Raspberry Spur Blight

Disease

Raspberry Spur Blight

Didymella applanata

fungi

In a Nutshell

    Blue or violet spots & spore blisters on the shootsBark bursts openEarly leaf drop

Hosts: %1$s

· Raspberry

Symptoms

Blue to violet spots appear on the shoots and the bark bursts open. Subsequently, the spore cushions form blisters on the shoots. The plant drops its leaves early in the year. In spring the affected shoots do not sprout.

Trigger

The pathogen enters the plant with humid spring weather and hibernates in the affected shoots.

Biological Control

Remove infected shoots. After an infection, use a plant fortifier, so the plants are able to fight the fungi. You can choose more resilient varieties, such as Glen Moy, Glen Rosa, Julia, Malling Admiral or Leo.

Chemical Control

Fungicides based on Lime Sulfur or Captan/Fenhexamid mixtures can be used.

Preventive Measures

    Balanced nutrition supply is importantInjuries should be avoidedLeave sufficient distance between plantsApply plant fortifier




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