516 
THE GARDENING WORLD. 
June 18, 1964. 
the fungus which come outside the leaves, and perhaps keep it m 
check. Remove and bum all affected leaves, and keep the foliage 
as dry as possible. Do not crowd the plants, but let them have all 
the air possible. We do not think the disease so virulent as at 
first, and by taking the above precautions yon will keep it from 
doing much harm. 
Acer Lg&vgs. 
I send you herewith some of the leaves of the butter tree, taken 
off on the 29th ins-t. I have compared them with the leaves of 
the young; plants sent me by Messrs. Gheal as Acer Girina la 
tataricum, and I think they are identical. The blossom had 
all fallen off the tree on the 29th. (M. M'Laren.) 
The leaves you sent were those of Acer tartaricum, being 
rather larger than those of A. Ginnala and more downy. A. 
Ginnala- is sometimes considered a variety of the other, but 
we now regard it as a distinct species. If you desire to regard 
the one as a form of the other, it would be correct to' place A. 
tartaricum first. A. Ginnala has nearly orbicular 7-lobed leaves. 
Grubs in Fir Trees. 
Could you tell me through The Gardening World, of which 
I am a subscriber, the best remedy, if there is one, against the 
grubs in the tops of the Firs? Shoots I enclose in box. Also 
if they originate from moth, and what season? Also give name 
and all particulars, if it is not taking up too much of your 
valuable paper? (F. H. S.) . . ,, 
Your trees are infested with the Pine-shoot Tortnx moth 
(Retinia buoliana). The perfect moth may be found during July 
about young Fir trees, when the fern ale busies herself laying 
eggs between the shoots at the end! of the branches. The cater¬ 
pillars hatch out late in summer, and commence gnawing the 
side of the shoots. This causes a flow of resin, and with t-liis 
and threads they form a covering under which they rest till 
spring, when they again commence feeding on the young shoots. 
The grubs become full fed in June, and form a chrysalis, in 
which they remain till July, when they become moths. The 
latter are about lin. in expanse of the wings, and are reddish 
y-ellow, becoming darker towards the tip. The moths swarm 
round the tops of the trees in the dusk of the evening, but rest 
durino- the day. To lessen future attack you should exit off all 
affected shoots at once, and burn them before the moths leave 
the shoots. If done earlier in the season it would have been 
better, but that need not prevent you proceeding with the work 
at once. By doing this you will encourage the growth of the 
healthy shoots. You could also search for the moths while they 
are resting during the day, destroying as many of them as you 
can. On young trees you will be able to- get at them. It magnt 
be worth while also to syringe the trees at intervals of ten days 
during July to drive away the female moths laying eggs. A 
wash that might be tried is 41bs. of soft soap to 20 gallons of 
water, adding the juice of P>. of tobacco. Ply this Well about 
the base of the young shoots where egg-laying takes- place. I his 
washing is of the nature of an experiment, and may be he-lplui, 
while it will do no- harm. 
Roses Dropping. ,, ^ ... 
Would you kindly answer in your paper ? All my Rose-s this 
year have the foliage dropped off and leaving the shoots bare. 
Also the buds grow to the size of the enclosed, and- then drop 
off at the joint in the centre of the stem. Would you let me 
know the cause -and cure, if possible ? Wishing your paper 
Judging from the- specimens sent us it is due to some form 
of bad°culture, and we suspect the trouble comes from the roots. 
Either the drainage is bad and the pots are water-logged -or you 
have been feeding too heavily with some concentrated -artancial 
manure. The bud sent us had decayed in the centre, suggesting 
trouble from the roots, and, judging from the fact that the leaves 
-all dropped off, this would also point to the same conclusion. 
These are the suggestions we should throw out and ask you to 
consider if you have been doing anything -that would he likely 
to have brought about the trouble in this way. 
Apple Trees Browned. 
I enclose you some specimens of Apple leaves. Two trees have 
the leaves most unhealthy in appearance, and I should feel 
obliged if you could tell me what is the -cause, and also the 
remedy. (Novice.) „ . , 
We have examined the leaves, and fail to find either insects or 
fungi. The appearance suggests damage either through syring¬ 
ing with some insecticide that has been too strong, or, what is 
more probable, the young leaves have been frost-bitten some time 
ago during the cold weather, when the leaves were freshly ex¬ 
panded. We are led to this conclusion because otherwise the 
leaves seem healthy enough, and t-he markings have no-t increased 
since we- had the leaves, although the leaves have kept fresh. 
Grapes Rusty. 
Can you kindly inform me what has caused these Grapes to . 
be marked like this? I am greatly distressed about them, and 
would like to know the cause, and also how' to- remedy it, as 
there are a lot of them like these. (Veg-Veen.) 
