Archive for July, 2014
Saving Our Grapes from Birds and Other Predators
Last year, as we approached harvest time, I was admiring our grapes one weekend day when I realized it was time to check the sugar levels. Unfortunately, I had left my refractometer in Fairfax, which, well, wasn’t very helpful. But not to worry. I made a mental note to bring it with me to Afton the following weekend, when I was sure that the sugar in the grapes would be just about perfect.
I remembered the refractometer, but unfortunately, I could not find the grapes. I searched the Petit Verdot rows, where I was sure I had seen small clusters hanging, and the Cab Franc rows, which I knew also had grapes hanging from the vines. But there were none to be seen.
It was kind of like the time my car was stolen at the train station in Jersey. I stared at the space where my car used to be wondering why it was no longer there, and then wandered around the parking lot as though I hoped it was magically somewhere else. Somewhere other than where I knew I had left it. Self-delusion is a terrible thing.
It was heartbreaking to see that the birds, bears or other predators had picked the vines clean.
My car was gone, all those years ago, and last year, so were my grapes. My first thought was birds. Yeah, they love grapes, and they know when they’re ripe. They descend upon the vineyard just at the time when the brix (a measure of the sugar level) is just right, and they steal everything in sight.
Of course, it could have been other predators. It seems that all of nature has its eyes on grapevines as the harvest season grows near, and so the vineyard manager needs to be alert. Raccoons love grapes, as do squirrels and bears and crows and turkeys. As it happened, our neighbors told us about a bear they had spotted wandering through our property last year, right around the time we found a huge gash in our deer fence. Jim Parkhurst of Virginia Tech told the summer technical meeting of the Virginia Vineyards Association that a bear will sit down in the vineyard, pull clusters of grapes off the vine, and then move down the row, sit again and pull off more clusters.
But, of course, it’s hard to know for sure which predator stole my grapes. Last year was a very difficult year because of the acorn shortage. There are two types of acorns; those that come in every other year and those that come in annually. In 2013, both types failed. So squirrels especially were desperate for a meal, and vineyards were like the free sample aisle at Costco. I talked to vineyard managers who reported losing more than a third of their grapes to predators last year, which is extraordinary.
So, this year, we’re all taking precautions.
This is more or less what the netting will look like once it’s dropped. Here’, I’ve just attached it to the first catch wire on the Viognier vines, and haven’t yet rolled it up.
I spent the day Sunday (after a full day Saturday working with the Vineyard Goddess on canopy management) installing bird netting. Bird netting places a barrier between the grapes and predators, and hopefully it will be enough to preserve this year’s crop. I got about half-way through the vineyard, hanging the netting on my Viognier and Petit Verdot, and then rolling it up so that it will be out of the way until it’s needed.
I should point out that I would have also gotten the netting up on my Petit Manseng except that the Vineyard Goddess had found – I can’t even bring myself to say this – a bird nest in those rows, and asked me to wait a week or two. I wanted to rip the nest out, but I couldn’t. She’s the Vineyard Goddess, after all, and she outranks me when we’re working among with the vines.
As it turned out, I wouldn’t have gotten that far anyhow. I ran out of clips before I was quite through the Merlot, and I ran out of energy before I got to the Cab Franc. So, I ordered more clips today from Spec Trellising, and I’ll be praying next weekend that I don’t run out of netting. The roll that they shipped is 1,650 feet long, which should give me a couple of feet to spare. But who knows.
Here’s what the netting looks like after it’s rolled up, waiting until the grapes are ripe enough to attract predators.
A couple of words of advice to the weekend vintner about installing bird netting. First, don’t expect instructions. Apparently the netting doesn’t come with any. And don’t expect advice on how to install it – I didn’t get much. Also, don’t think the Internet will be of any help. I googled side-netting, bird-betting and every conceivable permutation of those terms for hours and got no help whatsoever. I did find lots of helpful advice, videos included, on different kinds of netting, especially the stuff that hangs over the trellis, creating a ceiling of sorts that you can drive a tractor underneath. But nothing for my side netting.
As it turned out, though, much to my surprise, bird netting isn’t all that hard to install.
Once I got the netting into the vineyard, and looked at the net clips, I was able to figure out (after one false start) how to do it. The clips look like tiny boat anchors, with a hook at the top to hold it to a catch wire and one hook on each side at the bottom. What I finally realized is that the back hook holds the netting on the catch wire permanently, and the front hook holds the rolled up netting (the storage position) until it’s ready for use.
The hooks that hold the netting to the catch wire.
I have lots of other questions, but I’ll figure it out as I go. And I ordered one more piece of equipment – small “C” hooks, which will hold the netting together at both the top and bottom to keep birds from finding a way in. I also have a tagging gun which is supposed to be a good way to zip shut the net at the bottom, but truthfully, I couldn’t figure out how to make the gun work this weekend.
I’m feeling pretty good about the netting, though. Unlike last year, I think most of my grapes will make it through to harvest. And if they don’t, it will be for reasons other than birds and other predators.
And, this is my first real harvest. As upsetting as it was to see my grapes stolen by predators last year, the fact is, it wasn’t that much of a loss. We had dropped fruit during the year to give the two-year old vines a good start in life. We wanted their energy to go toward developing a strong trunk and root system, not grapes. So, for those of you wondering exactly how many grapes were stolen, the answer is something like a half-dozen or so clusters that we missed when dropping fruit.
Not the end of the world, thank God. More like a cheap lesson for the future.
