THE .CALIFORNIA PEACH BORER. 85 
The trees were examined from time to time, and injury from the 
_ oils was soon apparent. Early in October most of the leaves on the 
trees in plats Nos. 2 and 3 had fallen, and the remainder of the leaves 
were curled and nearly ready to drop. There was a marked contrast 
between the oil-treated trees and those which were treated with the 
lime-oil wash or which were not treated at all. Trees treated with 
the lime-oil wash were apparently in normal condition. The oil- 
treated trees again in the spring of the following year were in a 
weakened condition, and by June 1 trees No. 13 in Plat IT and 23 
and 25 in Plat III were dead. All trees in Plat I and the adjoining 
check trees were in normal condition and possessed a bright, healthy, 
green foliage. It is very evident that peach trees can not be safely 
treated with crude oil alone, although the lime-oil combination 
appears altogether safe. The trees in this experiment were exam- 
ined from time to time to notice any new infestation of the insects, and 
no worms or pup or pupal cases were ever found on any of the 
treated trees, although numerous worms infested the surrounding 
check trees. 
Tn addition to the attack which would normally be made by moths 
living in the open field, several trees were subjected to attack by 
placing fertile eggs on them as in experiment No. 1. Table IX 
shows the number of the eggs, where they were placed, and the 
results of examination of trees June 10, 1909. 
TaBLE IX.—Details of experiment No. 2 with protective washes against the California 
peach borer. 
: = Num- 
Plat Tree | Number | Number | Date of has 
No. No. | ofeggs. | hatched. | hatching. per a Remarks. 
ured 
| | 
al pm 1908 
Topstegsey i eee ne ue None. |) No larve, pup, or pupal cases taken from 
at eceredies BI 144 | 136 |...do....! None. |f 2@Y of the treated trees, although infestation 
Ne oo a 29 295 216 | Aug. 13 | None, was common in adjoining check trees. 
ne Ce 573 Dabseeecee esse None 
‘‘WORMING”’ AND APPLYING WASHES IN THE SANTA CLARA VALLEY. 
The method of controlling the borer as practiced by orehardists 
in the Santa Clara Valley is to ‘‘worm” the trees by hand during 
the winter or spring months and later apply a protective wash before 
the dirt is thrown back. Some orchardists, however, dig the borers 
out without giving any subsequent treatment. The digging out 
process is the most important and most effective. The earth is 
shoveled away from the crown of the tree, the dirt and old bark 
scalings are scraped off, and the worms are cut out by hand. An 
ordinary three-fourths-inch wood chisel and a horseshoe knife are 
71419°—Bull. 97—12 7 
