e 
CENTRAL TRIAL STATION. 47 
one tablespoonful of Paris green to each pailful of paint. This has 
proved a very effectual remedy. 
Plum Aphis. This year the plum tree aphis was very injurious 
to native varieties of plums all over the country. At the Experi- 
ment Station the trees were so badly infested that even the fruit 
stems were often completely covered with them. They were so 
abundant that spraying with kerosene emulsion and tobacco water 
afforded very little relief, as the leaves curled up very nearly and 
thus protected the insects from these solutions. Under these condi- 
tions I resolved to try tobacco smoke. In order to use the smoke 
most successfully it was necessary to confine it around the tree 
and after trying various styles of tents the tolowingsw was found 
the most practicable (Fig. 4). Our 
trees spread about sixteen feet 
in diameter and are about six- 
teen feet in height. We made 
two frames, as shown in figure 
4, of 2-in. x 3-in. pime. The up- 
rights are sixteen feet long and 
cross pieces eight feet long. In 
the cross piece of one frame are 
two large staples made of one- 
fourth inch iron andonthecross _- —lkL 
piece of the other are two pins — —~_-—~— 
two inches long corresponding 7 (Figure 4) 
to the staples in the other; so that when the frames were raised the 
iron pins would go through the staples and the two frames would 
be keyed together, thus making what was practically a horse eight 
feet long with legs sixteen feet long and stiff enough to support the 
weight of a man or the tent cloth. This frame would also shut 
together, so that by the use of a guy rope it could be set up or 
moved easily by three men. 
The tent cloth is made in 
Be - two parts, one part being 
ee hooked securely by its upper 
edge to the upper side of one 
of the cross pieces of the 
frame. The other cloth was 
not put oi until the frame was 
over the tree, as shown in fig- 
ure 5. Itis quite an easy mat- 
ter for three men to handle 
the frame with half the tent 
cloth attached, and we found 
itthe most expeditious to move 
the tent with this attached 
whenever the trees were near 
together. In some places it 
it might be best to unhook 
(Figure 5.) the cloth and set up the frame 
and then by means of a ladder put on the cloth. We have done this 
