Lae ee 
EXPERIMENTS ON ORANGE INSECTS. 29 
TREES Nos. 21-28. 
Kight trees were left in different places unsprayed. October 6, twen- 
ty-four days after the others were sprayed, these trees were examined. 
They had been fair samples of the other infested trees, and showed the 
extent of damage that had been prevented by the murvite used on sur- 
rounding trees. They were in very bad condition; twigs dead; afew 
leaves at the ends of the branches ; no young growth. Microscopie ex- 
amination showed the presence of an unusual number of parasites and 
of male insects. (See table.) These trees were then sprayed with a so- 
lution of murvite 1 to 40 parts water. ~ 
Examined October 24. Storm and rain had bleached the marks on 
the labels so that they were illegible. Some living eggs and larve 
were found on all; the scales were nearly all remaining on the trees. 
The weather was quite cold. 
OTHER TREES. 
Many trees with P. pergandii were sprayed, but remanded to the gen- 
earal list for the reason that noreliable percentages could be obtained, on 
account of the habit this insect has of forming masses ; empty scales, 
young broods, eggs, are all so joined and overlapped that any attempt 
to separate only succeeded in taking away portions of individual seales. 
I ascertained that the application of strong solutions effectually killed 
both larvee and eggs, but I usually washed them off with water as soon 
as they were loosened with murvite. 
August 23.—Twenty trees in very bad condition, on well-drained land, 
have been well cultivated and highly fertilized. These trees were in- 
fested by a round seale (P. pergandii ). There are not very many oneach 
tree; the trees have lost wood; in some instances nearly all is dead 
down to 2 feet above the ground. Some have lost all the twigs; in all 
the bark is black and hard. Sprayed with solution of murvite 1 part 
to water 20 parts. 
Seven days later, find the scales loose; fourteen days later, trees show- 
ing budson infested wood ; one month after spraying, found shoots grow- 
ing; two months after spraying, trees growing vigorously. Owner 
sprayed the entire grove, including these, using weak solution of mur- 
vite. I found no living insects on any of the trees. 
