80 PIOTORIAL PRACTICAL ROSE GROWING. 
Rose Grub. 
The larva of Tortrix Bergmanniana is a common pest on 
Roses late in spring. It must be checked by handpicking. 
Mildew. 
Rose mildew, the fungus Sphezrotheca pannosa, is one of 
the many pests of Roses. It attacks plants both in the open 
air and under glass, covering them with a whitish down, and 
causing loss of foliage and general ill-health. 
Mildew is not usually a source of serious trouble on out- 
door Roses when the soil is deeply and well cultivated, and 
the plants are well fed. Yet unkindly weather may predispose 
them to attack. 
Plants under glass are almost sure to be affected if cold 
draughts blow on them, and not a few cultivators screw down 
their ventilators late in summer in order to prevent any 
risk of an attack from this source. 
The favourite remedy for mildew is flowers of sulphur, 
which is usually dusted on by hand. It is often effectual, 
especially if applied during an early stage of the attack. 
Those persons who have many Roses would do well to procure 
a pair of Malbec bellows from the florist or sundriesman, as 
with their aid the sulphur (which may with advantage be 
mixed with one-third of lime) can be thoroughly distributed, 
both on the under and upper surface of the leaves. 
A modern remedy for mildew which is worthy of mention 
is liver of sulphur (sulphide of potassium). Half an oz. of this 
ill-smelling substance may be dissolved in 13% gallons of hot 
water and sprayed on. 
Orange Fungus or Red Rust. 
When the experienced Rose grower observes orange-yellow 
spots on the leaves of his plants in early summer he knows 
that he sees the advance guard of the fungoid disease known 
variously as orange fungus and red rust. 
Some suppose these to be separate diseases; on the con- 
trary they are separate stages in the triune life-cycle of one 
disease, Phragmidium subcorticatum. The first, or Avcidium, 
stage, gives the orange fungus; the second, or Uredo stage, 
(References to Fig. 37, page 81.) 
PICTORIAL PRACTICE.—PLAIN HINTS IN FEW° WORDS. 
FIG. 37.—MILDEW ON ROSES. 
A, affected growths of Hybrid Perpetual Roses: a, first or summer growth 
which has been shortened after flowering to induce vigorous second 
growths to push for the second blooming; %, second or so-called 
autumnal shoots; ¢, an attack of fungus on the wood; d, leaves infested, 
B, the summer form of the fungus, popularly known as mildew: e, the 