Your Grapes are affected by what is known as rust. They 
are veiy badly affected, too-, for we s-eldom see the berries so 
completely-spoiled. There are many causes tha-t would tend to 
produce rust, but judging from the way the markings run 
round the berries and in places run to the top in lines, it 
must have been caused in a special way. It is our opinion that 
the houses had been kept closed, till too- late a period of the 
day at a time when the skin of the berries was very delicate. 
Then we imagine that the ventilators were opened to reduce the 
temperature, and tha-t there was moisture on the berries which 
condensed and ran down towards the tips while the cold air was 
blowing in upon them. The skin of the Grape is very sensitive 
during the early stages, and the appearance they now present 
must have been caused some weeks- ago- when the berries were yet 
quite small. They are now unable to swell regularly, owing to 
the damage done to the berries in places. The only thing you 
can do now is to remove all the most unsightly of the berries 
and use every precaution with the rest by ventilating sufficiently 
early in the morning to let the berries dry before the sun shines 
strongly upon them. 
Names of Plants. 
(F. Goddard) Senecio Kaempferi aureo-maculatus.—(F. C., 
Purley) 1, Begonia semperflo-rens Snowflake ; 2, Begonia 
weltoniensis ; 3, Begonia margarita-oe-a ; 4, Begonia fuclisioides 
var. ; 5, Begonia hybrid, not recognised ; 6, Begonia semper- 
florens var. ; 7, Begonia co-rallina; 8, Begonia glaucophylla 
splendens ; 9, Begonia Arthur Mallet; 10, Begonia oorallina 
(the two plants of this are only stages of the plant or slight 
varieties).—(D. Rodger) 1, Onosma tauricum ; 2, Limnanthes 
Douglasii; 3, Claytonia sibirica; 4, Asperula odorata (Wood¬ 
ruff) ; 5, Alchemilla conjuncta ; 6, Potentilla alba ; 7, Viburnum 
Lantana.— (R. M.) 1, Claytonia sibirica ; 2, Saxifraga decipiens ; 
3, Saxifraga macnabiana ; 4, Sapo-naria ooymonies ; 5, _ Ajuga 
genevensis ; 6, Silen-e maritima; 7, Euphorbia Cyparissias; 8, 
Lamium maculatum.—(G. R.) 1, Dendro-bium Bensoniae; 2, 
Oncidium varicosum ; 3, Cypripedium Godefroyae; 4, Odonto- 
glossum Pescatorei ; 5, Oncidium pumilum.—(0. !M.) 1, Iris 
sibirica ; 2, Iris variegata ; 3, Geranium ibericum ; 4, Oxa-lis 
fio-ribunda ; 5, Hemerocallis lute-a ; 6, Lilium pyrenaicum ; 7, 
Veronica Teucrium dubia,—(T. B. J.) 1, Saxifraga Aizoon ; 2, 
Saxifraga- rotundifolia ; 3, Lup-inus po-lyphyllus; 4, Erigeron 
philadelphicus ; 5,,,Veronica sp-icata ; 6, Saxifraga cuneifolia. 
Communications Received. 
W. H. Long.—J. Pinches.—W. F.—Jas. Bethel.—H. Arnold. 
—A. T. Matthews.—S. A.—R. D.—W. R.—F. J. E. A. S.—■ 
D. P.— A. C.— E. M. R.-A. F.—H. C.—E. R. W.—W. T. 
-A. P— B. N. 
CONTENTS OF THIS WEEK. 
PAGE 
Begonia President Carnot... 506 
Cardamine pratensis, plants 
on the leaves of..... 499 
Chrysanthemums for the 
garden. 606 
Coombe Wood .. 503 
Embothrium coccineum. 510 
Forget-me-not, the Wood ... 499 
Fruit under glass. 501 
Gardening, on learning . 509 
Holiday tours, Swiss . 499 
Kitchen garden, the. 502 
Mentzelia Lindleyi . 508 
News of the week.. 513 
(Jdontoglossum wilckea- 
num The Alake . 510 
Odontoglossum wilckea- 
num albens Rosslyn var. . 510 
Orchids, among the. 500 
Parasitic progress... 510 
Phenological observations ... 507 
Plant breeding, pedigree ... 509 
Plants recently certificated . 516 
Poisonous plants, excursion¬ 
ists and . 499 
PAGE 
Potato novelties—then and 
now . 503 
Primroses, hybrid. 502 
Primula Sieboldii. 503 
Questions and answers . 514 
Rose Gloire de Dijon, rever¬ 
sion . 499 
Saxifraga, a hybrid. 505 
Seed, the life of a. 502 
Societies : 
Royal Botanic . 511 
Royal Horticultural. 512 
Society and association 
notes. 513 
Staking of herbaceous plants 506 
Stove and greenhouse. 501 
’ Trees and shrubs, hardy. 500 
Weeds, how to fight . 508 
ILLUSTRATIONS. 
Embothrium coccineum . 510 
Mentzelia Lindleyi (see Sup¬ 
plement). 
Potatos, notable . 503 
Saxifraga Cotyledon x Hostii 505 
