=Lo— 
Condition of hessian fly in hibernation : in Tennessee and Indiana.-- 
ractically all the hessian fly were in puperia ia and dormant at Lafay- 
e, Ind., in January. At Fayetteville, Tenn., hovever, the mild 
ther and ample rainfall during January actually caused a little 
Sane pag Curtis Benton found 2 live pupae in 100 puparia dissected 
on January 26. His dissections of puparia late in January also showed 
about 4 percent mortality. 
No significant difference between 100-unit samples and 36-unit 
samples for hessian fly.--J. R. Norton also reports on experiments 
to determine if samples as small as 36-units , either plants or culimigy 
are reliable when fly population is at a minimum. Method: 16 samples 
of 100 units each were taken from an irrigated and from a nonirri- 
gated wheat plot and compared on the basis of infestation and fly 
population with 15 sarmles of 36 units each from the same plots. The 
standard errors X 4 (40M) were used asa basis of comparison for plant 
and culm infestations and for number of puparia per 100 plants and 
per 100 culms. Results: The true means would fall within the follow 
ing range with only one chance in about 135, in each case, of being 
wrong.. The actual means and the range were as follows: 
(1) Plant infestation Population on plants 
100-plant units 


Plot Range Mean Range Mean 
Percent Fercent Pencent Percems™ 
Irrigated Sie La0 69% ee 9.8 
Nonirrig rated 1.9 - 5:7 i hs Dr Oe aad ae Lg 

Irrigated MO ees 7.6 Lhe ee lu 
Noninrizated Osos 5x5 bye! ts ie Ug 
(2) Culm infestation Population on culms 
LO0O-culm units 
Irrigated bez ege 79 a. Le Det thas co 
Nonirrigated 0.7 - 1.9 rie, bis Gace aa 1.4 
36-culm units 
Irrigated Or 2e 24h 26 2.6 O38 nn Bad 4.2 
Nonirrigated 0.0 - 2.0 0.8 OrOpeaes 0.9 
