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Messages - matt_citrus

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Citrus General Discussion / Re: Fungal disease on new flushes?
« on: May 23, 2022, 07:13:58 PM »
Coming back to this, I'm fairly certain now that it's Alternaria Brown Spot.

Don't have a good mechanism for control yet given how often it rains.

Citrus General Discussion / Re: Leaf Cupping & Magnesium Question
« on: November 29, 2021, 06:30:20 PM »
The downward cupping can sometimes mean overwatering (or vapor pressures inconsistent with plant moisture). Plant is trying to shed moisture.

Citrus General Discussion / Re: Indoor winter growroom
« on: November 07, 2021, 12:15:36 PM »
I'm "only" running ~17 true W/sq ft. Two sets of Kingbrite 650W LED light bar fixtures (10x LED light bars of LM301H + deep red/infrared). The mix tests at 3400K and 175 lumen/W (and ~1660 total PPF). The LED drivers are not 100% efficient; each fixture pulls closer to 750W from the wall to generate 650W LED output. Kingbrite was highly recommended by some of the other research forums.

The original Kingbrite mount was 100mm spacing between light bars. This would have created a more pronounced PPFD spike in the center. I remounted at ~300mm spacing to distribute the light over a substantially larger area and make the PPFD coverage more uniform.

Lumens or foot candles aren't a great measure of PPFD because it's spectrum dependent. But it's easier to measure the former. 1700 FC at the plant bases and 2700 FC a little over a foot below the lights. If it's close to sunlight spectrum, that's 350-540 PPFD.

Running 12hrs on/12 hrs off. Tops of plants are getting DLI in excess of 25, the bottoms are closer to 15. I planned for 21 for healthy growth.

VPD is averaging 0.9-1.0 with range of 0.6-1.2. Trying to keep humidity up to sustain beneficial mite populations.

Citrus General Discussion / Re: Help for 50 year old backyard lemon tree?
« on: November 06, 2021, 02:18:57 PM »
Underfertilized and possibly overwatered.

Citrus General Discussion / Re: Indoor winter growroom
« on: November 02, 2021, 10:46:17 PM »
Humidity and airflow - There's an HVAC vent into the room, and a door. The heater is running for the house more frequently now with the lower temperatures, so that's the positive pressure into the room. Between the vent and keeping the door almost all the way closed, the humidity has been in a good range. There are 30 citrus trees transpiring water vapor into the air! (and evaporation from the pots.) I also have a floor fan on a timer to turn on for 30 min every 2-3 hours for more circulation. It's a very relaxing - if bright - space to be in. Lots of blooming now, too.

Agree with all the comments here about the Root Maker pots, especially for up-potting. It's easy to cut the zipties and expand/add panels around the existing root ball. Combined with the 5-1-1 mix (I generally add more perlite to be closer to 5-1-2) it's a forgiving setup. You can get a feel for the watering by the weight of the pots,, and there's a clear relationship between canopy size, growth, and diameter of the pot for how frequently watering is required. Some of the smallest pots get water every day and they're growing like crazy (finger limes in particular). Tricky to think about up-potting again during constant flushes.

Brian, good question and something I stressed over in the months leading up to the transition. I ended up building a wood platform on casters, covered with panda film to catch any water (any sturdy plastic barrier will do). The trees sit on top of this. I also used some existing plastic catch basins on wheels as well for some trees. So, all the water is caught above the floor and I can maneuver around to get into the thick of the trees to sweep/vacuum as needed. Downside is losing 6-8" of allowed height but well worth avoiding water damage. Need to get the greenhouse planned :).

Thankfully, have not had to deal with any scale in the region. Lots of caterpillars and earwigs before they came in, and of course the big cicada emergence. The surprise pest was a single Boxwood Psyllid on the pomelo but that was months ago.

Citrus General Discussion / Indoor winter growroom
« on: October 30, 2021, 06:42:36 PM »
Brought the trees in about two weeks ago, just before the fall storms. Almost every tree is flushing now.

The lights are creating a 10°F temperature delta.

A few of the trees require almost daily watering. They may overtake the space within a couple months.

Citrus General Discussion / Re: Fungal disease on new flushes?
« on: October 19, 2021, 07:26:01 PM »
Does anyone have suggestions for treatment? New growth continues to be affected.

Citrus General Discussion / Re: Osmocote Plus is cheap on Amazon right now
« on: September 03, 2021, 09:26:51 PM »
Thanks Brian.

John B, that GroPower fertilizer is great for the regions that have it in stock.

Citrus General Discussion / Re: Fungal disease on new flushes?
« on: August 27, 2021, 10:14:55 PM »
It does not look like Alternaria Brown Spot.

The mystery continues then.

Citrus General Discussion / Re: Fungal disease on new flushes?
« on: August 24, 2021, 09:27:28 PM »
Perhaps have answered my own question but offer it to the experienced growers for confirmation.

Looks very much like the Alternaria Brown Spot symptoms on young growth in this recent research paper:
Alternaria brown spot on new clones of sweet orange and lemon in Italy

And in this UF publication: Alternaria Brown Spot

Citrus General Discussion / Fungal disease on new flushes?
« on: August 24, 2021, 07:23:05 PM »
30 or so trees in very close proximity and the only one experiencing this is a Shiranui. New growth flushes are browning and dying off. Is this one of the common fungal infections?


Anyone noticing heat/sun wilting sensitivity In the new growth? Seeing some leaf tip dieback in the hottest conditions.

