x] Beetles 127 
into the seeds. Each larva pupates in the seed 
where it has fed and the beetles formed from these 
also remain in the seed for some time. The seeds in 
which the beetles occur have a small round pit in the 
skin of rather different colour from the rest; no holes 
are made until the beetles escape. 
Remedial Measures. 
The beetles may be destroyed by fumigating with 
carbon disulphide as in the case of grain weevils (see 
p. 121). 
When seeds that have been attacked are sown they 
take longer to germinate and under adverse conditions 
may not produce healthy plants; under favourable 
conditions however plants very similar to those from 
healthy seed are produced, the only difference being 
that they are delayed a few days in the young stage. 
CHAPTER XI 
FLIES 
Frit Fly (Oscinus frit). 
This pest has recently caused a considerable loss 
to farmers in its attacks on the oat crop. In outward 
appearance the affected oats closely resemble those 
attacked by an eelworm known as Tylenchus (see 
p. 168), and it is only by a careful examination that 
the real culprit can be found. Occasionally both of 
them occur in the same plant. In a badly infested 
