Sawflies Injurious to Rose Foliage. 13 
able it will bore into the pith of these and construct a gallery and 
cell for its resting stage. 
In the southern range of the species there are two generations, 
one having a short life cycle of several days more than a month 
and the other occupying the remainder of the year. 
HOW TO CONTROL ROSE SLUGS AND PROTECT THE 
FOLIAGE. 
The control of these pests is easy. So simple a thing as a strong 
stream of water applied often and from different angles is a remedy 
in that it knocks the larvee from the leaves and they perish before 
they are able to return. In places where a strong stream of water 
is either unavailable or inconvenient to use, a stomach poison like 
lead arsenate and water sprayed upon the leaves gives good results. 
If the spraying is to be extensive and a large quantity of the mix- 
ture is to be used, 1 pound of powdered lead arsenate to 50 gallons 
of water is the proper proportion anc a large compressed-air hand 
sprayer or barrel pump will be found suitable. If the spraying is 
to be limited to several bushes 3 rounded teaspoonfuls of powdered 
lead arsenate to a gallon of water is a good mixture and one of the 
small hand spray pumps will serve the purpose. 
Another spray which will be effective against young larve and 
which has the additional advantage of being a good aphid remedy 
is 40 per cent nicotine sulphate which should be diluted as recom- 
mended upon the container, usually 1 part to 800 parts of water in 
which some fish-oil or laundry soap has been dissolved. For small 
quantities use approximately 1 teaspoonful of the nicotine sulphate 
to 1 gallon of water in which 1 ounce of soap has been dissolved. 
The life cycles and the number of generations have been discussed 
in this paper in order that those whose plants are infested may be 
< Me to determine for themselves whether it will be necessary to 
Spi ay once or a number of times during the year. 
Since the European rose slug spends most of the year in cells or 
resting chambers in the ground, thorough working of the soil will 
help to reduce its numbers, by breaking up the cells and exposing 
the soft, weak, unprotected pupz to the weather and various preda- 
tory enemies. 
The coiled roseworm may also be combated by painting the ends 
of pruned twigs, removing all pithy stems and brashy wood, and 
leaving no suitable hibernating place available. 
The bristly rose slug can be destroyed in large numbers by burning 
the old leaves and other litter in which they have spun cocoons. 
Hence clean cultural methods are to be strongly recommended as a 
means of insect control in the growing of roses. 
