My raspberries plants are very sick. How do I diagnose raspberry diseases?
My raspberries plants are very sick. How do I diagnose raspberry diseases? The leaves on my raspberries are curling up and brown.
The fruit wilts before it ripens. What to do? Asked by nancyaddis 53 months ago Similar questions: raspberries plants sick diagnose raspberry diseases Science > Agriculture.
Similar questions: raspberries plants sick diagnose raspberry diseases.
Likely it’s Raspberry Anthracnose, a fungus. Prune, practice good horticulture for prevention, and use fungicide spray. It is probably Raspberry Anthracnose, a fungus common to brambles.
The tell-tale signs are the curling leaves and the stunted fruit. While not hard to control, it must be controlled or you might lose your entire crop. Remove all the infected or stunted canes after fruiting/harvesting.
Dispose of immediately (it’s a fungus, so you don’t want the canes hanging around to infect the healthy ones). Prevention is a key here. Make sure you have good stock and it is planted in a sunny, dry area (fungus doesn’t like sun or dryness).
In early spring, cut off the old canes to almost ground level. Fertilize, but don’t over-fertilize. Prune and thin after harvest (about 4-6 inches apart).
Weed frequently to keep the rows about 12-18 inches apart to encourage air circulation and sun. And keep insects managed to keep plants from being stressed (but do so organically, this is a food crop! ).
Contact your local agricultural extension agent for recommendations on a fungicide and a spray schedule for your area. Sources: http://ipm.uiuc.edu/diseases/series700/rpd700/index.html .
Here's a Differential Diagnosis: RUST ON LEAVES(Occurs occasionally)Orange colored lesions appear on either side of leaf surfaces. Photo by Plant Disease Clinic YELLOW & GREEN MOTTLED LEAVES(Occurs occasionally)Yellow & green mosaic, ring spot, or line patterns on leaves. Leaves may be stunted, curled, or distorted.
Photo by Plant Disease Clinic CIRCULAR LEAF SPOTS(Occurs frequently)White, gray, or tan ciruclar leaf spots. Photo by Chad Behrendt OTHER CAUSESOther symptoms caused by chemical, animal, or environmental factors. Photo by Chad Behrendt Note: Leaf and stem symptoms are more useful in diagnosing raspberry diseases, as there are many causes producing similar symptoms on fruit.
GRAY GROWTH ON BERRIES(Occurs frequently)Berries turn brown and are covered with velvety, gray fungal growth. Photo by Plant Disease Clinic UNEVEN RIPENING OF BERRIES(Occurs frequently)Berries are small, dry, seedy, and ripen unevenly causing a pitted appearance. Photo by Plant Disease Clinic OTHER CAUSESOther symptoms caused by chemical, animal, or environmental factors.
Sources: http://www.extension.umn.edu/projects/yardandgarden/diagnostics/raspberry-c.html .
OR agsyst.wsu.edu/RaspberryReport2004.pdf regarding possible root rot. Here I'm quoting from the first webpage I listed from Haynes Nursery (in Southern Australia):PESTS AND DISEASES A fungal disease Phytophthera fragraria var. Rubi has been identified in some raspberries in recent years.It is now recommended that raspberries be planted on raised beds to prevent root systems from becoming water logged.
Great efforts have been taken to eliminate this disease, but unfortunately it continues to breakout from time to time. One of the main problems that effect raspberries are fungal diseases. Spraying with copper oxychloride in July before the buds burst will help stem some of the problems.
Raspberries are also prone to attacks from Thrips, Aphids and Two Spotted Mites all of which can be treated by either Malathion or Rogor(only spray if pest is present) At the time of flowering it is important to spray the canes with Rovral or Euparen for Botrytis (grey mould). You will need to continue this treatment every 7-10 days until harvesting time Raspberries are also susceptible to numerous viral diseases. Once infected, plants can't be cured.
Viruses are commonly spread by aphids, nematodes or infected pollen. To prevent the spread of viruses, destroy all infected plants. Then the 'agsyst' website is from Washington State University and is regarding root rot.
I sure hope one of these helps you! Good luck. Sources: http://www.heyne.com.au/gardencentre/factsheets/factsheet.php/Raspberries.htm .
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