Citrus Buy, Sell, & Trade / Re: Where to buy citrus online (USA)
« on: June 27, 2021, 12:00:31 PM »
Madison Citrus Nursery ( )

Citrus General Discussion / Scion or rootstock? (Baboon lemon)
« on: June 22, 2021, 05:28:19 PM »
Trying to determine if this low growth is scion (Baboon lemon) or rootstock (allegedly US-897).

US-897 should be easy to identify (trifoliate), so I am wondering if there's an interstock. The petiole wing of the low growth is much larger than the top growth.

Any ideas?

Low growth

Scion growth

Citrus General Discussion / Re: Endangered Bees
« on: April 17, 2021, 06:57:44 AM »

Agree with Millet. Looks like ACP on new growth.

Citrus General Discussion / Re: Tree Dieback??
« on: June 01, 2019, 12:29:30 PM »
Brian, how were you able to defeat the scale?

Really nice to see the growth over time. Can you share more detail about the sprinkler and irrigation setup, especially for the younger/newly planted trees?

Citrus General Discussion / Re: Pruning in ground citrus?
« on: June 19, 2018, 12:33:34 AM »
I have found this presentation on citrus pruning techniques to be informative, although I haven't cross-referenced with any academic papers:

Citrus General Discussion / Re: Help with my meyer lemon
« on: January 10, 2018, 01:19:19 AM »
Snek, the symptoms you describe here and in the other thread match my experience so far. Only affecting the Meyer lemon (and mine is in the ground on standard rootstock) and not spreading to any adjacent trees.

I did recently find a contact in the CDFA Plant Pathology office that offered to diagnose, so I'll probably send a cutting in soon and perhaps we can all resolve!

tl;dr: Reported suspected HLB in a stranger's front yard lemon tree in August. CDFA (a state agency) replies ask me (a private citizen) to arrange for samples with the unknown homeowner. How can we slow ACP/HLB if it takes half a year for a CDFA inspection?

Four months ago, I reported a lemon tree in Westchester, CA to the Asian Citrus Psylid / Huanglongbing (Citrus Greening) branch of the California Department of Food and Agriculture. The tree is infested with ACP and showing potential signs of citrus greening, but it's not in my yard -- it's in the non-fenced and non-gated front yard of a stranger's property, and I only see it when I walk our dog down a particular street (not on our usual route).

I recorded the address, and sent a note to the CDFA's Report A Pest email. I indicated the date, the suspected HLB, the address of the property (and that it was in the front yard), and that I did not know the landowner. To their credit, a response: "please send photos." It seemed that despite the report, no action would be taken without imagery. Nonetheless, a few weeks later I was again on that street, took a photo, and sent it in.

The response from CDFA (bolded emphasis is mine):
Our State Entomologist in Sacramento sent me the following information in response to the picture you submitted:

“It appears that the resident is correct—this does appear to be an infestation of Asian citrus psyllid.  It appears there is some asymmetrical yellow mottling of the leaves.  This is characteristic of what we are asking residents to look for HLB.  I recommend that we have someone collect a sample of symptomatic tissue and psyllids for testing the next time we are working in the area”.

Your information will be provided to the CDFA office that is in charge of your area. Once the office receives your information your call will be handled in the order it was received and an inspector will contact you to make arrangements to pick up samples. Can you please email your name, and contact phone number.

I gave them the benefit of the doubt and sent a response reminding them that the tree wasn't at my house, that I didn't know the homeowner, and that it was accessible in the front yard of the address provided. I asked why I would be responsible to make arrangements for samples as a private citizen, instead of their organization (given that their organization is chartered to handle exactly that kind of thing)?

The response:
I received your email in regards to the property not being in your home. In order for an inspector to survey the property we would need permission from the homeowner. If it is possible to have the homeowner call CDFA to have an inspector survey the citrus tree located in the front yard that would be great.

Every indication is that they're expecting me to facilitate this exchange. Is it incorrect of me to think that CDFA should apply their "government agency" card here to contact the homeowner and continue this process?

Citrus General Discussion / Re: HLB Getting Worse in California
« on: December 23, 2017, 09:51:26 PM »
I see ACP all the time (even today, in the winter) on the citrus in Westchester. If I look daily, I see them daily. 100% certain of ID, they're just under the size of the exclamation mark "!" on a standard keyboard and in the conventional head-down-diagonal feeding position. Neighbors who have used imidacloprid products haven't seen a significant reduction in population.

What worries me is that they don't stop at just the newer/younger growth, but also have been attacking the hardened leaves (and once, even saw one trying to feed on a thorn). Year-round concern.

But the hope is that they aren't (currently) carrying HLB.

Citrus General Discussion / Re: Help with my meyer lemon
« on: November 01, 2017, 01:09:50 AM »
Hi Matt, what are the symptoms on your tree? Do you have old leaves falling?
Mtlgirl, see images here with similar symptoms:

Citrus General Discussion / Re: Help with my meyer lemon
« on: October 30, 2017, 02:23:57 AM »
Millet, thanks. I did catch that in the other thread. Looks like it has Neem extract too. Heavy duty combo with the pyreth. and soaps - probably takes out the beneficials too. I wonder what it's defeating for the improvement?

Citrus General Discussion / Re: Help with my meyer lemon
« on: September 02, 2017, 10:06:30 PM »
I didn't say I agreed ;). But would love a better diagnosis!

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