ttged, and en 

 not neoessar 

 also for the rt 

 a number of 



cial inducen^ 



peciesandvarietii-s 

 ist decreasing or liii 

 i. Aside from tlic li 

 iimercial prowor, it 



prove instructive to the botanist and afford infinite 

 pleasure and pastime for the amateur. 



/)ise«ses. — Orchids are subject to many diseases. 

 Those having importance from a cnlfnral ^ramlpc.int and 

 most troublesome to the grower aie known as wet- and 

 dry-rot and spot. Wet-rot is cans, .1 l,y an •.vermoist or 

 stagnant atmosphere, and is usuall\ liist ileiec'ted by i 



, which 



mis wilh a sharp 

 3 airy position 

 caused by t 



fuu- 



semi-transparent appearance ot 

 soon become darli brown. It s] 

 tissue. If noticed at the coi 

 readily checlied by slitting the 

 knife and removing the plant to 

 the house for a few days. Dry 



gus which attacks the rhizome of the plant. It is ofte 

 produced through burying the rhizome or base of the 

 plant with compost. Cypripediums are subject to it. 

 Large, healthy growths when attacked quickly show a 

 sickly pale color in the foliage, which, on examination of 

 the base, will he found discolored, and with a light 

 brown :i]ii>e:n-;iiice. If the portion attacked is quickly 

 remo\i I ^^ iih :i ii up knife it will usually give no fur- 

 ther It .1.1 .ise it will travel through the en- 

 tire ill I . I i I roy the plant in a very short time. 

 Sp"t I iiK - ii'iii various causes: the appearance of 

 small dark brown spots on the succulent leaves and 

 pseudobulbs is usually an indication of cold aud over- 

 watering. Spot also arises through weak tissue, espe- 

 cially in Phalffinopsis, Saccolabiums and Angra?curas 

 during winter, which have been grown too warm, shady 

 The affected parts should be slit with a 



sharp knife and a little flowers of sulfur should be 

 rubbed over the wound. When they make new growth 

 the plants should be placed in a brighter and more airy 

 position to induce a better growth. The brown dots whicji 

 make their appearance on the leaves, especially at the 



to the cultivator. They can be kept in subjection only 

 by constant attention. Slugs aud shell snails are very 

 destructive. If allowed to increase they devour young 

 shoots, roots and flower-buds. The best means of captur- 

 ing them is to place saucers of dry bran on the shelves 

 among the pots, and look them over morning and even- 

 ing. By this means many will be destroyed. Various 



pec"es of scale nsects attach themselves to the leave- 

 pse dobulbs and rh zomes f nearl) all s] ec es of Or 



h Is and can be erad cated only by the use of a soft bru h 

 and wash ng w th a sponge a 1 V 1 1 1 le 



o 1 s p a I led o the vater of I 



il u f ul de t oy ng re 1 sp 1 1 



fl> Bl k , 





Fum g 

 th e 

 appea 



ps i 



J 5 



; nent wl 



li 3 eas l> d ngu she 1 

 The only remedy s to remove the gro vtl 11 r t 

 The matuie fly can be eralcatel ly fun gat n^, tie 

 house with tobacco stems about three times each week 

 during early spring. 



The Dendrobium beetle larva burrows in the stems of 

 various species of the genus, and is detected by a small 

 discolored spot. There is no remedy, except to cut 

 away and desti-oy the parts attacked. An insect which 

 is niuch more to be dreaded 

 which perforates the canes and rhizomes 

 biums and many other Orclii.N, lavii,.' a 

 eggs in each perforation. On haicinri ili. 

 a part of the plant around tlicni, .:i 

 decay. They can be foumi "iil\ ( 

 observation, and this often aftn- ih. phm 

 redemption. There is no renuMly Init. cnttiii 

 and unless the plant attacked is valuable i 

 burn it and keep the pest from spreading. 



Mealy bug is usually not very troubles 



chidi 



injury ti 



Roach 



through 



<lered s'l 



bout much 



arc usuallv vcrv t r(.ul.les..nie, and hard to 

 s lie V fce,l at" ni-lit an.l renniin hidden 

 I- ilaviiine. Tlii-v .Icstn.v roots, growing 

 young tlower-bmls and scales. Bran, pow- 



and Paris green, inixc.l tc^-ctlier and placed 

 liouses in saui-crs. will nsnally keep them in 

 and they should be Ininleil "down at night 



if a lantern. Many can be caught in this 



Siiw liiiu's 1.1- wood lice are usually common in every 

 part of Orcliid lionses, pots and baskets. They do a 

 great deal of damage to young leaves, roots and the ten- 

 der portions of flower-scapes. The Paris green mixttire 

 used for roaches is very effectual in reducing their 

 number, but it is impossible to be entirely freed from 

 them. Robert M. Grey. 



