Show points out advantage of gassing borers peach growers who gassed their trees it year ago with P D B treatment for the control of peach borers can economize by omitting the treatment this fall but all those who haye have not treated their trees for two or more years probably will be ahead by doing so at this season according to results of a survey made by S 0 handlir chandler handl cr entomologist of the illinois state natural history survey in co operation with the horticultural department part ment of the college of agriculture university of illinois the peach borer Is one of the hazards which has made the annual farm value of illinois peach crop vary enry from total failure to during the past 21 years every tall fall growers puzzle over whether or not they should economize by omitting the treatment data collected in the survey help answer the question for this year thirty orchards in the largest peach area of the state were covered only 02 per cent wormy trees a light infestation was found in ten orchards which had been treated with P D 11 at the end of the 1032 season in contrast per cent of the trees were In infested rested in ten orchards which were treated in 1931 or two years a ago go this was almost six times the Inre infestation station in orchards that were treated a year ago over 54 per cent of the trees were found Infest edIn edlin ten orchards which were last treated in 1140 or earlier or never treated at nil all |