BITTER PIT INVESTIGATION. 



FIFTH REPORT. 



CO XT EXTS. 



PAGE 



Introduction . . . . . . . . . . . . . . . . . . . . . - - . . 5 



I. Among tlic Orchards the abundant Yield in relation to Pit . . . . . . . . . . . . 7 



Box Hill 7 



Deepdene . . . . . . . . . . . . . . . . . 7 



( irecnsborough . . . . . . . . . . . . . . . . . . . . . 7 



Burnley Horticultural Gardens . . . . . . . . . . . . . . . . . . 8 



II. "Crinkle," a confluent form of Bitter I'it . . . . . . . . . . . . . . . . . . 10 



III. Diseases superficially resembling Bitter Pit .. .. .. .. .. .. .. .. 11 



"Jonathan Spot" Name of the Disease . . . . . . . . . . . . . . 11 



Occurrence . . . . . . . . . . . . . . . . . . 12 



Weather Conditions . . . . . . . . . . . . . . . . 12 



Chemical Analysis of Jonathan Apple . . . . . . . . . . 13 



Cause of the Disease . . . . . . . . . . . . . . 14 



Preventive Measures . . . . . . . . . . . . . . 14 



Stigmonose in Australia, France, and America . . . . . . . . . . . . . . 14 



Bitter Rot confounded with Bitter Pit . . . . . . . . . . . . . . . . 16 



IV. The Fruit-buds of the Apple tree . . 16 



Their Position . . . . . . . . . . . . . . . . . . . . . . 17 



Their Origin 17 



Period of Formation . . . . . . . . . . . . . . . . . . . . 17 



Their Treatment . . . . . . . . . . . . . . . . . . . . . . 18 



V. Pruning Experiments with Jonathan, London Pippin, and King David Apple trees grown in pots 19 



VI. Effect of Ringing and Constricting the Branches of Apple and Pear tree . . : . . . . . 22 



VII. Experiments conducted under natural conditions with a view to controlling the Disease . . . . 24 



A. Manurial Experiments 1. Box Hill, Victoria . . . . . . . . . . . . 24 



2. Bathurst, New South Wales 26 



3. Stanthorpe, Queensland . . . . . . . . . . 29 



4. Blackwood, South Australia . . . . . . . . 29 



5. Mount Barker Estate, Western Australia . . . . . . 31 



