Reporting on studies of the clover seed chalcid at Tempe, Ariz., 
V. L. Wildermuth says: "Field sweepings have been continued at intervals 
throughout the month with a view of keeping a check on the relative per-— 
centage on different parasitic species as compared with the numbers of 
host insects and to determine the distribution of males and females of 
each. Binocular examinations, made by &. E. Russell, of 2,836 specimens 
taken from field sweepings show the parasites to have increased during 
August from27.3per cent, as reported inJuly, to55.7 per cent for August. 
As previously reported, Trimeromicrus maculatus Gahan is the main early— 
season parasite, while Tetrastichus bruchophagi Gahan and Liodontomerus 
sp. increase later in the season." L. L. Stitt of this station makes the 
following report on overwintering larvae of Tetrastichus bruchophagi ob-— 
tained from March to August: "501 overwintering larvae (Tetrastichus 
bruchophagi) were under observation, from which 288 adulis emerged, 176 
being females and 112 males. Two hundred and thirteen, or 42.51 per cent, 
died without transformation to adults. The average length of the pupa 
stage for the females was 11.75 days and for the males, 12.31 days." 
E. G. Davis, reporting on control activities against the south-—- 
western corn borer (Diatraea grandiosella Dyar) in the Tucson, Ariz., dis— 
trict, says, "it was found that 33 per cent barium fluosilicate dust was 
just as effective as stronger dusts up to and including 100 per cent bari- 
um fluosilicate. Infestation of cornstalks in the checks was about 70 
per cent, which was reduced 50 per cent by the application of the dust. 
The egg parasites Trichogramma minutum Riley and Prospaltella sp. have 
very effectively controlled the corn borer this year. * * * The eggs of 
the partial third generation were 99 per cent parasitized and of this 
number 85 per cent was by Trichogramma minutum and 14 per cent by Pros- 
paltella sp. Trichogramma minutum adults were very numerous on green 
corn during August. The larval parasite Apanteles diatraeae Mues. in- 
creased its percentage of parasitism from 4 per cent on the first genera— 
tion to 19 per cent on the second generation. During the last half of 
August adult Apanteles diatraeae were numerous in green corn in search of 
young corn borer larvae. Due to the high percentage of parasitism of 
eggs by the egg parasites and the resulting scarcity of corn borer larvae, 
the effectiveness of this parasite was greatly curtailed," 
R. A. Blanchard, Sacramento, Calif., states that of 643 larvae 
of the southwestern armyworm (Prodenia praefica Grote) "collected in the 
field between July 15 and August 4, 65.3 per cent * * * died from a 
polyhedral disease, 12.9 per cent from unknown or other causes, 12.3 per 
cent were parasitized by Hymenoptera, 4.6 per cent by Diptera, and 4.6 
per cent produced adults. The hymenopteron Chelonus texanus Cress. and 
the dipteron Archytas californiae (analis Fab.) were the two mest preva-— 
lent parasites in this lot of material." 
"Reporting results obtained from a corn—variety test conducted 
at Devers, Tex.," says A. I. Balzer, Beaumont, Tex.," it seems that some 
varieties are better able to withstand borer damage than others. In 
the item of broken-over stalks resulting from borer damage, the varie-— 
ties of Tuxpan and Sacaton June were the least damaged. Sacaton June was 
also the highest yielding variety, outyielding the lowest variety by 12.5 
bushels per acre. 
