nO ae 
parasite, Coeloides brunneri Vier., and the most important predator, 
Lonchaea corticis Taylor, would be spared, as at that time they would 
not have emerged from the trees in which the beetles overwintered. In 
many areas it would still be possible to use fire in the control OfD@thwes 
insect in June; in others it would be prohibitive because of the 
danger involved. * * * Fall control, as practiced at present, is* nor 
only effective in destroying the injurious insects but also destroys 
important parasites and predators." 
CEREAL AND FORAGE INSECTS 
Cold snap at San Antonio fails to kill sorghum midge and prin- 
Seaton, San Antonio, Tex., "on the effect of a minimum air temperature 
of 14° F. on the sorghum midge (Contarinia sorghicola Coq.). Heads were 
selected in the field immediately after this cold snap and 100 infested 
spikelets picked at random from several heads were dissected. These 
showed: Cocooned larvae apparently alive, 82; cocooned larvae dead, 14; 
Eupelmus popa Gir. larvae alive, 11; Eupelmus popa larvae dead, 0. Later 
dissections gave results as follows: Cocooned larvae apparently alive, 
87; cocooned larvae dead, 15; Eupelmus popa larvae alive, 4; Eupelmus 
popa larvae dead, 1. From this it is seen that the cold weather has 
apparently had little effect on the midge or its parasite.” 
Sugarcane borer killed by cold at Beaumont, Tex.--A. I. Bal- 
zer reports that "Two successive days in February with 15° F. increased 
the mortality of Diatraea saccharalis Fab. to 88.2 percent in late— 
planted corn. A year ago with no frost recorded to the same date the 
mortality was less than 10 percent in late corn. However, it is in— 
teresting to note that in January 1930, when the temperature was at 
10° F., a mortality of 99 percent was found soon after the ireezeum 
Hay damaged heavily by leafhoppers.—-"Since 1929 an effort has 
been made at Arlington Experiment Farm to determine losses caused by 
Empoasca fabae (Harris) to alfalfa in field cages each one square 
rod in area and covered with tobacco cloth," reports F. W. Poo: 
Rosslyn, Va. "An attempt was made to maintain a heavy infestation 
(as frequently occurs under natural conditions) in one cage, while a 
cage nearby was kept practically free from these leafhoppers. During 
1€30 the extreme heat and drought made it impossible for the leafhoppers to 
live long enough in the cages for any significant data to be obtained. 
The results of these studies, based upon four cages, except during 1929 
when only two cages were in operation, are as follows": In 1929 the hay 
in the infested cages showed a loss of 26 percent, based on air-dried 
weights (spring seeding, only two cuttings); in 1931 the loss was 27 
percent, based on second and third cuttings only; in 1932 the loss was 
«5.5 percent, based on three cuttings, green weights only. "In 1929 the 
hay from the cages was referred to the Bureau of Agricultural Economics 
for grading and the infested cages yielded U. S. Grade 2 leafy, and the 
