Hi all, I planted a vineyard last year in Morgan Hill CA. The grapes are cabernet and they are planted in heavy black Clay soil. The soil was not amended. There is a crimson clover cover crop. My squash plants had mosaic virus last year and I am wondering if this may be the cause of the problem my grapes are experiencing. There were numerous cucumber beetles in the vineyard last year. Has anyone heard of bratislava mosaic virus? The vines had bud break about 2 weeks ago. The leaves are curling upward and look like they are burned on the edges. It progresses from there to complete deadening of the leaf. This is constant throughout the vineyard. There are 1,000 plants. Also, the larger leaves have some discoloration or transparency as you will see in the pictures. There is slight gall of the larger leaves with the discoloration. Thanks for your help.
Sesan, UC DAVIS is the Home of the Master Gardener program in Calif. and there is probably a branch in San Jose or near-by, just take a good sized sample to them on one of there clinic days or take it to your local County Extension Agent. They should be able to get you the help you need. BTW is Irv Perch's "Flying Lady Ranch" still serving those elegant, family style Italian dinners, and showing the old time cars, busses, planes, the original "Flying Lady" stunt plane, and such? barb
Barb, Thanks for your response. I will be sure to send a sample to the UC Davis extension. Morgan Hill has a dept. of ag office that sends weekly samples to Sacramento. Last year I used them a couple times. The results came back as "no pathogens". No other information was given. I have never used the Davis ext. before. It is good to know they are there as a resource also. Hopefully I can get more info and advice from them before I have to spend more $ for a private lab. As for the Flying Lady, they closed in 1994. I think some of the airplanes are housed at a Museum in San Martin. Thanks again, Sesen
I would contact the UC Davis viticulture department or possibly a extension specialist dealing in viticulture. It sounds like you have a pretty serious problem that needs to be looked at. VIRUS AND VIRUSLIKE DISEASES (Also mycoplasmalike organism [MLO]) Alfalfa mosaic Alfalfa mosaic virus Arabis mosaic* Arabis mosaic virus Artichoke Italian latent* Artichoke Italian latent virus Asteroid mosaic Undetermined, viruslike Bois noir (black wood disease)* MLO Bratislava mosaic* Bratislava mosaic virus Broad bean wilt* Broad bean wilt virus Corky bark Undetermined, viruslike Enation Undetermined, viruslike Fanleaf degeneration (infectious degeneration and decline) Grapevine fanleaf virus Flavescence dorée* MLO Fleck (Marbrure) Undetermined, viruslike Grapevine Bulgarian latent Grapevine Bulgarian latent virus Grapevine chrome mosaic* Grapevine chrome mosaic virus Grapevine yellows MLO Leafroll Closterovirus-associated Peach rosette mosaic virus decline Peach rosette mosaic virus Petunia asteroid mosaic* Petunia asteroid mosaic virus Raspberry ringspot* Raspberry ringspot virus Rupestris stem pitting Undetermined, viruslike Shoot necrosis* Undetermined, viruslike Sowbane mosaic* Sowbane mosaic virus Strawberry latent ringspot* Strawberry latent ringspot virus Tobacco mosaic Tobacco mosaic virus Tobacco necrosis* Tobacco necrosis virus Tobacco ringspot virus decline Tobacco ringspot virus Tomato black ring Tomato black ring virus Tomato ringspot virus decline Tomato ringspot virus Vein mosaic Undetermined, viruslike Yellow speckle Viroid * Indicates the disease is not known in North America Hope this helps and good luck.
So did you get an answer? I have the same problem this year with my Inverness table grape and no ag resources withint 300 miles CajunLou
I did some research of my own. I believe I have a couple of problems. first-I have spider mites. I took samples down to the UC Davis ext. and we looked under a microscope. If you are far from any services it might be a good idea to get a microscope. You can get them used on craigslist and universities sometimes sell them-or maybe your local high school should have something powerful enough. I found thrips and saw spider mites. Look up spider mite damage and you will see the similarity in my grapes symptoms. There are 3 types of mites. Pacific, williamette and two spotted. I have a lot of ladybugs which are predators of these mites, I know I have the pacific spider mites. I have also cut back on the dusty conditions by mowing and pruning. Also, spider mites thrive under conditions of water stress. So I increase the watering. My vines are thriving now. Secondly, I believe I had some roundup, or glyphosphate damage to the stems. The leaves growing off the wood were distorted and also were growing too many leaves. This is typical of roundup damage. The surrounding new growth-not on the woody section is growing fine. I cut off the wood stem and the vines are doing fine. I will be more careful next year about roundup getting on the vines. Good luck. Let me know how it goes. Tracy
Thank you for responding. We are certainly not without water this week! Flooding everywhere you look. But I will be very consistent with water. Also, I have arranged the Boy Scouts to weed thoroughly in and around the arbor on Saturday.
