The Insect pest survey bulletin

    Front Cover
        Page i
        Page ii
    Hessian fly survey at harvest-time, 1938
        Page 515
        Page 516
        Page 517
        Page 518-A
    Back Cover
        Page 519

THE INSECT PEST SURVEY


BULLETIN


Volume 18 Supplement to No. 7 September 20, 1938


BUREAU OF

ENTOMOLOGY AND PLANT QUARANTINE

UNITED STATES

DEPARTMENT OF AGRICULTURE

AND

THE STATE ENTOMOLOGICAL


AGENCIES COOPERATING


. F .PL
















INSECT PEST SURVEY BULLETIN


Vol. 18 Supplement to Number 7 September 20, 1938



Hessian Fly Survey at Harvest-time, 1938


Field surveys made by.the Bureau of Entomoloy and Plant Quarantine
field stations at Manhattan and Wichita, Kans., Lafayette, Ind., and Carlisle,
Pa., and the State agricultural experiment stations of Illinois, Ohio, Oklahoma,
and Nebraska indicate that hessianm fly populations are from low to moderate in
Nebraska, Kansas, Oklahoma, Missouri, and Illinois, the southern half of Indiana,
central Ohio, Kentucky, Tennessee, western and south-central Pen-sylvania, Mary-
land, Delaware, and Virginia. However, there are man'icin- populations of flies
in local fields and arens in most of t',c.-e States or districts.

1-hirkod increase of the hessian fly has occurred throughout the northern
half of Indiana and the nortbh:eostorn counties of Ohio. Adherence to the- safe
seedirn datcs is particularly advisable for these districts.

Sliht-to-moderate increases of fly infestations are recorded for central
Ohio, eastern mand northern Pennsylvania, northwestern and south-central Virginia,
and north-central North Carolina, with moderate-to-.severe infestations likely
to occur in the fall of 1938 in Pennsylvania -nd North Carolina.

The summarized data below and the accompanying map indicate more fully
the regions covered by the survey and the general trend of fly infestations. A
field sample in the survey usually consisted of 50 wheat stems.











515


^T] BARY









S516 -


Area : Fi


Neb r as : a
Southwestern -------------:
South-central ---- ------
Southeastern -----------..---

Kans as:
ITorthwestern -.-...---------
North-central -.---------
Northeastern ---------.. :
South-central -.----------------.
Southeastern --------------

Oklahoma:
Northwestern -----------------
North.central _---------
Northeastern -.-----------..

Missouri:
Northwestern -.--------------- :
North-central .-..-------------- :
Northeastern --------.---------:

Illinois:-l/
Western, central,and eastern -
Southern---------------------

Michigan:
Southwestern -----------------:
South-central .--.----------------
Central (south) and. southeast-:
ern ----------------------

Indiana:
Northern and. central (north) -
Eastern, central (south),
southern, and western ----
Southwestern .------.. .....


Lelds
impled
imber

3
27
g4


185
4o
145
4o
37

19
28
37

19
28
37







16
15
a







17


162
189
42
37


Ave
Per


t q


l/Mostly frcm survey by State entomologists.


rage e
cent
0
0
0


0
0

3

5


1
o :
S

9







0
1 9



7
2


3
35
1 99
l













-2

5
a
*


Stems infested
JMaximum Minimum
Percent : Percent

0 : 0
2 : 0
6 0


0 0
4 0
56 0
26 0
28 0


2 0
2 : 0
10 0


2 0
2 0
10 0
14 0

52 : 0
2 : 0








g6 0
30 : 0
2 : 0
2 0










16 : 0
9
2o : 0
26 : o








- 517 -


Area : Fiel
SsaMT
: Numb


Ohioo/
Northwestern, north-central and:
central (north) -----------
Western and central (south) --:
East-central ------------------

Kentucky7
W:.stern --------.----------:
Ear t-central ---------------

Tennessee:
Wast central ----------:
Eastern ---------------------

Pennsvlwvania:
Western ----- ------------------
North-central ...---------------- :
South-central .----.---
Eastern ----------------------

Delaware ...----------..----.---------

Maryl ind:
Wer tern ----------------:
Eastern ..----------------------

Virginia:
Northwestern ------------------
Northeastern -----------
South-central -----------------

North Carnlina:
North-central ------------


.Vi

2/


Av
Po


ds
led
er


L45
141
50
9

25
34


54
67
9


15
20
35
25
9
10


25
15

25
30
15


4o
*


Mostlvl, from survey by State entomoloJists.

SApproxiaate.


'*erage _
recentt


16
8
1

5
2


1
1


1
11
6
16

0


4
4




7


10
*
11


Stemr inf estoed
IMax mun : Minimum
Percent : Percent







26 : 0
18 : 0


8 : 0
16 : 0


6 0o
40 0
58 0
90 : o

30 : 0


4 : 0
10 : 0


42 0
12 : 0
4o 0


54 0o




















o rl
n 0
E-4)











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te




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