18 - in 
CEREAL AND FORAGE INSECTS 


. Drought and low soil moisture apparently unfavorable to parasites of 
- hessian fly:--Dissections of spring-yveneration puparia from various ex- 
perimental sources in the area around Wichita, Kans., by J. R. Horton 
indicate that the drier the soil the smaller the population of hessian 
fly parasites. For example, the parasitization during October, based on 
examination of 800 puparia from an irrigated and from a nonirrigated 
wheat plot, averaged 21.5 percent in the watered plot but only 11.3 per- 
cent in' the nonwatered wheat. The average cf all the examinations in 
these 2 plots for the period July-October, inclusive, was 12.8 percent 
puperia parasitized in the irrigated wheat, as compared with only 6.1 
percent in the nonirrigated wheat, or twice as much parasitization in the 
former. again, a very high paresitization, 70 percent of the pupsria, was 
found during Octeber at the Riverside plot, where the soil is almost con- 
stantly high in moisture content; whereas at the Upland plot, where the 
soil is subject to rapid drainage, drought apparently had destroyed all 
the puparia, and no dissections of spring-generation puparia could be made. 
_Dissections of fall-generatien puparia, however, continued to favor the 
foregoing theory in that 1.5 percent puparia from the Riverside plot were 
parasitized; whereas there was no pardsitization on the Upland plot, 

Hybrid wheat selections show fly resistance regardless of scant fly 
population.--E. T. Jones, Wichita, Kans., states that notwithstanding the 
general low hessian fly infestation this fall, hybrid selections sown for 
fly resistance tests have disclosed a fair degree of resistance. He 
bolsters this statement up with a showing of results from October ex- 
aminations of several fall-sowm selections. and their checks. These in- 
clude $ selections of Illini Chief X Blackhull Fe, Ziegler's Choice X 
Kenred Fs and Kanred X Ziegler's Choice Fe, together with common seed 
Kanred checks. Based on examination of 2,100 culms from 21 plots, the 
results show infestations ranging only from 0.3 percent to 1.2 nercent 
of culms in the various selections, wheress the average infestation of 
the checks is 3.8 percent. 
for this purpose. While these results are besed on only a single applica- 
tion of barium fluosilicate (80 percent) for each generation of borer, and 
While the first (and most important) application was made too lste 
expected from its use, properly applied, to produce small plots relatively 
free from the borer. The insecticide was used as a Spray in cne series 
and as a dust in another series. The results were rated in percentage of 
Stalks infested, borer population: per 100 Stalks, and percentage of stalks 
lodged by the borer. The sprayed corn was 56 plus or minus 2.4 percent 
