Australia

Wheat leaf rust (brown rust)

Puccinia triticina

Leaf rust is caused by P. triticina, a basidiomycete belonging to the uredinales. It is a macrocyclic, heteroecious fungus, with five distinct spore stages. Like most rust fungi it requires two taxonomically diverse hosts to complete its life cycle.

The disease is recognized by yellowish-brown to cinnamon-brown pustules scattered on the upper leaf surface. Small secondary pustules may develop in circles around older pustules on susceptible host cultivars. A halo of pale green or yellow appears around the pustules when host resistance is incomplete. It occurs mainly on the leaf blades, although leaf sheaths can also be infected under favorable conditions, high inoculum densities, and extremely susceptible cultivars. When the temperature increases, some pustules turn black due to the production of teliospores. Telia remain covered by the host epidermis and are blackish-brown in color. On the alternate host plant plants e.g. meadow rue (Thalictrum spp.speciosissimum) the pycnia are clustered in small groups on slightly swollen yellowish to reddish-brown areas on the upper leaf surface. Aecia are usually in clusters on gall-like areas on the abaxial surface of the leaf.

Aerial dispersal occurs as urediniospores are passively released from uredinia on wheat leaves. The urediniospores become airborne and may be transported up to several hundred kilometres in an air mass before being deposited by gravity or washed out of the atmosphere by rain. Infections may also occur from urediniospores that survive between wheat crops or during the dormancy stage of winter wheat on volunteer wheat or native grasses. Urediniospores are spread from these areas by wind to cause annual recurrence of the disease in areas a few hundred kilometres away.

Pesticides
Amistar Xtra
intensity: ★★★
Arysta LifeScience Tebcon 430 SC
intensity: ★★★
Bumper 625 EC
intensity: ★★★
Cogito
intensity: ★★★
Custodia 320 SC
intensity: ★★★
Detour 250 EC
intensity: ★★★
FMC Propiconazole 250
intensity: ★★★
FMC Propiconazole 550
intensity: ★★★
Jubilee 500
intensity: ★★★
Jubilee Loaded
intensity: ★★★
Launch
intensity: ★★★
Opera
intensity: ★★★
Opus 125
intensity: ★★★
Orius 430 SC
intensity: ★★★
Ospray Triadimefon 500WG
intensity: ★★★
Propeller 250
intensity: ★★★
PropiMax
intensity: ★★★
Prosaro 420 SC
intensity: ★★★
Radial
intensity: ★★★
Rotam Proten 250 EC
intensity: ★★★
Rotam Toledo 430SC
intensity: ★★★
Soprano
intensity: ★★★
Tebby 430
intensity: ★★★
Tilt 250 EC Systemic
intensity: ★★★
Tilt Xtra
intensity: ★★★
Veritas
intensity: ★★★
Zolo 430 SC
intensity: ★★★
Arysta LifeScience Procon 250 EC
intensity: N/A
Bayonet
intensity: N/A
Emperor
intensity: N/A
Epoxicon 125 SC
intensity: N/A
Epoxiguard 125
intensity: N/A
Flufol
intensity: N/A
Intake
intensity: N/A
Intake Hiload Gold
intensity: N/A
Intake Pro
intensity: N/A
Laguna 430
intensity: N/A
Laguna Xtreme 800 WG
intensity: N/A
Mancoflo
intensity: N/A
Maxiflo
intensity: N/A
Overture
intensity: N/A
Prestige 250
intensity: N/A
Prop 500
intensity: N/A
Propicon 250 EC
intensity: N/A
Propicon 550 EC
intensity: N/A
Propicure
intensity: N/A
Quantum Pro Seed Treatment
intensity: N/A
Quantum Seed Treatment
intensity: N/A
Slipstream 250EC
intensity: N/A
Stingray 430
intensity: N/A
Tebucon 430 SC
intensity: N/A
Tyrant 500
intensity: N/A