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Raspberry Cane Spot



P_raspcnspot

Raspberry Cane Spot

Usually appear in

Spring to Summer


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Caused By:-     The Fungus ElsinoĆ« veneta

Description

Raspberry Cane Spot is caused by the fungus Elsinoƫ veneta which also affects Loganberry and Blackberry fruits. The symptoms are small purple spots that appear on the canes in May or June and gradually increase in size to form cankers which look like shallow white pits with a purple edge. Symptoms may occur on all aerial parts of the plant but are most noticeable on the canes. Numerous spots can weaken and may even kill the canes.
The fungus overwinters as mycelium in affected canes and produces spores which can be wind blown or water splashed to infect new plants.
Infected fruit matures slowly. It is smaller than healthy fruit and appears distorted, dry, brown and pitted or seedy.
Picture by Charles Drake, Virginia Polytechnic Institute and State University, Bugwood.org.


Control

Once spotted cut out and burn any affected canes. Cut back to below soil level and disinfect the secateurs between cuts.
Spraying with a copper-based fungicide may help prevent Raspberry Cane spot and also other diseases diseases, but you need to start spraying in March when the buds are about 1cm long and repeat as recommended.
Avoid unnecessary damage to the canes especially near the soil.
Poor soils and conditions especially waterlogging, weaken the plants and make them more susceptible to attack. Therefore mulch plants during the winter dormant period.
Ensure that they are well spaced so that air circulates and the canes dry out quickly after rain or heavy dew.
Raspberries will pick up diseases and viruses over the years which gradually reduce their productivity. Therefore it might be sensible to replace the plants with new stock every five to seven years.
Some varieties of raspberries show resistance to this disease.

P_raspcnspot P_raspcnspot[2]

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