grapevine leaf roll

I'm nearly certain that the 10 new Cabernet Sauvignon vines I planted this spring are infected with grapevine leafroll virus (GLV). By mid-summer the leaves started to exhibit the classic inter-veinal reddening and downard rolling of leaf margins. From what little I've read, it seems that the virus is typically propagated through cuttings and secondary vectors not spread from plant to plant by contact or seed.

Anyone have experience with this? I purchased these vines from Double A vineyards in NY. Should I ask for replacement vines?

RD

Reply to
RD
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Reply to
Pino

Joe,

These vines were just planted this year so no fruit.

RD

Reply to
RD

Do you have dry soil??? Did the plants get plenty of water or did you try and make the vines suffer?

Bob

RD wrote:

Reply to
doublesb

There is no need to make vines suffer the first year they are planted. They need strong root growth at this point. Plenty of rain here this summer but the vines were watered during dry spells.

Reply to
RD

"Vine symptoms are not a reliable indicator of the presence of leafroll virus because other factors may lead to similar symptoms"

This quote is from

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Bob

RD wrote:

Reply to
doublesb

"Leafroll causes a degeneration of phloem tissue in young shoots, leaves, petioles and rachis. Symptoms similar to that of leafroll can be brought about by actions that damaged the phloem, for example mechanical damage to the trunk, breaking of shoots, poor graft unions, girdling and the pinching effect of ropes. Low temperatures, as well as leafhoppers, may cause discoloration, which can be confused with leafroll. All red discoloration of vineyards should therefore not inadvertently be attributed to leafroll."

Bob

snipped-for-privacy@hotmail.com wrote:

Reply to
doublesb

And so where are you growing the vines - New York? Isn't Cab normally considered to like warmer climates, and are you therefore getting low temperatures (or at least the grapevines think so) now?

Rob

Reply to
Rob

Growing in SE Pennsylvania. Cab does grow here successfully at several local wineries. We have hot summers - it's the potential winter kill that could be a problem.

I appreciate that other causes could produce similar symptoms to those of Leaf roll but I believe I have eliminated most. This article from the WSU extension is very helpful with good pictures for anyone interested.

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RD

Reply to
RD

The only ways to know for sure if you have a plant virus are to send a sample to a lab or buy a test kit for the suspected virus.

Here's a lab that offers several test kits for GLF so you could call them for advice. Since the kits can be somewhat expensive, you may want to ask them if they know someone who might sell a test strip of two from their kit or a distributor that might sell in small quantities. We get other products from a distributor here in Colorado that also sells the Agdia virus test kits (mostly for greenhouse crops) and he may be someone to contact. Let me know if you want his name and number.

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Reply to
miker

Better yet, Penn State probably has a plant diagnostic lab that could help you. Check with your county extension office before trying the private lab I suggested.

Reply to
miker

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