Report of State Bjard of Horticulture. 83 



may at any time appear upon the ornamentals of the city lot 

 as well as the trees of the old home orchard. Dr. L. 0. 

 Howard records it upon the following plants: 



List of food plants. — Orchard fruits — Pear, peach, apple, 

 plum, cherry, Rocky Mountain Dwarf cherry, persimmon, 

 quince. Flowering quince. Small fruits — Strawberry. Bush 

 fruits — Raspberry, gooseberry, grape, currant, Flowering 

 currant. Black currant. Nut plants — Almond, chestnut, 

 pecan, Black walnut, English walnut, Japan walnut. Miscel- 

 laneous ornamental plants — Forest and shade trees, rose, 

 hawthorn, spirea, cotoneaster, euonymus, English huckle- 

 berry. Linden, acacia, elm, Osage orange, alder, sum.ac, Weep- 

 ing willow, Red dogwood, juneberry, laurel, English willow. 

 Golden willow. Laurel-leaved willow, milkweed, catalpa speci- 

 osa, Lombardy poplar. Silver maple, Carolina poplar. Golden- 

 leaved poplar. Cut-leaved birch, mountain ash, Japanese 

 quince, actinidia, Citrus trifoliata, snowball, loquat, akebia. 



HOW TO KNOW THE SAN JOSE SCALE. 



Perhaps the worst feature of an attack by San Jose scale 

 is that owing to its small size and inconspicuous color, it 

 often remains unnoticed until the tree has been seriously 

 injured or even killed. That the tree lacks vigor may be 

 recognized, but the cause of its unthriftiness is overlooked. 

 Yet it is not difficult to detect when one really looks for it. 

 In the early stages of infestation a few scales may be found, 

 usually clustered about the buds of the preceding season's 

 growth, or even on two year old wood. The mature scales 

 are grayish in color, being usually but not always somewhat 

 lighter than the bark to which they are so closely attached. 

 The immature, half-grown scales which may be found with 

 the mature ones, are at the present time somewhat darker 

 in color. 



The mature females are nearly circular in shape, are ap- 

 proximately one-sixteenth inch in diameter and each is some- 

 what raised in the center to form a slight protuberance or 

 nipple which is lighter in color than the rest of the scale. 

 (See Fig. 1.) H this scale is carefully examined by means 

 of a small magnifier several concentric circles may be ob- 



