EXPERIMENTS OX ORANGE INSECTS. 29 
Trees Xos. 21-28. 
Eight 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: a few 
leaves at the ends of the branches ; no young growth. Microscopic ex- 
animation 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 larvae 
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- 
eral list for the reason that no reliable 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 scales. 
I ascertained that the application of strong solutions effectually "killed 
both larva? and eggs, but I usually washed them oft' 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 iu- 
fested by a round scale (P. pergandii). There are not very many on each 
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 buds on infested wood; one month after spraying. found shoots grow- 
ing; two months after spraying, trees growing vigorously. Uwner 
Sprayed the entire grove, including these, using weak solution of mur- 
vite. I found no living insects on any of the ton 
