~ 4 = 
v 






























dence, Rhode Island showed distinct evidence of having been brags 
yood was alive but the insects (all females) were dead; a limited ax 
characteristic eeu 33 fluid in their bodies and the tow eges under an 
hat the insects were overtaken by an early trost aie 
scale seem +o indicate * 
killed them before the ents of oviposition was completed. 
OPENING OF THE SPRING CAMPAIGN AGAINST INSECTS IN ine 
- bY OR 
The spring campaign in the territory covered by the Lafayette laborat 
been inaugurated by the temporary establishment of two substations for the s : 
work, (. F. Turner is now stationsd at Nashville, Ill., where he will contin 
Hessian-fly investigations following the work of W. H. Larrimer, who on Janus 
was granted a furlough to enter the Officers’ Training Camp. D. A, Ricker wi 
stationed at Janesville, Wis., to conduct experiments in the field, chiefly or 
corn root-aphis and white grub, In connection with the work of these stations 
well as the work at the Lafayette laboratory, it is planned to obtain complete 1 
cords of the meteorological conditions with a view to correlating these with - 
activities and cae ier 
permit us to a oe ANY hat Hocetene Ply ep aeeceen will be light this span 
probably this fall as well. Cutworms and grasshoppers were common in many Local 
ties last year and the winter has been favorable for their successfull hiberne t: 
so that an especial lookout should be made for these pests. Indications point 
an abundance of chinch bugs in certain more or less restricted areas in southern | 
Illinois. ‘ 
Contererces have been held with the entomologists of Illinois and Wisco: 
and it is planned to hold similar meetings with the entomological authorities a 
indiana and Michigan in the near future. The purpose of these conferences is 
more closely coordinate the work of the States and Federal government to secure 
maximum of results. We are receiving the most cordial cooperation irom all 3s 
authorities. 
Our station staff has bee depleted by the loss of Larrimer and Mason who 
entered the army service. W. O. Hollister, formerly with the Davey Tree Company 
Kent, Ohio, has recently reported for duty at this station. HA 
We have recently received visits from D. B. Whelan, extension entomologis 
Michigan and D, K. McMillen formerly connected with this Bureau and at present — 
the Illinois State Council of Defense, 
During the months of January and February, 0. F. Turner and the writer’ 
ducted a series of tests with poison bait agaist armyworms (Cirphis unipun 
to determins the possible values of different mixtures and the relative value 
Sawdust as a substitute for bran and of various arsenicals in comparison with 
green. Briefly, our results showed bran to be superior to sawdust although fa 
good results were obtained with sawdust alone as well as a combination of sawd 
and bran and they warrant further trials in the field under natural conditions 
Considering their effectiveness and rapidity of action the various arsenicals 
to give reliable comparative value in the order here named, -Sodium arsenite, 
green, crude arsenious oxide, calcium arsenate, lead arsenate, and common whi 
senic (arsenious acid). All were tested at a comparative strength of one po 
poison to 40 pounds of filler excepting lead arsenate which was used 1 to 
first three mentioned were Similarly effective with calcium arsenate nee 
in effectiveness. Lead arsenate was effective when used 1 to 20 buts its a 
was slow which makes it less desirable for use against cutworms or crebaeel ar 
Common white arsenic gave us unsatisfactory results. Crude arsenious oxide us 
dedi 
