x] Beetles 117 
June and July. The garden chafer also appears in 
June and July, and flies about in bright sunshine. 
These chafers sometimes feed on young apples. 
The green rose chafer flies about during the day 
and appears at the same time as the cockchafer. The 
adults are especially harmful to the flowers of roses, 
strawberries and turnips. 
Remedial Measures. 
These grubs feed chiefly on grass land and hence 
are extremely difficult to eradicate. Surface applica- 
tion seems to be of little value, as the grubs can descend 
out of its reach. It is chiefly against the adult stage 
that measures must be taken as they are then more 
likely to succeed. On the continent co-operative 
attacks are made against the adult chafers which 
never travel far to lay their eggs; hence the districts 
in which they are destroyed reap the benefit. 
In this country the summer chafer and the garden 
chafer seem to be the cause of most of the damage. 
The cockchafer is very local, but may be abundant in 
those districts in which it is found. 
The importance of knowing the life history of these 
chafers is evident if we are attacking them at the 
adult stage. It takes four years for cockchafers to 
produce another brood of cockchafers, so that having 
noted when the beetles are numerous we know when to 
expect the next brood. The date of appearance is also 
important. We must be prepared to attack the cock- 
chafer and the green rose chafer in May before they have 
laid their eggs, as no advantage is gained by destroying 
them afterwards, whereas the summer chafer and the 
garden chafer do not appear until June. The small 
