The cane is weak in the area of the crook and often breaks at this point during pruning and training. In most cases the cane recovers, although they remain slightly crooked. A few days later eggs hatch into very small larvae that spirally girdle the tips of the canes and cause wilting. These raspberries can be planted together, but may silently carry the virus into mixed beds with susceptible varieties since they rarely show mosaic symptoms.Beginning in April, female horntails insert their eggs just under the epidermis of both blackberry and raspberry canes, about 5cm (2in) below the tips. Red raspberries Canby, Reveille and Titan tend to be avoided by aphids, as does the purple-red Royalty. Once these pests are observed, immediately treat them using insecticidal soap or neem oil, spraying weekly until the aphids are gone, to slow the spread of raspberry mosaic virus.Ī few raspberries appear to be resistant or immune to the effects of the virus, including the purple and black raspberries Black Hawk, Bristol and New Logan. If any of the raspberries in your patch carry any virus in the raspberry mosaic complex, raspberry aphids may vector it to uninfected plants. Unfortunately, there’s no good way to prevent aphid pests, but careful monitoring will alert you to their presence. The raspberry mosaic complex is vectored by very large, green aphids known as raspberry aphids ( Amophorophora agathonica). As weather warms, mosaic symptoms in raspberries may disappear entirely, but this doesn’t mean the disease is gone – there is no cure for raspberry mosaic virus. Leaf symptoms vary from yellow mottling on developing leaves to puckering with large dark green blisters surrounded by yellow halos or yellow irregular flecks throughout leaves. Mosaic virus on raspberry usually causes a loss in vigor, reduced growth and a significant loss of fruit quality, with many fruits becoming crumbly as they mature. The raspberry mosaic complex includes many viruses, including Rubus yellow net, black raspberry necrosis, raspberry leaf mottle and raspberry leaf spot virus, which is why mosaic symptoms in raspberries can vary significantly. Raspberry mosaic virus is one of the most common and damaging diseases of raspberries, but it’s not caused by a single pathogen. Sometimes, though, growing lots of different berries can work against you, especially if you accidentally introduce raspberry mosaic virus into your garden. Raspberries can be fun to grow in the home garden and with so many luscious berries in easy reach, it’s easy to understand why gardeners often grow many varieties at once.
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January 2023
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