FIELD ENTOMOLOGIST. „ 
. A striking difference was apparent when the number of injured 
twigs per tiee weie bi ought into comparison by observations made 
in May and shown in the following table: 
A COMPARISON BETWEEN LIME AND SULFUR WASH AND ARSENATE OF 
LEAD AGAINST PEACH TWIG-BORER. 
Spray. 
Date 
Spray¬ 
ed. 
No. 
trees 
spray¬ 
ed. 
No. 
trees 
exam¬ 
ined. 
Date 
exam¬ 
ined. 
] 
t Total 
No. 
injur¬ 
ed 
twigs 
count¬ 
ed. 
Aver¬ 
age 
No. in¬ 
jured 
twigs 
per 
tree. 
Per 
Cent. 
Ben¬ 
efit. 
Conclusions. 
Lime and Sulfur.... 
14 Apr. 
38 
17 
9-18 My 
72 
4.23 
90 
Good. 
Arsenate of Lead.. 
14 Apr. 
3d 
16 
»( 
20 
1.25 
97 
Better. 
Check . 
No 
spray 
18 
8 
C6 
342 
42.75 
0 
Circumstances prevented the keeping of an exact record of the 
number of wormy peaches taken from each plat, but a very notice¬ 
able difference was noted at time of picking—a difference quite as 
marked and corresponding in results with the figures shown in the 
above table. In fact, the owner of the orchard invariably picked 
the wormy peaches from the plat not treated and found scarcely any 
fruit damaged in either of the plats sprayed. 
It may be said that arsenate of lead, applied in the spring at the 
time the buds of the peach are beginning to open, will control the 
peach twig-borei as effectually and cheaply as the lime and sulfur 
wash, up to this time the most universally used. 
Any arsenate of lead spray applied to peach trees must not contain 
free arsenic, as they are easily damaged by impure lead or lead di¬ 
luted with watei to contain too high a per cent of the poison, though 
puie. Groweis using 3 pounds lead per 50 gallons water were 
equally successful, and from the susceptibility of peach to injury, this 
latter strength is recommended, instead of the stronger spray used 
in the experiment reported above. 
PEACH-BORER. (Sanninoidea exitiosa Say.) 
Disttibution This dangerous insect has been found present in 
some peach orchards of the Western Slope. 
Our species is the same as the one found in Eastern states, causing 
such widespread damage to peach trees. It is evidently a pest which 
has come into the orchards along with nursery stock brought to us 
from some infested part of our country 
Injury and Life History —The injury is one resulting from the 
burrowing of a yellowish-white larva, which, when fully grown, some¬ 
times measures one and one-fourth inches in length. Signs’of the 
presence of the borer are the gummy exudations coming from the 
crown of the tree at the top of the ground. Infested trees examined 
early in the summer showed larvae of sizes varying from one-fourth 
to one and one-fourth inches in length. Some small larvae were 
then barely concealed beneath the peach gum on the outer bark. 
