June, ’23 
snapp:plum curculio 
281 
and since an application of lead arsenate applied before the stone harden¬ 
ing period will not protect it from the curculio during the ripening 
period, peach growers in latitudes where only one generation of the 
curculio occurs annually may also find a lead arsenate treatment 
four weeks before harvest of value. In Georgia last season 17 per 
cent of the peaches harvested from a large plat were “wormy” where 
the arsenate of lead treatment four weeks before harvest was omitted, 
whereas the infestation from a large plat where the lead arsenate 
final treatment was applied as the fruit entered the ripening period 
was only 1.8 percent. The check in this orchard gave 23 percent 
“wormy” peaches. 
The ideal spraying or dusting schedule for the control of the plum 
curculio on peach in latitudes where there are two generations, consists of 
four treatments of arsenate of lead as follows: (1) immediately after the 
petals fall; (2) when the fruit is exposed from the calyx; (3) two weeks 
after the second; and (4) four weeks before each variety is due to ripen. 
This is the schedule that was recommended and so successfully used by 
the growers in Georgia during the past season, when one of the state’s best 
peach crops was produced. The lead arsenate was used at the rate of four 
pounds of the powder to the 200 gallon tank. Four applications of lead ar¬ 
senate at that strength is too much as an annual treatment for peach trees 
in the South. Some leaf margin bum resulted from the use of this schedule 
in a number of orchards in Georgia during the past season, and we ex¬ 
pected it when the schedule was recommended. Every known method 
was being utilized to correct Georgia’s abnormal curculio situation 
which was threatening the great peach industry in that state, and for 
that reason no hesitancy was made in recommending this schedule. 
No severe injury occurred from its use, however, in any orchard; and 
in any section of the South where the curculio infestation has been 
severe, or where it is expected to be bad this schedule mentioned cannot 
be improved upon and should be used. Its continued use year after 
year would perhaps eventually affect the productivity of the tree. 
Under normal curculio conditions in latitudes where two generations occur 
it would perhaps be better to omit the first or third application of the 
schedule mentioned, or make all four applications using three pounds of 
lead arsenate per 200 gallon tank instead of four pounds. These 
variations from the proven schedule, in order to reduce foliage burning, 
will be given special attention in the spraying and dusting experimental 
work in Georgia during the 1923 season. 
A detailed account of other interesting facts brought out as a result of 
