Joi’K. Kov. So(\ Western Australia, VoIv. XII^ No. 3. 1.'5 
A Brown Rot o,f Citrus in Australia (Phytophthora hiberna- 
lis n.sp) by W, M. Came, F.L.S.. Economic Botanist and Plant 
Patholo^^ist, Dept, of Agriculture, W.A. 
t^iicad November 10, 192d. PithUshed .December 211, 1925.) 
Tlie pathogen hei'ein (le.scril)ed is believed l)y the 'writer to be 
responsible for tlie disease known as Citrus Brown Rot in Australia, 
wliieli in tlie jiast has Ijeen attrilnited to Ptjthiaci/Ntis cifrophthoi 
Sm. & Bm. P. citrophiliora is tlie cause of a similar disease n 
California, but the writer has failed to find any definite evidence 
of its occurrence in Australia. It has been recorded without draw- 
ings or cultural notes from Queensland, Victoria, South and Western 
Australia. Bxaminatioii of many hundreds of affected fruits In 
Western Australia has resulted in the finding of the new species 
Jdiytophthora hihcnialis, and that only. A typical broAvn-rotted 
orange foiAvarded by Raiiiuel from South Australia proved t<i be 
affected with the same fungus. Unfortunately neither specinums or 
cultures have been olitainabie from the other States. The reniark- 
alile similarity of the published symptoms of the disease occurring 
in \'ictoria Avith tliat in Soutli and Western Anstialia makes it 
highly probalile, in the absence of cultural evidence to the contrary, 
that tlie causes are identical. 
J\ citrophthom was described from California in 190(i i29). 
Later records from Florida, (hiba and the Isle of Pines liave sin-, c* 
lieen admitte l to be in error, owing to confusion with Plnjiophthora 
terrestriH Sherb. (12). Brown Rot diseases of citrus fruit occur iii 
Spain, Italy and Portugal. Prom tlie Avork of Moiiiz da Maia {2o) p 
aiipears that the rot of citrus fruit in Portugal is due to a Phytoph- 
V.iora (not identified) i<lentical Avith the one liercin dt-scribed. Mon;/, 
da Main also considers that the orange <lisease known as ‘Cujuado” 
ill Spain is due to his Phytophthora tliough jireviously attributed 
to Pythacystis ritrophthora on symptomatic e\ndence only. This 
may also ajiiily to the Italian citrus disease. iMoni/ <la Main also 
considers that this Phytophthora is probably indigenous to Me<liter- 
raniaii countries. As Australia has long been an imjxirter of lemon;> 
