INSECTPEST SURV E.Y BULLET IN 
Vol. i November 1, 1021 Ho. 7 
CEREAL ;: T L ? 3 U E - C 3 P INSECTS 
""": ' ' I 
HESS LAN FLY (Phytop ha^a destructor Say) 
Ohio H. P. Gossard (October 21). ''Hessian fly apparently issued at about 
the normal date this season and most of the "brood came forth as 
adults before the 1st of October. The highest rate of emergence 
at the breeding stations at Sandusky and Bryan v/as about the 22nd 
of September; but steady and heavy emergence continued until : 
second peak nearly equal to the first v/as reached on the 28th of 
September at Bryan and on the 29th of September at Sandusky. Con- 
siderable emergence v/as reporded on the 1st and 2nd of October, 
after which there /as s rapid falling off of Hessian fly activity. 
The peak of emergence of psrasites in the cages ;vas on the 20th 
and 21st of September, just one cr two days earlier than the 
peak of fly emergence. It is tho ught that practically all 
counties observed the seeding dates sufficiently "/ell to escape 
any heavy infestation. The cooperation of the farmers and 
heavy parasitism of the fly v/ill doubtless prevent much of s 
brood next year. '"'a expect the entire State to nsve but little 
more than a normal infestation next year, even in the districts 
that were most heavily infested this season." 
Indiana «T. J. Davis (October !<-)• "The Hessian fly seems to have 
issued normally and we dc not anticipate any trouble from this 
source since sowing wheat after the fly-free date v;as universal." 
Illinois 7. ?. Elint (October 15). "Probably over 35 per cent of the 
wheat in the State was sown after the fly- free date, this in 
spite of the fact that in most counties o larger acreage than 
usual has been seeded. Prom present indications the fly had 
all emerged before wheat sown on the fly- free dstes had come up. 
Volunteer wheat snd a few early sown fields show moderate in- 
festation." 
Missouri ■• L. Haseman (October 18). "During the month field observations. 
and experimental seedings of wheat in the various Hessian fly 
experimental fields throughout the State have been made. Ex- 
tension Entomologist Burrill has also done considerable field 
work with county agents and farm organisations and has kept as 
closely in touch with the development of the fly situation is 
possible. North of the Missouri °.iver much of the wheat seeding 
necessarily was delayed until the determined fly free date for 
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