).