iy pi 
CEREAL AND FORAGE INSECTS 
Biology of a Hessian fly parasite.--C. C. Hill, Carlisle, Pa., — 
states that he has taken advantage of a recent heavy emergence of the ~ 
Hessian fly parasite Tetrastichus carinatus Forbes to work out its 
life history and morphology, as nothing has been published on this 
subject. He finds: "The parasite oviposits in the host both when it 
is in the larval stage and after the puparium has been formed. The 
entire larval period is passed within the host. . The egg has been re— 
covered and drawn, as well as the first, second, and last larval in— 
stars. The primary larva is unlike any chalcidoid first-instar larva 
known to the writer because of peculiarly located palpi on the head 
and peculiar spiny plates which cover the entire body except the head ~ 
and part of the ventrum. There is every indication that this para— 
Site passes through only three instars, * * * a departure from the usual 
five instars which most chalcidoids have. The oOvipositing adult is 
short lived, since most of them last only from 8 to 11 days." 
southwestern corn borer extends its range.—-In October J. R. Horton 

and E. T, Jones, of Wichita, Kans., made a survey of the new terrixors 
the past year. They report: "In the north Texas panhandle, the borer 
was found to have established itself, 4 per cent infestation, at 2 miles 
west and 2 north of Perryton, no extension of line eastward between Per-— 
ryton and Canadian. * * * In Oklahoma proper east of Wellington, Tex., 
was found the greatest extension into new territory encountered. The 
borer was found near Madge, Okla., again at 6 miles north of Hollis, and 
again at 7 miles north of Gould, the infestation apparently confined to 
corn along the Salt Fork of the Red River and its tributaries. * * * 
Another notable extension was found along the Red River in Texas, where 
a 56 per cent infestation was found 8 miles north of Childress in corn 
not infested last year. Away from the river also infestations were found. 
7 miles east and south of Childress, to a point 3 miles west of Kirk— 
TaN ake oul 
Barium silicofluoride spray protects dahlias from corn borer.— 
C. H. Batchelder and assistants, who have been experimenting at Berkley, 
Mass., with insecticides for dahlia plants infested with Pyrausta nub— 
ilalis Hbn., have found barium silicofluoride to be satisfactory in re— 
ducing infestation without injury to the plants. "Barium silicofluoride 
(2.25 pounds per 100 gallons) and nicotine tannate (0.75 pint aes 
pounds per 100 gallons) were compared as suspensions in a 0.5 per cent 
oil emulsion. * * * Both insecticides were effective in materially re— 
ducing both stalk injury and the larval population * * * in infestations 
originating from migration as well as from egg deposition. * * * no foliage 
or blossom injury was found. On the contrary, blooms were larger in 
treated plants, and in most varieties more blooms were produced than on 
the untreated plants. It was also noted that marked reduction of ‘plight! 
(a fungous disease) occurred when the plants were treated with barium © 
Silicofluoride. The data indicate that, when. employed against an infesta— 
tion originating from natural oviposition, barium silicofluoride is more. 
effective than nicotine tannate." 

