
TY  - JOUR
A1  - Edwards, J. 
A1  - Taylor, P. A. 
A1  - Parbery, D. G. 
A1  - Halloran, G. M. 
T1  - Peppermint rust in Victoria: the incidence&#8211;severity relationship and its implication for the development of an action threshold
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 1999
VL  - 51
IS  - 1
SP  - 91
EP  - 96
KW  - Mentha &#215; piperita, Puccinia menthae, mint rust, incidence, severity, propiconazole.
UR  - https://doi.org/10.1071/AR99012 
N2  - Todd's Mitcham peppermint is grown in north-eastern Victoria for essential oil production. Peppermint rust, caused by Puccinia menthae, reduces oil yields by up to 50&percnt;. Disease progress was monitored over 4 seasons (1994&#8211;98) on untreated peppermint and peppermint treated each season with propiconazole. The untreated peppermint died out within 4 years. A relationship between disease incidence and disease severity was found that could be described by the equation Y = 0.26 x 10 0.02X where Y is disease severity (&percnt;) and X is disease incidence (&percnt;), with a linear phase at levels of disease incidence <60&percnt;. The relationship was consistent for data from different seasons, two separate geographic regions of Victoria, and for pot- and field-grown peppermint. The use of the incidence&#8211;severity relationship to develop an action threshold for the initiation of fungicide treatments is discussed. 
ER  -

