20 THE ORCHID REVIEW. {January, 1906. 
in the morning, and removed, then freshly scraped out, and replaced in the 
evening. Wood-lice have a great partiality to Cattleya roots, with a weak- 
ness for root-caps. 
SLuGs AND SNAILS.—I have found succulent lettuce leaves the best bait 
for slugs and snails. The leaves should be placed about on the plants when 
growing dusk, and examined by lantern light last thing. Bran is also used 
as a bait, but, strangely, I have never had any success with it. Orange 
peel can also be tried. Incidentally, the spikes are the best bait, and 
these should also be examined. These slimy marauders are hardly ever 
found in the Warm houses, but are the chief insect pest of the Cool house, 
and if not assiduously searched for they play great havoc among the grow- 
ing spikes. Where no risk is to be taken, the plant should be placed on an 
inverted pot standing in a saucer full of water, making sure that the leaves 
do not touch adjacent plants. Cotton wool wound round the base of the 
spike also prevents the slugs from creeping up. 
Turies are fairly indiscriminate in their attacks, although some classes 
—even species—are much more addicted to them than others. Here, again, 
dryness and heat are conducive to their prosperity, but they make their 
appearance sometimes for no apparent cause whatever, and from goodness 
knows where. Fumigation is the antidote. When thrips appear on only 
two or three plants, as they frequently do, these should be washed, and.an 
eye kept on the surrounding plants. They are with us more or less all the 
winter, and usually pay us a severe visitation about midsummer. If @ 
house full of plants is badly infested, it should be fumigated two or three 
times at intervals of two or three days. Fumigation is not good for the 
plants—even with ‘‘ XL. All”—and completely changes the colour of some 
flowers. Plants in flower should therefore be removed before fumigating. 
RED SPIDER is not very troublesome among Orchids, but it sometimes 
attacks Dendrobiums. A hot, arid atmosphere is again the cause. It can 
only be got rid of by washing all the leaves on the underside with some 
insecticide, or sulphur, as fumigation, at a strength safe to use, does it no 
harm. 
CatTLeya FLry.—We hear very little of the Cattleya fly nowadays, and 
I hope it is extinct in collections. It was introduced with Cattleya labiata 
eleven or twelve years ago in enormous quantities, and menaced many 
collections into which it found its way. Fumigation and cutting off the 
affected young growths was as far, I think, as the means of eradication went. 
There is also a Cattleya-root fly in some collections. It can be discovered 
by the root swelling up into nodules. If these are cut open grubs will be 
found inside. When these swellings appear, the root should be cut off and 
burned. 
It will be well to procure this month a good supply of peat, and have it 
