Tn Be 
CEREAL AND FORAGE INSECTS 
A. I. Balzer, Beaumont, Tex., states that the larvae of the sugar- 
cane borer (Diatraea saccharalis Fab.) "were found actively feeding 
during January in late sorghums, which are still green, and in sugar— 
cane shoots which have come up since the cane was harvested. In dry 
cornstalks examined, larvae were all in the overwintering stage." 
A statistical compilation by R. L. Shotwell, Bozeman, Mont., of 
data on the life history and habits of the two-striped grasshopper 
(Melanoplus bivittatus Say), according to J. L. Parker, "has graphic- 
ally shown some interesting things pertaining to the r6le temperature 
olays. The unusual hot temperatures experienced in South Dakota dur- 
ing July, last summer, forced the maximum feeding period up 1 1/2 hours 
earlier in the morning and shortened it by about 2 hours, as compared 
with the data obtained in Montana during previous years. A significant 
correlation was found between the time of feeding and air temperature 
but none between feeding period and relative humidity." 
Reporting»on his studies of parasites of the wheat joint worm 
(Harmolita tritici Fitch), F. F. Dicke, Charlottesville, Va., Says: 
"A summary of the data on the abundance of joint worm parasites reveals 
that there has been a substantial increase in parasitism at all obser— 
vation points with the exception of one point in eastern Virginia, * * * 
which showed a decrease in percentage of parasitism, the only point 
under observation which had an increase in joint worm abundance. The 
maximum percentage of parasitism (65 per cent) was found in Ohio. This 
ooint had a decrease of approximately 70 per cent in jointworm infesta— 
tion, with an increase in percentage of parasitism of over 400 per cent. 
The rapid increase in parasitism at this point was largely due to Ditro— 
pinotus aureoviridis Crawf., a species which normally has three genera— 
tions annually. It is apparent that the decrease in joint worm abund— 
ance greatly influenced the increase in percentage of parasitism. Two 
species, Eurytoma parva (Gir.) Phillips and Ditropinotus aureoviridis 
Crawf., predominated at all observation points in approximately equal 
numbers." 
On the same subject T. R. Chamberlin, Forest Grove, Oreg., states: 
"A study of parasitism in 1931 stubble from near Tangent, Oreg., which 
lies in the 'Lebanon colony' of the joint worm, showed at the time of 
dissection the following condition: 
Parasitism by D. aureoviridis (parasites present ) 19.5 per cent 
i ‘pe; a! (including issuance) 29.5 " us 

"  Eurytoma parva ny psy) 7 
ns " eupelmids (E. saltator Lind., etc.) On Caan ut 
Undetermined parasites less than 1.0 " a 
Total parasitism ey ye os 
"In these dissections, as on some previous occasions, a record 
was kept of those Harmolita which were destroyed by Eurytoma which had 
entered more than one cell, and also of those Eurytoma which had been 
destroyed by other parasites. With these records included the actual 
destruction of Harmolita was shown to be 54.2 per cent and the original 
parasitism by Eurytoma 20.7 per cent." 
