310 NEW YORK STATE MUSEUM 



The State of New York has for the last three years maintained a corps 

 of inspectors for the purpose of examining all nursery stock for the pres- 

 ence of this and other injurious pests. Many exceedingly valuable facts 

 have been gained in this manner, and the following comments on the 

 food plants of the San Jose scale in New York state by G. G. Atwood, 

 now in immediate charge of this work, are based on,c()nsiderabIe experi- 

 ence. The plants are grouped in three sections. 



1 This list of plants on which this scale is not found, although in 

 proximity to infested plants, includes all evergreens and as follows, viz : 

 ailanthus, althea, amaryllis, American ivy, anemone, aspen, azalea, bar- 

 berry, Boston ivy, buckthorn, beech, butternut, buttonwood, catalpa, 

 chestnut, cherry (black tartarian), chionanthus, clethra, corylus, currant 

 (black), cranberry, deutzia, elder, elm (American), euonymus, exochorda, 

 forsythia, ginkgo, hydrangea, Judas tree, halesia, hickory, Kentucky 

 coffee tree, laburnum, larch, liquidambar, locust, magnolia, maples 

 (sugar, Norway, ash leaf and Japan), matrimony vine, mulberry, oak, 

 paeonia tree, philadelphus (mock orange), plum (wild goose), privet, 

 rhododendron, silver thorn, snowball, spiraeas (some species), sycamore 

 (plane tree), tamarix, tulip tree, viburnum, weigela, wistaria, xanthoceras 

 and yellow wood. 



2 The following is a list of plants on which the San Jose* scale has 

 been found, though in very small quantity, and no injury has resulted 

 from its presence, and it is probable that it will not live over winter on 

 them in this state, and it is not likely to breed freely on them: alder, 

 amalanchier, ash, birch, blackberry, chestnut, dewberry, dogwood (flow- 

 ering), elaeagnus, eucalyptus, fig, grape, honeysuckle, horse-chestnut, 

 kerria, maples (silver and wiers), milkweed, mountain laurel, pepper- 

 grass, poplars (except aspen), quack grass, quince (edible), raspberry, 

 rhus, spiraeas (some species), strawberries, walnut (English), and to this 

 list I would add cherry commonly called '' sour," including such varieties 

 as Richmond, Morello, etc. 



3 The following is a list of plants on which the San Jose scale finds 

 suitable food, and therefore spreads rapidly, causing serious injury: 

 acacia, akebia, apple, peach, pear, plum, cherry (sweet), apricot, necta- 

 rine, almond (flowering), cherry (flowering. Rocky mountain dwarf and 

 Japan), cotoneaster, Crataegus, currants (red, white and flowering), elm 

 (Enghsh), gooseberry, Japan quince, mountain ash, peach (flowering), 

 prunes (flowering and pissardi), Osage orange, snowberry and willow 

 (many species). 



It is noticed that this latter list is not very long, but unfortunately it in- 

 cludes the principal orchard trees and currants. In some sections it 

 looks as if the San Jose would not thrive on Kiefler pears, while else- 

 where it proves very destructive to this variety. 



Distribution. This pest is widely distributed in the United States, 

 having been recorded from 36 states and territories, besides the District 

 of Columbia. It has also been found in a number of localities in 

 Ontario (Can.) 



