87 



at the rate of one ounce, dissolved in four gallons of water. Spraying was 

 .■onunenced when the leaves were partly expanded, and re!)eatMl seven or 

 eight times during the summer. 



Without actual experiment, it would not he wise to recommend the unre- 

 strictetl use of any remedy for this disease, but from our present knowledge 

 of the general efficacy of the ammouiacal copper curUonate. it seems safe to 

 .•idvise a trial, at any rate, of this remedy, in the same iiroportions as tho.se 

 given fur the apple or graiio. viz. ; — 



I'arhouate of copper - oz. 



Ammonia 1 ' j pints. 



Water -'< f;als. 



— Vviitnil H.viirihiiciiliil I'diiii. IliillcHil .Yo. 10. 



Uosi-: Jlii.DEW [Siiliarotlicca jiiniiin.sd.) . 

 Very little description is needed of this only too w<'ll-linown rose affection 

 which clothes, with a felty. whitish mass of interwoven threads, the leaves, 

 twigs and flower-stalUs of ro.ses. The treatment is to dust affected plants .with 

 tlowers of sulphur mixed with one-third its volume of sl.-iked lime. Spraying 

 with potassium sulphide — 1 oz. to 2 gallons waters-is also eipially efflcacious. 

 In this, as in all similar cases, it cannot be too strongly urged that all the 

 diseaseil jiarts should be cut off and burnt to prevent the dissemination of the 

 spores. Vigorous treatment always minimises disease. — \ew Zealand Bull., 

 Xu. oO. 



Powdery Mildew. 



I'(iw<lcr.v mildew i. I'lidnsiiliirio o.ri/acinitlia) occurs all through the coast 

 distri<ts on orchard trees. It usually appears in spring or early summer, 

 especially during unfavinirable seasons for growth. On nursery stock it is 

 often later in making its appearance. It appears first as small, round whitish 

 blotches, which soon enlarge and run tugether on the leaves and .young shoots. 

 The mildew is compo.sed of a vast number of miiuite white threads, branching 

 in all directions, which form the mycelium or "plant body" of the fungus. 

 Soon after this mycelium gets well developed it a.ssumes a powdery appear- 

 ance, due to the production of (luantities of minute white spores, which serve 

 to sjjread the disease during the growing season. Towards the end of summer 

 the niyicliuni dcveloi's sni.ill nunid lil.ick masses, just visible to the naked 

 eye. and these are the cases which contain the winter spores and carry the 

 fungus thnjugh the winter. 



Trcaliiiciit. 



In orchards, cutting nlT and burning any shoots which show the fungus is 

 the simplest method of treatment ; nursery stock may be protected by spraying 

 with P.ordeaux mixture, or the carbonate of copper spray, which should be 

 repeated at intervals of ten days, for three or four sprayings. 



Apple TuiiE JIiLDiav { Sjilunotlirra muli. Magnus.). 



The disease known as Apple Tree Mildew is a close ally of the hop mildew, 

 .\merican gooseberry mildew, and rose nuldew. It is very i)revalent, and is 

 one of those pests likely to accompany apple trees to all parts of the world. 

 as the mycelium is believed to tide over the winter in tlic> bark or between the 

 bud scales, and thus e.seaiie detection. 



