A midsummer fertilizer application will also benefit these vigorous plants. These diseases are most common in plants that are stressed, so improving their overall health is the key to decreasing the chances of infection. Several leaf spot diseases can cause small red or brown … Any ideas of what it is, and whether it's fatal? I didn't have much hope that it would survive, so I was very surprised to see shoots peeking out of the leaves in March! When things cool off and the rains start up in the fall it will come back. Initially, the disease is seen as wilting leaves and large, lesions on the stems which enlarge rapidly and turn black. 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Pests are usually not a problem on rhubarb in the home garden. Frost Damage. Searching these forums, I found sunscald as a potential issue. 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Yes, that is correct. Also, if your rhubarb has brown spots, the culprit may just be a healthy growing rhubarb. It does have a few purpleish spots on the leaves, but they don't grow into holes or sunken lesions like I've read about leaf spot diseases on rhubarb. We just thought the leaves/stalks would get bigger, and then they started dying off. Rhubarb needs a spacious cool moist rich root run and does not mind dappled shade. Leaf injury would appear as brown or black discoloration along the margins. It could also be too much sun. Never harvest more than one-third to one-half of the plant�s stalks, in order to preserve enough foliage to sustain the crown. This is what mine looked like in June. If in doubt about the safety of eating the stalks, don�t. We're in the upper 90's and it's not even August yet. Getting the best from rhubarb . Press the soil firmly around the roots and water well. In order for the plant to become well established, leafstalks should NOT be harvested the first year and only a few the second year. Symptoms include plants that fail to leaf out in the spring, or they may leaf out only to die abruptly. The stalks may become twisted and eventually collapse. The stalks are most flavorful when fairly young, so harvest them soon after the leaf expands. One lilac also has some peculiar curled pattern in the leaves which I believe came from when my husband sprayed with weed killer nearby (a no no I scolded him for) and it Got onto that Bush. As with the previous pathogens, good sanitation practices go a long way to controlling the disease. A very similar fungal disease affects azaleas. Mine grows in heavy clay where there used to be a ditch. There are a couple of diseases common to rhubarb, which may result in spots on rhubarb leaves. It primarily stays indoors by a East facing window. It will die down in late October. What did you do with the pots for the winter? If rhubarb is hit by a hard frost or freeze in late spring, it still can be eaten provided the stalks are firm and upright. Let’s dive in. We've tried removing some of the outside leaves to expose the stalks to more light, but it has made no difference. Another website suggested verticilium wilt, but didn't provide any pictures. We had a couple storms the last few weeks with heavy rain and ive been gone so haven’t been out there as much. But this year I've been careful to keep them watered and I've fertilized with fish emulsion several times over the past 2-3 months. The two most common diseases seen in rhubarb that result in spotted foliage are Ascochyta rei and Ramularia rei. The garden gets full sunlight and is sheltered. The leaves may be getting wet as we water the plants. http://i21.photobucket.com/albums/b269/smarteze/IMG_0132.jpghttp://i21.photobucket.com/albums/b269/smarteze/IMG_0133.jpghttp://i21.photobucket.com/albums/b269/smarteze/IMG_0134.jpghttp://i21.photobucket.com/albums/b269/smarteze/IMG_0135.jpghttp://i21.photobucket.com/albums/b269/smarteze/IMG_0136.jpg. The leaves on our two-year-old rhubarb plant have gradually been turning brown around the edges and dying. That said, rhubarb is prone to spots on its leaves. Fungicides have not been found to be effective in eliminating the problem. LILAC HELP- Browning leaves, falling off, wilting branches, Peperomia Obtusifolia Variegata leaves turning brown and dropping, Calamondin yellowing leaves and brown edges. So when holes appear in the leaves it may cause you to worry. I put the pot in a somewhat protected corner of the yard and covered it with a ton of leaves last fall. Keep the area around the plants weed and debris free and remove and destroy any leaves that appear diseased. Rhubarb needs to be divided every so often; 10 years is the maximum amount of time a rhubarb patch should go undivided. So in this article, I’ll show you the most common causes, how to identify the problem, and what you can do about it. What recommendations do you have? Remove one-half of the mulch before growth starts in the spring. The best control is prevention, by planting purchased rhubarb crowns, rather than getting starts from a neighbor, and planting in well-drained soil. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Also, fertilize the plant as soon as growth appears the next spring and then again as soon as stalk harvest is over. If rhubarb is hit by a hard frost or freeze in late spring, it … {{gwi:26989}}It looks just the same now and we could still be picking if we weren't overrun with other fruit now. Both Ascochyta and Ramulari fungi spread by infected rootstock. Cut the damaged stalks off and compost them. Sign up for our newsletter. Another disease that may cause spotting is anthracnose stalk rot. Rhubarb crown rot is caused by Phytophthora species fungi. Select certified healthy rhubarb and plant in sunny, well-draining, fertile soil. I hope this helps. I am so worried I’ll lose both bushes and they are beautiful girls I love dearly and I want to make sure I treat them properly. Sign up to get all the latest gardening tips! Cover the crowns with no more than an inch or two of soil. For each plant, prepare the soil by adding 3 to 4 inches of compost or well-aged manure and a handful of fertilizer that is relatively high in phosphorus and potassium, such as 5-10-10. I have taken it outside for a few hours at a time but for the most part it stays inside since it’s pretty windy on our balcony. Loosen the soil to a depth of 10 inches. The spores also remain in any debris left from season to season. One is fine, but the other had leaves that were turning red, and it was dying. Upon digging the plants up, the roots and crowns are rotted. I added a small amount of citrus fertilizer about 3 months ago. I'm glad you posted about this cause I've got two 3-year old plants that look pretty ratty, in a similar way to yours. Rhubarb can also be planted in the fall after dormancy has set in. It is not very serious - more of a cosmetic issue than anything else - and most easily addressed by just clipping off and destroying the affected tissue, usually just the newest growth. I water it 2x a week. Yes, it needs cool moist conditions to really flourish. Fresh rhubarb can be stored for two to four weeks at 32-36 degrees F and 95% relative humidity. What causes rhubarb rust spots and what can be done for rhubarb that has brown spots? Allow new stalks to develop for eating. Funally found a spot it does grow well in but like earlier responders, mine also dries up pretty much in the heat of summer but does well again the next spring. Flower stalks should be removed as they appear, as they deplete reserves from the crown that supports vegetative growth. It can take the cold but not the dry heat we get in my area... still, it will grow here! Client stopped in with rhubarb leaves. Curly dock is an alternate host for this insect, so dock plants nearby should be removed. But if you find your cucumber leaves turning brown it’s a clear sign that your plant has a problem that may affect further growth and fruit yield. 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