Hi Jenny,<\/p>\n
The client came in today with these \u00a0raspberries in a community garden. \u00a0No major changes other than \u00a0moving them from a wetter part of the garden to a drier part a few years ago. \u00a0She said the plants that showing symptoms were new last spring \u00a0from someone\u2019s garden and had a bit of discoloration on some of then last summer and only in the row of the new plants. This year more plants \u00a0and in different rows are showing leaf discoloration.<\/p>\n
They were all pruned back to 3\u2019 in late Dec\/eary Jan and the used stalks removed.<\/p>\n
Fertilized with fish emulsion and a balanced all purpose fertilizer( organic) in March.<\/p>\n
Of the plant in the row exihibiting these symptoms, it is not every cane, just some within the plant while the pattern is all over the cane – top to bottom.<\/p>\n
It looks like too much and to many for a or a nutrient deficiency to me. I realize in writing this, I did not ask the soil ph question. I will get that from her.<\/p>\n
I need your opinion before saying take them all out and you might have \u00a0virus.<\/p>\n
I read the pnw :\u00a0http:\/\/pnwhandbooks.org\/plantdisease\/raspberry-rubus-spp-viruses<\/a><\/p>\n and ucdavis: \u00a0http:\/\/www.ipm.ucdavis.edu\/PMG\/GARDEN\/FRUIT\/DISEASE\/visusdiseases.html<\/a><\/p>\n http:\/\/www.ipm.ucdavis.edu\/PMG\/R\/D-CB-RBDV-FO.001.html<\/a><\/p>\n Thanks for your time and ideas on this one.<\/p>\n <\/p>\n here is the response from Mt Vernon:<\/u><\/strong><\/em><\/p>\n RBDV is pretty common and another reason why a lot of commercial growers remove plantings after 3-4 years, particularly in IQF situations because crumbly fruit cannot be processed in this manner.\u00a0 If you just want to process them, I don\u2019t see a big issue with the plants at present.\u00a0 However, stunting and yield reductions can also occur, which may justify replanting.\u00a0 Plus, the pollen is infected and removing the planting will minimize further spread.\u00a0 Some varieties with demonstrated resistance to RBDV include \u2018Cascade Dawn\u2019, \u2018Willamette\u2019, \u2018Chilotin\u2019, \u2018Boyne\u2019, \u2018Latham\u2019, \u2018Cascade Gold\u2019, and \u2018Nootka\u2019.\u00a0 \u2018Wakefield\u2019 appears slow to develop RBDV.<\/p>\n Unless you plant with a resistant variety, RBDV will likely reappear within 3-5 years.<\/p>\n <\/p>\n <\/p>\n here is the response from Jenny:<\/u><\/strong><\/em><\/p>\n Good morning.\u00a0 Finally getting to emails!!\u00a0 \u00a0\u00a0I had a similar sample in 2013\u2014bright yellow leaves that turned out to be a response to raspberry bushy dwarf virus (RBDV) or a complex of viruses, which is a common issue found in the PNW particularly as you move north.\u00a0 If you want to have the sample tested for a confirmation of this diagnosis, I could probably arrange for it at the USDA Small Fruits Virology testing lab).\u00a0 Send a few random yellow shoots from the two rows that are showing the symptoms.\u00a0 \u00a0See the sections in\u00a0http:\/\/pnwhandbooks.org\/plantdisease\/blackberry-rubus-spp-virus-diseases<\/a><\/p>\n <\/p>\n The main issue with RBDV is that the fruit is crumbly-so no good for the prime markets of individually quick frozen (IQF) fruit:\u00a0http:\/\/pnwhandbooks.org\/plantdisease\/raspberry-rubus-spp-crumbly-fruit<\/a>\u00a0but jams\/pies can still be made from the fruit.<\/p>\n <\/p>\n No cures exist for virus diseases in plants\u2014RBDV is pollenborne so new plantings in this area have the potential to become infected from whatever the source of the current infection.\u00a0\u00a0 Some cultivars show more pronounced symptoms that others.\u00a0\u00a0\u00a0 So that may account for the pattern in the planting if the rows are different cultivars of raspberry.\u00a0 The other viruses often found in association with RBDV are aphid-vectored.\u00a0 So again movement from one plant to another is quite common.<\/p>\n <\/p>\n If nutritional (which I am not suspecting given the fairly good size to the growth), it would be much more likely to be a deficiency than an excess.\u00a0 Sometimes giving the plant a complete foliar fertilizer can alleviate symptoms for this type of problem-but that still leaves you with determining \u00a0the problem of why it happened in the first place.<\/p>\n <\/p>\n
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