66 
THE PLUM TREE. 
Aphis. — Tiiis tree is attacked sometimes hy a 
similar kind of Aphis to the green one described 
on the Apple tree, but not the same, as it appears 
they are not oviptu'ous ; the effects produced while 
feeding cause the leaves to curl or fold up. 
For their Destruction. — Apply the Mix- 
ture (No. 1) at the end of April or beginning of 
May, when the insects first make their appearance, 
providing the trees are not in full bloom. If 
the operation is neglected till the leaves become 
curled it will be necessary to pick them off previous 
to the ajjplication. 
The Aphis, or Mealy Leaf Louse. — 
This species is rather larger than those already de- 
scribed upon Apples; they have the appearance 
of being dusted over with flour or meal, which 
transpires from the body of the insect when 
in the act of feeding. I am not quite certain 
whether at any time this species, like the former 
one described on the Apple tree, is oviparous. If 
so, the egg must be deposited in the earth, as I 
never discovered them at any time upon the trees, 
shreds, or walls ; but it is certain some of the 
latter cletch produced in October, like the Aphis 
Lanegera, survive the winter, protected in cre- 
vices of the tree, walls, or other concealments, 
and others descend into the earth, and in the 
spring ascend the tree, and station themselves on 
the underside of the leaves, and although those 
surviving at fiist be ever so few, they arc so mul- 
