BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 
]:; 
sections were scouted for unlisted palms and 307 properties checked for 
volunteers. This concludes the eradication work in the Phoenix district, 
except for the final inspection of a few plantings of offshoots from previously 
infested properties in the Coachella Valley and the Imperial Valley. 
YUMA DISTRICT 
In the Yuma district 530 palms were inspected from ground and ladders and 
16,173 from the ground only, and 139 offshoots were certified for movement. 
Leaf bases were removed from 97 previously infested palms, 643 palms in th< 
infested area were dug out and destroyed, 239 palms were pruned and offshoots 
destroyed, and 14 were pruned. No scale was found. This concludes the eradi- 
cation work in the Yuma district, except for ladder inspection on 3 properties. 
A summary of date scale activities is given in table 8. 
Table 8. — Summary of date-scale actiritics, fiscal 
yt <ir 19S5 
Item 
Palms inspected from ground and ladders. 
Palms inspected from ground only 
Offshoots inspected for movement 
Palms pruned to facilitate inspection 
Palms pruned and offshoots destroyed 
Palms leaf-base inspected _ 
Palms dug out and destroyed _. 
Sections scouted for unlisted palms 
Properties checked for volunteers 
Palms checked to determine elean-up necessary, 
Arizona 
California 
Yuma 
district 
Phoenix 
district 
Coachella 
Valley 
district 
Imperial 
Valley 
district 
530 
12 
6,167 
4,478 
16, 173 
2,617 
25, 750 
14, 545 
139 

6,967 
356 
14 

2,343 
77 
239 



97 

29 
24 
643 

10 
2 

4 



3C7 


4,934 



Total 
11, 187 
59,085 
7,462 
2,434 
239 
150 
655 
4 
307 
4,934 
JAPANESE AND ASIATIC BEETLE INVESTIGATIONS 
JAPANESE BEETLE 
The area continuously infested by the Japanese beetle in 1934 was estimate) 
at 9,700 square miles, in the States of New Jersey. New York, Pennsylvania. 
Delaware, and Maryland. This is an increase of 900 square miles over 1933. 
No appreciable increase in the beetle population was found in the older 
infested area of New Jersey. The infestation has definitely increased in the 
more recently infested counties in southern New Jersey and in nearly all of 
the infested sections of Pennsylvania, Delaware, and Maryland. A source of 
public complaint has been the number of beetles, dead and alive, washed up 
on the shores of bathing beaches. A combination of favorable winds and high 
temperatures at the time of maximum beetle flights resulted in enormous 
swarms of beetles being carried over the Delaware River and the Atlantic- 
Ocean. This situation has been particularly annoying along the New Jersey 
and Long Island coast beaches. 
It has been found that larval populations develop faster in sod fields than 
in cultivated fields. The average density of the larval population in the 
heavily infested districts ranged from 13.7 in pastures to 2.3 per square fool 
in pumpkin fields. It is evident that the population is higher in fields planted 
to crops, such as corn and asparagus, on which beetles feed readily, than in 
fields of tomatoes, potatoes, and pumpkins, which are only occasionally 
attacked. 
During the past two winters unusually low temperatures and heavy snows 
occurred in the area of general infestation. Owing to the presence of a hea\.\ 
covering of snow, the soil temperature was only slightly Influenced by the cold. 
and there is no evidence that there was any marked general reduction of the 
larval population. 
Bacterial diseases, particularly the " milky " disease which appears to develop 
at a temperature above 60° F., caused a noticeable reduction in the Larval 
population during the spring of 1935; in limited ureas in some localities about 
one-fifth of the larvae were affected. The occurrence of disease is. however, 
localized and subject to considerable fluctuation due to variable soil conditions. 
