a6 he 
melanoscelus Ratz. from 1 identified hest; and Meteorus versicolor Wesm, 
from 2 identified hosts. Mr. Schaffner states further that "Compsilura 
has also been recovered from a few microlepidoptera and several species 
belonging under the superfamily Tenthredinoidea." 
Dosage of spray determined for gipsy moth.--"During the last few 
years," reports C. EB. Hocd, Melrose Highlands, "wocdland plots, usually 
infested with the gipsy moth, have been sprayed at the rate of 2, 3, 4, 
and 5 pounds of lead arsenate to 100 gallons of water, both with and 
without fish oil as an adhesive. In a number of these plots, mats were 
placed and the number of deed larvae on them counted and recorded, also 
the degree of defoliation and control noted. Graphs have been made 
from the results secured and it has been found that 4 pounds of leed 
arsenate to 100 gallons of water gave as gocd results as 5 pounds of 
lead arsenate to 100 gallons of water. In the plots where the “larvae 
were in the first and second stages at the time of spraying, 5 pounds 
of lead arsenate to 100 gallons of water gave very gocd results, 90 
to 95 per cent of the larvae being decd in 6 to 7 days. In the later 
stages 4 pounds of lecd arsenate to 100 gallons of water seemed suffi- 
cient to give gocd control." 
CEREAL AND FORAGE INSECTS 
sr larvae heavy.--L. H. Patch, of the European 
corn borer sublaboratory, Sandusky, Ohio, reports: "Upon becoming full-— 
fed, numbers of corn borers migrate from their host plants, beginning 
about August 15. In 1927 16.8 per cent of the borer population” ila 
sweet corn field were missing on October 20, as compared to the popu- 
lation on August 20. As a mean of the four years, 1925 to 1928, there 
were 1E.6 per cent fewer borers present in a large number of fields 
on September 25, as compared to numbers on August 31. In 1931, 17.35 
per cent fewer borers were present in the stalks of 24 strains of dent 
corm on September 28 than on August 20. But there was 2a wide range 
in the extent of migration from the individual strains. From 5° ofthe 
strains from 0 to 10 per cent of the original borer population migrated; 
from 11 strains, from ll to 20 per cent; from 7 strains, from 2) Wome 
per cent; and from 1 strain, 40 per cent of the borers migrated between 
August 20 and September 28. Moreover, the larger part of the migration 
occurred in the pericd between August 20 and September 3 where the corn 
veS planted early. The mean planting date of one-half of the plants of 
the 24 strains was May 8, and of the other half, May 22. A greater per— 
centage of the borers migrate from the most heavily infested strains than 
from the least infested. From 12 strains averaging 6.6 borers per plant 
14.6 per cent of the borers migrated between August 20 ard September 28, 
whereas from 12 strains averaging 10.3 borers per plant 20.4 per cent 
of the borers migrated." 
Migration of corn bor 
Field conditions in northwestern Ohio favor corn borer increase.—— 
"The most striking feature in this region," according to K. W. Babcock, 
