Northwest berry Foundation

Management Detail

Cane and Leaf Rust

in Blackberries

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Latin name: Kuehneola uredinis

Description:

A pest in blackberries, especially in the Oregon Thornless Evergreen and Silvan blackberry cultivars. Hybrid berries are generally not affected by this disease. This fungus has several spore types that infect both floricane and primocane leaves. It is not systemic in the plant. Wet conditions favor disease development. Canes become brittle and break easily. Premature defoliation can occur if disease pressure is severe.

Links:

Scouting:

  • Rust diseases go through a number of different spore stages throughout the season; the first ones to become apparent in the season are elongated, yellow postules on the floricanes in late spring.
  • Watch for brittle canes with the characteristic yellow/orange postules throughout the season.
  • Can be confused with the much rarer and much more serious orange rust which is a brighter orange in color.

 
Cultural Controls:

  • An alternate-year fruiting program reduces disease pressure. However, production is dramatically reduced for many growers.

 

For information about chemical controls, check with our Pesticide Guide.

images


photo from Oregon State University


photo from Oregon State University

 


photo by T. Peerbolt

 


photo by T. Peerbolt


Cane and leaf rust in Marionberries - photo by T. Peerbolt


Cane and leaf rust in Marionberries - photo by T. Peerbolt


Cane and leaf rust in Marionberries - photo by T. Peerbolt

 

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