Speaker 1: Simulated drift on peaches this year, and each year we do it on a slightly different set of crops. In the past we’ve done it on row crops, this year we’re doing it on tree crops. We’re spraying herbicides that represent drift rates of various materials onto trees. Part of this is just to gain more knowledge of what the symptoms might look like on trees, or on vines, or whatever we’re spraying it on that particular year.
I picked trees this year because we have a lot of peaches up in the northern California area. These trees are going to be pulled out anyway at the end of the year, so there is no problem whether we injure them in anyway.
We picked the herbicides that would typically be potentially drifting onto the various tree crops. The Roundup, 2, 4-D, the Goal, the Paraquat that would potentially show symptoms, the Grandstand, these are either herbicides used in row crops or used in rice or sometimes used in trees and drifting right on to the threes themselves.
This here is the symptoms of Rely, glyphosate is the active ingredient in Rely, Rely 200, not 2,000, but 200. This is a fairly new herbicide, very effective on some of our Roundup resistant weeds, which makes it kind of an important herbicide particularly in tree and vine crops. You can see from the spots that are associated with these leafs, these are the symptoms associated with Rely. It definitely causes injuries similar to other contact herbicides where you get the spotting and then necrosis in the middle of the spot. If you didn’t come out here at this time you might think shot hole or some disease, but the shot hole the symptoms go all the way through as opposed to here we’ve got a, almost looks like a bulls eye associated with these particular symptoms as opposed to the disease shot hole.
Here we have Gramoxone, and Gramoxone, or Paraquat, is the herbicide here. This is definitely a contact herbicide. It is registered for trees and vine crops, and generally they tell ya right on the label, ” do not get this on your foliage or your trees,” because it will cause damage. Carolynn and I, this spring, say an almond orchard where the whole bottom was sprayed.
This again a drift rate, this is a lower rate than would typically be used. You can see the spots very similar to what we saw on the Rely plots where the spots have kind of a necrotic or dead spot in the center and kind of a little spiral around the outside. When you get a lot of spots together they kind of coalesce and form a spot like this.
You can tell this is a contact herbicide because if it wasn’t hit, the leaves weren’t hit, there’s no damage. It’s only in the areas where it actually contacted the branches, there’s no movement of this herbicide from the treated leaves into the non-treated portion of the plant. The parts that are back here, which were not treated, show no symptoms at all.
The symptoms, as I say, are typically the spots likes this, and each spot indicates probably one droplet that landed on that and caused these types of symptoms. These were just put on 6 days ago. These symptoms are showing fairly well. Only this single limb was treated so this is why the symptoms are concentrated in this particular area.
This is Shark. This is an herbicide that’s recently been registered in California [inaudible 00:03:30]. Unlike the other two that I showed you where we didn’t see very much symptoms on the fruit itself, you can see not only does it cause spotting of the leaves, but look at what happens to the fruit itself in terms of the spotting onto the fruit.
This one is a an herbicide, very potent, very effective on weeds, but also there is a great potential for injury to many crop plants, not just peaches here, but almonds and other crops as well. Not only to the leaves but to the fruit itself. Again, it doesn’t move within the plant, it’s a contact herbicide, so you are limiting you injury just to the treated tissue.
Speaker 2: What’s the …