7 
from the date of application no effect was to be observed and no 
dead insects were found. 
Kerosene emulsion was applied at 8 and 10 per cent strengths. 
There was practically no difference in the effect of these two strengths, 
and at the end of nine days no “ green bugs” were to be found on the 
areas so treated. Also there was no perceivable injury to the grass. 
Whale-oil soap solutions, varying in strength from one-fourth of a 
pound to 2 pounds of soap to each 5 gallons of water, were applied to 
similar areas. In this case the stronger solution injured the grass 
shehtly, but not permanently; in the case of the lesser strengths there 
was no injury whatever. The effect on the “ green bug” was the 
same in every case. They were not only literally exterminated over 
the areas treated, but the applications seemed to protect from a rein- 
festation. In case of even the weakest solution an examination, five 
days after the application was made, revealed the “ green bugs” in 
myriads and breeding freely on the untreated space, while but 8 
inches away and on the treated area living bugs were scarcely to be 
found, though the dead were to be observed almost as abundantly as 
were the living on the space untreated. It must be remembered, 
however, that these experiments were carried out in grass kept closely 
cropped by frequent use of the lawn mower, and the results obtained 
in no way reflect upon similar experiments carried out by Messrs. 
Ainslie and Phillips in the grain fields of Oklahoma. 
INVASION OF 1907. 
A better appreciation of the interrelation of the “ green bug” and 
its principal parasitic enemy can be conveyed by giving a chrono- 
Jogical statement of our investigations of the very disastrous inva- 
sion of the “ green bug” during the winter and spring of 1907. 
The first rumors of injuries by this pest came to us early in Janu- 
ary from east-central Texas, where the “ green bugs” were reported 
to Mr. W. D. Hunter, in charge of cotton boll weevil investigations 
of this Bureau, as attacking fall oats. During this month in Texas, 
east of a line drawn from near Gainesville through Abilene and 
San Antonio to Galveston, the temperature was 9° above the normal. 
Within this area was a smaller one, the boundaries of which may be 
indicated by a line drawn from Texarkana to Fort Worth, Waco, 
and Joaquin. Over this latter area the temperature for the same 
month was 12° above the normal, and within this area the pest began 
its work of destruction. 
Also, judging from data received later, the pest began to breed 
rapidly in fall-sown oats in southern South Carolina, where the tem- 
perature was from 6° to 9° above the normal. 
[Cir. 93] 
