Later today, I’m giving a brief presentation and report at one of our groves on Early Pride dieback. We’re using two documents: 1) a pamphlet going over our experience in managing the problem, and 2) a paper co-authored with USDA on Early Pride. Here’s the link to both documents.
One of the symptoms we see in citrus greening disease is the rotting of fruit on the tree. In this example, an orange has died, dried out, and has become infected by what is probably a fungus. This fruit will soon fall from the tree.
• Aperture:ƒ/2.2• Camera:iPhone 6 Plus• Taken:November 29, 2016• Focal length:4.15mm• ISO:32• Shutter speed:1/1199s
One thing we’ve noticed in our area Florida is that some grapefruit groves seem to do well, even in the shadow of citrus greening disease. Many of our young grapefruit trees look green and healthy. We’d like to see more production, and hopefully that will come soon. The photo shows healthy-looking trees in the Lakeland area. If you get closer, you do notice a few minor signs of disease in the leaves here and there. But overall, you’d have to say this grove looks pretty good. Time will tell, though, because we’ve seen anything can change on a dime with this disease.
Alturas, Florida, has been hit hard with citrus greening. Trees in groves continue to be removed at an increasing rate. This photo, next to one of our groves, shows the devastating result of this disease. At least the risk of transmission of disease to our grove is reduced once this grove is taken out.
Last week, we reached a milestone in our Tamarixia release program–200,000 wasps released! Tamarixia is a parasitic wasp species that attacks citrus psyllids, which transmit greening disease. We’re interested in establishing Tamarixia in our area to help cover the declining backyard citrus trees that are difficult to treat for psyllid control by other means. We keep track of our wasp releases using our own iPhone app we developed (Tamarixia Tracker) to GPS and photograph each release.
We participate with the State of Florida in a program to release wasps that attack citrus psyllids, which transmit greening disease. Several months ago, I wrote an app to help us collect and organize the data. Well, this week, I’m happy to announce our wasp app, Tamarixia Tracker, is now in the Cloud! This cuts down on our administration time, and now we can report our wasp data back to the Dundee lab in real-time. Check out the video after the jump to see how it works!
Several days ago, we noticed that fruit and leaf drop are beginning again. From what I can gather, this might be some of the first of the season, at least in our area in Central Florida. This is the same sort of drop we’ve seen the past couple of years at about this same time. It’s hard to pin down a cause, but it seems the fruits and leaves most affected by this drop are affected with greening symptoms. Here’s a quick drive through video of several trees to give you a general idea what we’re seeing in the groves. The video is after the jump.
• Aperture:ƒ/1.8• Credit:Steven Rogers• Camera:DMC-LX7• Taken:October 1, 2014• Copyright:© 2014 Steven Rogers Photography All Rights Reserved• Focal length:4.7mm• ISO:80• Shutter speed:1/125s• Title:Lake Hancock Fruit Drop
We completed our Tamarixia work this week and we’re now at 177,400 wasps released! We’re pleased with the way this project is going.Our custom app, Tamarixia Tracker, helps us get the information back to the state quickly. In fact, we often have our report data tabulated and sent to the state within an hour or so of completing our release work. Here’s a sample report if you’re interested checking out our results. Download our Tamarixia Release Report.
WORKING DRAFT VERSION
In the first post in this series last week, I reported on some of our management success in controlling dieback in Early Pride citrus. I took a look at the symptoms of the problem and examined the progress of the disease over the course of a year in a new block we planted. Although I didn’t go into detail last week, I made the point that most of the dieback we saw was due to some sort of physical trauma. This week, I’ll take a detailed close-up look at those symptoms, and illustrate how I came to the trauma conclusion. In my next report due later this week, I’ll go over the findings of the USDA regarding secondary pathogens, and the treatment programs we used to help contain the problem in our grove.