4 
“ Wither-tip,” or “ Brownish-black Scab”— 
Introductory 
Florida disease of “ Die-back,” or “ Exanthema ” 
Symptoms 
Conditions favouring disease 
Cause 
Treatment 
References 
“ Bark Blotch ” of Lemon— 
Symptoms 
Cause 
Treatment 
Collar-rot— 
Historical 
Symptoms 
Effects ... 
Conditions favouring disease 
Cause 
How disease may be spread 
Varieties affected... 
History of disease in Australia 
Treatment 
References 
“ Root-rot” of Lemon — 
Introductory 
Symptoms and effects 
Other cases of Phoma on roots 
Cause of disease ... 
Treatment 
Page 
4.3 
44 
47 
47 
47 
48 
48 
53 
53 
54 
57 
57 
58 
59 
59 
60 
61 
61 
62 
65 
67 
67 
68 
68 
68 
Part II.— Technical Descriptions of the Various Fungi found 
upon Citrus Trees in Australia. 
Introductory ... ... ... ... ... ... 73 
Fungi on fruits ... ... ... ... ... ... 74 
Fungi on leaves ... ... ... ... ... ... 85 
Fungi on stems and branches ... ... ... ... ... 103 
Fungi on roots ... ... ... ... ... ... 112 
Fuugi on scale insects ... ... ... ... ... 112 
General remarks on treatment ... ... ... ... ... 114 
Explanation of terms ^ ... ... ... ... ... 115 
Nature, habitat, and distribution of fungi ... ... ... 117 
Appendix—1. Citrus species cultivated in Australia ... ... 119 
2. Letter from L. 0. Howard, Ph.D., Entomologist, 
concerning treatment of plants with hydrocyanic 
acid gas ... ... ... ... ... 119 
3. Return of quantity and value of oranges and lemons 
imported during 1897-8 ... ... ... 120 
Explanation of plates .. ... ... ... ... 121 
Chart of principal fungus diseases, and treatment ... ... — 
Index of common and scientific names of fungi ... ... ... 129 
