Guava 



( 301 ) 



Gum Tree, Blue 



GUAVA. 



The fruits of several species of Psidium (which 

 xi'i-) are known under this title, but the best are 

 produced by Guava pomiferum, montamim. and 

 cattleianum. All these may be grown in an inter- 

 mediate hoiue. and produce purplish. Plum-shaped 

 fruits, having a flavour somewhat- like that of a 

 Strawberry. A delicious preserve known as Gua\a 

 jelly can be made from these, or they may be used 

 fresh for dessert. 



GUAZUMA. 



Kvergreen stove trees (urtl. Sterculiacea;) that 

 will .succeed under the treatment advised for 





CUELUEII ROSE (ViBvuxfM OITLUS). 



Gtiaiacum. One species, tomentosa, has sotne 

 economic value, the timber being useful for sugar 

 barrels, while from the young growths a very 

 strong cordage fibre can be obtained. 



Principal Species : 



polybotrya, ]'>', sura., yol. tomentosa, iV, sum., yel. 

 (*//. Bubroma poly- ulmifolia, 40', sum., yel. 

 botrya). 



GUELDER ROSE. 



A popular name applied to Viburnum Opulus 

 (aril. Caprifoliacefc). It is a native shrub, growing 

 to a height of 10' or 12'. The typical plant bears 

 heads of whitish flowers in May, followed by bright 

 red fruits. The form usually cultivated has sterile 

 flowers with large while bracts. The heads are 

 large, globular, and very effective. It is easily 

 propagated by cuttings, and grows well in any 

 good soil. V. Opulus, variety sterile, is a useful 

 shrub for forcing. 



GUERNSEY LILY. 



A beautiful bulbous plant, of which immense 

 quantities are imported by bulb dealers in late 

 summer and early autumn. Early potting is very 

 important. For full particulars, w NI:IUXI: su:- 

 N1ENSIS. 



GUICHENOTIA. 



Curious Australian shrubs (ord. Sterculiaceae), 

 with downy steins and leaves, and small, whitish 

 or purplish flowers. The leaves are usually small 

 and narrow, the branches weak, and the largest 

 bushes rarely exceed 2' in height. Propagation, by 

 cuttings inserted in sandy peat under a bell-glass. 

 Soil, sandy peat. A cool greenhouse provides the 

 necessary protection. 



Principal Species : 



ledifolia, U' to 2', spr., macrantha, 1J' to 2', spr. 

 wh. pur. 



GUMMING OP GUMMOSIS. 



The exudation o resinous matter commonly 

 observed in Cherries, Plums, Peaches, and Nectar- 

 ines. Many of the so-called gums and resins of 

 commerce, as, for instance, Gum Arabic and Gum 

 Tragacantb, are the result of gummosis on the part 

 of certain trees in the cases noted, Acacias. In 

 cultivated fruits gumming is a wasting disease, 

 which every up-to-date cultivator does his best to 

 prevent, or cure. The wounds or fissures in the 

 bark from which the "gum" exudes may be caused 

 in a variety of ways. Dr. Beijerinck lays the 

 blame upon the action of a very contagious fungus 

 which he lias named Coryneum Beijerinckii. The 

 mycelium of this fungus appears to develop a 

 ferment that, penetrating from cell to cell of the 

 tissue, transforms the starch granules, cell walls, 

 etc., into gum. Diseased tissue is formed, fissures 

 appear, and the gum exudes. 



Commonly, however, gumming is to be traced 

 to very much simpler causes, which are well 

 within the power of the cultivator to prevent from 

 acting. Abrasions of the bark, through branches 

 being allowed to cross, and careless pruning in- 

 cluding too rash excision of large branches, the 

 making of jagged cuts, and pruning in frosty 

 weather are fertile causes, especially with Cherries 

 and Plums. The remedy here is careful pruning in 

 the summer and early autumn, which in itself will 

 reduce gumming to a minimum, and the dressing 

 of the wounds with some good styptic, such as 

 Stockholm tar. 



Injury from frost, and over-rich soil, are common 

 causes, and the two are usually very closely linked 

 together. It will always be seen that trees grow- 

 ing in rich soil suffer most severely from frost, and 

 gumming usually follows. Lifting and root prun- 

 ing in early autumn naturally suggest themselves 

 as correctives of an over-luxuriant habit on the 

 part of the trees. 



Hums and Cherries that are badly affected with 

 gumming can rarely be cured, but mild eases may 

 he ameliorated by (1) cutting out the affected 

 parts, where the branches are not too large; (2) 

 due attention to summer pinching, thus obviating 

 the necessity for much winter pruning : (:!) dressing 

 with Stockholm tar; (-O keeping the trees fiee 

 from insect enemies ; (5) choosing varieties suit- 

 able to the locality. 



GUM TREE, BLUE (<: EUCALYPTUS). 



(iiiiiini I'fui'li (xi'c fyirn>cf]>halus). 



lintil . I ninnniiilr (.r llnrt'inil . I ni nn'i/itlfinii ). 



(ill HI ('iftlllt (HIT Cist MX llllllllliflTUS). 



Hum I'.li-iiii (< Ami/fix I'linnii'ri). 

 (in in . 



