48 BULLETIN 1429, U. S. DEPARTMENT OF AGRICULTURE 
Table 5. — Food plants of Popillia japonica in Japan 
For the Region of Tokto, Yokohama, and Southward 
Botanical name 
Common name 
Parts of plants eaten 
Trees: 
Castanea pubinervis ! 
Quercus variabilis 
Oak 
Quercus serrata 
do 
Do. 
Populus maximowiczii 
Do. 
Do. 
Ulmus parvifolia.. 
Elm 
Do. 
Zelkova serrata .. .. 
Kiaki 
Do. 
Do. 
do 
Do. 
Alnus japonica .. . - 
Alder 
Do. 
Primus serrulata 
Cherry 
Do. 
Melia japonica ! 
Flowers. 
Shrubs: 
Hedge plant, nonindigenous— 
Do. 
Vines: 
Cultivated grape 
Blind grape 
Do. 
Do. 
Leaf. 
Do. 
Herbaceous plants: 
Leaf and flowers. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Dock 
Leaf. 
For FvEGic 
n North of Toksto to Sappo 
RO 
Trees: 
Chestnut 
Leaf and flowers. 
Leaf. 
Kiaki 
Do. 
Do. 
Do. 
Do. 
Do. 
Willow 
Do. 
Shrubs and vines: 
Wild roses 
Leaf and flowers. 
Cultivated and wild grapes... 
Do. 
Leaf. 
Herbaceous plants: 
Leaf and flowers. 
Do. 
Do. 
Asparagus officinalis J 
Do. * 
Fern 
Leaf. 
Hypericum sp 
Flowers. 
Do. 
Rumex sp 
Dock 
Leaf. 
i Favorite food plant. 
CLIMATIC CONDITIONS IN THE MAIN FIELDS OF INVESTIGATION 
A comparison of the climatic conditions in the various regions 
in which work was conducted with those in the infested area in 
America is of value from two points of view: (1) In relation to the 
reactions of PopiUia japonica itself under varying conditions, and (2) 
asjbearing upon the question of establishment of the oriental parasites 
in this country. 
Figure 32 gives a graphic representation of the mean monthly 
temperatures throughout the year for Yokohama, Koiwai, and 