How I Came to Love the Idea of Mechanization
Well, the good news is that we no longer need to hedge most of our grapevines. The bad news is that when we arrived at the vineyard two weeks ago, we found the upper third of the vines covered with Japanese Beetles who were partying as though the wine had already been made and they had just broken into the cellar. They were chowing down on the leaves, having sex, and in some cases, doing both at once. I almost hated to interrupt.
But, of course I did. More on that in a moment. But first, you may be wondering what that has to do with mechanization. So, let me explain. (This will take some time.)
Looking good: the vineyard in the weeks before the Japanese Beetles launched their assault (and before leaf pulling).
A week earlier, I had arrived home in Fairfax, exhausted and in pain, after a short overnight trip to the vineyard. I had made the trip strictly for the purpose of spraying, and I had no idea what I was in for.
With recent rains and warm weather, conditions in the vineyard were ripe for a bunch of fungal diseases, so spraying was a necessity. But the abundant rainfall we’ve received this year had also prompted amazing vine growth.
Stepping back for a moment, let me say that we had taken steps to control the vines’ vigor. Specifically, we had finished shoot thinning and done some leaf pulling a few weeks earlier (this takes us back to the first or second week of June).
Shoot thinning and leaf pulling are part of the process of maintaining balance in the vine. More on this in a future post, but for now, suffice it to say that shoot thinning and leaf pulling help open up the canopy for air flow and spray efficiency, among other things, and shoot thinning ensures that the crop load of grapes is optimal for the vine. That means that the clusters of grapes that remain on the vine get sufficient sugar from photosynthesis to make good wine.
Clusters of grapes beginning to take shape!
However, for all our work, it turned out that the vines still had many more shoots and many more leaves than they needed. And each leaf has to be covered, top and bottom, with fungicide. No exceptions!
In a commercial vineyard, we’d use an airblast sprayer that would spray a fine mist deep into the vine canopy, covering each leaf top and bottom as the tractor moved down the rows. Good canopy management helps, of course; spray efficiency is improved in a well-maintained canopy with properly separated shoots and an optimal number of leaves. But whatever else we might want to do, an airblast sprayer is clearly superior to what I’ve been using.
Uh, yeah. Clearly superior in the way that a Lexus is clearly superior to a bicycle as a mode of transportation.
What we had been using for the past two years were two-gallon, hand-pump sprayers. But I had moved on to a four gallon backpack sprayer that is continually pumped as I move through the vineyard. The sprayer weighs 43 pounds when full, and the pumping action has the effect of exerting even more weight on one shoulder.
Now, when I describe our little hobby vineyard to friends, the 225 vines we maintain seem pitifully – almost embarrassingly – small. But when I’m spraying, it seems huge – really, really, really huge.
On that particular weekend two weeks ago, I spent about five hours spraying some 20 gallons of chemicals. The backpack sprayer was heavy enough that the only way I could get it on was to sit on the ground with my back toward it, pull the straps around my shoulder, then turn to my side to get some leverage as I used my arms to push me to a standing position. That’s a technique I learned in the Army when we carried much heavier packs. But of course I was so much younger then.
The long and the short of it is that I wasn’t just exhausted when I finished, I was in considerable pain. The pack was heavy, it required constant pumping on one side which really hurt my shoulder. So, as I sprayed fungicide, I observed that a small number of Japanese Beetles were beginning to make themselves at home in our vineyard, but I was frankly too tired to care.
After I finished and cleaned up, I limped home, vowing that I would find a better way to handle the spraying.
The vines are okay, but it’s still heartbreaking to see this kind of damage. Zoom in, and you’ll see what I mean.
The following weekend, I came face to face with the consequences of my decision to avoid dealing with the Japanese Beetles. As I said earlier, our vines were covered with thousands of the little buggers, and the damage looked extensive. Many of the vines had lost all of the leaves at the top, while others appeared to be almost totally denuded.
So, we sprayed again. That weekend, the Vineyard Goddess was with me and she handled half the spraying. We were in a bit of a panic over the amount of damage, and so we immediately sprayed the vines with Sevin. Ordinarily, that would have been it, since the vines had received ample fungicide the previous weekend. But with all the rain from the past week, I wondered the next day if we should spray a fungicide. We assumed, however, that a second spray would wash off the Sevin, and we were more concerned at that point about the Japanese Beetles than the possibility of fungal diseases on vines that, honestly, seemed amazingly free of disease.
And need I say that a second spraying session that weekend would have involved some four to five man-hours of labor. Not that the labor had anything to do with my decision.
Which brings me back to my new-found love for the idea of mechanization. I would like to say “love of mechanization,” but I haven’t actually mechanized anything yet. It’s still in the idea stage. I’ve done a lot of research, though – enough to know that it probably won’t make economic sense to buy the airblast sprayer that I really want.
I suspect I’ll end up with a sprayer that will attach to a tractor and provide a long hose so that I can park at one end of a row and work my way through the vines holding nothing more than the sprayer nozzle and some part of the hose. I’ll use either my John Deere 2320 or, more likely a new 500 series John Deere tractor that is smaller, more maneuverable and more appropriate to the hobby vineyard we have. (But no, I’m not getting rid of the 2320 – the front-end loader by itself justifies the cost. At least that’s my story, and I’m sticking to it.)
In any event, I’ve fallen in love with the idea of mechanization. Before too many more weeks pass, I hope to make it a reality.
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