10 BULLETIN 1206, r. S. DEPARTMENT OF AGRICULTURE. 
The percentage mortality to September 24 of all beetles confined 
from plat 1 was 98.89 per cent, from plat 2, 65.56 per cent, and 
from plat 3, 5.56 per rent . 
OTHER FIELD AND INSECTARY OBSERVATIONS IN 1921. 
Frequently trees other than those selected for records were jarred 
in the several plats to obtain additional information on the effective- 
ness of post-harvest dusting. On August 23 , 46 curculios were 
collected from one large tree in the untreated plat. Only about 5 or 
6 beetles per tree were taken from the dusted plats at that time. 
Many fresh-looking beetles were caught daily, some of them soft 
and reddish in color, indicating new second-generation adults. 
Very often more than 10 per cent of the beetles collected showed 
indications of having recently emerged. An emergence as heavy as 
this would tend to keep a continued supply of curculios on even the 
dusted trees, as the poison usually does not kill the beetles in less 
time than from four to six days. 
Many attempts were made throughout the season to observe the 
beetles feeding in the orchard, but only the results of their work on 
the foliage could be found. Frequently the beetles confined in battery 
jars in the insectary were observed feeding on foliage, especially 
on that not dusted. This feeding took place mostly at night. Their 
feeding is very characteristic, producing irregular holes, which might 
be started above or below on any portion of the leaf. (PL II, fig. 2.) 
These holes vary in size from that of a pinhead to a quarter of an inch 
in diameter. The tender foliage of the new growth is preferred to the 
fully matured foliage, but often they feed on the older leaves. A 
considerable amount of feeding is done on the glands at the base of 
the leaves. Dusted foliage does not appear to be palatable to the 
beetles, and very little feeding is done on it, even though it be the 
only food available. The dust apparently has some repellent action. 
When poisoned foliage is taken as food, the type of feeding is similar 
to that on untreated foliage. 
RESULTS OF EXPERIMENTS AT FORT VALLEY, GA., IN 1922. 
The 1922 post-harvest experiments were conducted in a 6-year-old 
Uneeda orchard. This work was begun, as in former years, about 
four weeks after the last varieties had been harvested in the vicinity. 
In the work in 1922 both dust and liquid spray were used, to deter- 
mine their killing effects on the beetles when they were forced to 
feed on the foliage after the fruit had been harvested. The orchard 
contained 1,600 trees, which were divided into four blocks of approxi- 
mately 400 trees each. Plat 1 was used as a check, receiving no 
treatment during the experiment; plat 2 was sprayed once; plat 3 
was sprayed twice; and plat 4 was dusted twice. This orchard was 
near the one used for the post-harvest work in 1921, and the curculio 
hibernating quarters and the conditions for breeding were similar. 
A ditch ran along one side of all plats and there was a wooded area 
about 300 yards away. The trees were in good foliage at the begin- 
ning of the experiment. However, the beetles were not as numerous 
as they were in the orchard used for the work the previous year. 
