54 
PEAR. 
cannot be reached, spreading a coat of quick-lime on a dry day beneath 
the tree and then slaking it would make much of the infested fruit 
fall, and the lime would be ready to destroy escaping maggots. 
In orchards growing on grass-land a deal of infested fruit may be 
got rid of by having sheep on the ground ; they will clear off various 
kinds of fruit with the contained insects, and I have known them 
specially partial to fallen Damsons. 
Where the roots are not on the surface, it would be desirable to 
clear away a few inches of the top soil from under infested trees 
as soon as the stunted and maggoty Pears are down, and treat it 
in any way that would destroy the contained grubs. 
Moth Blight, Snowy Fly, or Powdered Wing. A ley rode ,s 
PJallyrrer, Signoret, and other species. 
Aleyrodes peoletella, Linn. 
Snowy Fly and early stage on leaf, twice nat. size. Fly and under side of pupa, 
much magnified. 
The kind of Snowy Fly which is most important practically is that 
figured above, which infests various sorts of Cabbage. It may be 
found more or less all the year round, and sometimes occurs in great 
numbers, which rise like a quantity of minute snow-flakes on any 
disturbance of the plants they infest. These “ Moth blights,” as they 
are sometimes called, lay their eggs in patches on the Cabbage leaves. 
The larvae or maggots, which hatch from these eggs, are much like 
very small white or yellowish scales in appearance, and sticking fast 
to the leafage, to which they do much harm by drawing away the 
juices with their suckers. 
The various kinds of Aleyrodes (see observations on Aleyrodes by 
Dr. Signoret) resemble each other in being whitish, and covered with 
a kind of mealy powder, from which they take their name, and which ft 
is to be found like white dust on the leaves they frequent. Their 
