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
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.
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
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.
Early Pride is a relatively new licensed citrus variety that’s being planted more often in Florida. It’s popular as a fresh fruit because of its early season maturity, large fruit size, deep orange color and sweet flavor. If you’re thinking about working with Early Pride, there are some things you need to know about its tendency for dieback in leaves, twigs and shoots. From our recent experience, the dieback seems manageable, but there are some things you should do to treat and prevent it. I tracked the development, causes, treatment and recovery of dieback in one of our groves over a year from when the trees first went into the ground to determine what are the causes and treatments for Early Pride dieback. Almost all the trees eventually recovered by following the practices we worked out.
This is Part 1 of two posts on managing dieback in Early Pride citrus. This first post discusses symptoms and disease progress, and Part 2 will cover causes, treatment and recovery. This post will be updated as more information comes in. The last updates were on September 17, 2014.
• Aperture:ƒ/8• Credit:Steve Rogers• Camera:DMC-LX7• Taken:November 27, 2013• Copyright:© 2013 Steven Rogers Photography All Rights Reserved• Flash fired:yes• Focal length:4.7mm• ISO:100• Location:27° 56.251′ 0″ N 81° 53.307′ 0″ W• Shutter speed:1/80s• Title:Early Pride Dieback
Today, I had a chance to drive around the citrus groves in this area with some visitors from California. We talked about alternative crops, marketing, and variety licensing among other things. During the visit, we happened upon a section of one of the groves showing what I would call classic, textbooks symptoms of greening. Seeing the differences in the patterns in these symptoms can be subtle, but once you get accustomed to the general look, you begin to recognize them more easily. Here are eight examples we saw today.
Checking the groves for insect damage today, I see something I haven’t seen for several years. There’s a pest of citrus, called rust mites, that causes a brownish injury on the rind of the fruit. Normally, we’d start treating for this insect this week, but a very heavy rain yesterday literally washed the insect off the fruit. We got close to 4 inches of rain, and this will buy us 7 to 10 days before having to treat for this insect.
We recently planted our first ‘Early Pride’ trees in Polk County. Here are some of the various symptoms that appeared back in October 2013 on the trees soon after they were planted. We’re currently looking closer into the dieback issue to see if the various symptoms have similar or different causes.
(Click the images to view larger versions.)