BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 15 
10-percent emulsion per tree. This injury evidently resulted from 
the fact that the soil was unusually wet during the fall of 1950, 
when the applications were made, Since such conditions are occa- 
sionally encountered by peach growers applying the material, the 
injury that developed in 1950-51 appears sufficient to justify the 
withdrawal of recommendations of propylene dichloride emulsion 
for control of the peach tree borer. 
In experiments in Georgia with sprays, good results in reducing 
the borer infestation were obtained from DDT (50 percent) or ben- 
zene hexachloride (6 percent gamma isomer) at the rate of 8 pounds 
per 100 gallons of water applied to the trunk and lower part of 
large limbs of peach trees three times at 5-week intervals starting 
August 1, during the egg-laying period of peach borer moths. 
The results of experiments on peach nursery stock conducted in 
Georgia in 1951 indicate that benzene hexachloride alone or a combina- 
tion of DDT and parathion is more effective than parathion alone for 
preventing peach tree borer infestation in peach nursery stock. 
Field-plot experiments were performed in Indiana to test methods 
of controlling the lesser peach tree borer. Heavy reductions in 
numbers occurred when four spray applications were made at 21- 
day intervals, starting June 15, with either parathion (15 percent) 
at 3 pounds to 100 gallons or EPN (25 percent) at 2 pounds to 100 
gallons. Reductions in the number of applications or the concen- 
tration resulted in reduced control. Little or no control was obtained 
with lindane, dieldrin, or DDT. Single applications of post- 
harvest sprays did not reduce lesser peach tree borer injury. 
New Oriental Fruit Moth Parasites Reared 
Two new Chinese species of oriental fruit moth parasites, received 
through the California Citrus Experiment Station, were propagated 
successfully on the oriental fruit moth in small green apples during 
the year. Routine breeding and colonization were started. About 
42,000 of one species, Agathis n. sp., and 39,000 of the second species, 
Phanerotoma gi^aphoJ.'f/n/r Mues., were reared in 1951. Colonization 
of the two new Chinese species of oriental fruit moth parasites was 
for the purpose of establishing them to supplement native species. 
These new species, which have shown ability in attacking fruit-infest- 
ing stages of the fruit moth not now heavily attacked by the native 
species might prove to be highly valuable. North Carolina and Xew 
Jersey received a large proportion of all parasites available for libera- 
tion in 1951. The North Carolina Agricultural Experiment Station 
cooperated in making liberations in that State. There were 210 sepa- 
rate releases of about 26,000 P. grapliolithae and 178 releases of about 
21,000 Agathis n. sp. In addition, several thousand of these two spe- 
cies and Horogenes were sent to the California Citrus Experiment 
Station to colonize on the oriental fruit moth in Orange County. Calif. 
Spider Mites and Mealybug Controlled on Grapes 
Spider mites, Tetranychus ~bimacvl<tf>ix Harvey or T. atlanticus 
McGregor, on grapes were controlled effectively in Ohio by two ap- 
plications, 6 days apart, of a spray containing one-half pound of 15- 
percent parathion or 25-percent EPX, or 2 1 /> pounds of a DDT-para- 
227798—53 ?, 
