The Tropical Fruit Forum

Citrus => Citrus General Discussion => Topic started by: drdann on November 30, 2020, 06:13:37 AM

Title: Help - new lemon trees developing yellow spots on leaves
Post by: drdann on November 30, 2020, 06:13:37 AM

(https://i.postimg.cc/SY2SD1b9/lemon-tree-leaf.jpg) (https://postimg.cc/SY2SD1b9)

The trees were planted about 6 months ago - Central Florida.  I have lime trees near these lemon trees but no yellow spots on the lime trees.

Any advice????

Title: Re: Help - new lemon trees developing yellow spots on leaves
Post by: Laaz on November 30, 2020, 07:40:00 AM

Spider mites...

Title: Re: Help - new lemon trees developing yellow spots on leaves
Post by: drdann on November 30, 2020, 08:12:54 AM

thanks - I ordered some insect and mite control - should have it today

Title: Re: Help - new lemon trees developing yellow spots on leaves
Post by: lebmung on November 30, 2020, 08:43:22 AM

If no spidermites,  I suspect a boron deficiency.

Title: Re: Help - new lemon trees developing yellow spots on leaves
Post by: drdann on November 30, 2020, 10:15:58 AM

thanks - I ordered some Miracle Grow Citrus Spikes - but cannot tell if they can provide additional Boron.  Do you have a recommended treatment? 

I was using Miracle Grow General Purpose Shake and Feed.  But perhaps I need something citrus-specific?

Title: Re: Help - new lemon trees developing yellow spots on leaves
Post by: lebmung on December 04, 2020, 05:59:51 PM

Usually all citrus fertilizers have added boron. I don't know what to recommend you, maybe some members from US can .
A spray with microelements might be useful as well. This will go away in time.
Too much Boron can also intoxicate the tree.

Title: Re: Help - new lemon trees developing yellow spots on leaves
Post by: jbclem on December 15, 2020, 09:32:38 PM

To check for spider mites, handheld pocket microscopes are invaluable.  Here are two that I use, they are about 10-16x magnification (ignore the 60x claims), which is just right...you can see the spider mites waving their arms about, you can see the nymphs, the eggs, even the occasional thrip.  You can also put a sheet of white paper under a leaf (spider mites are mostly on the underside), tap on the top of the leaves and look to see if you get a bunch of black specks, some moving.  I run my finger over the specks and if I see a streak of blood I know it wasn't a piece of dust.

https://www.amazon.com/Carson-MicroMini-Lighted-Microscope-Flashlight/dp/B015MS3ICQ/ref=sr_1_10?dchild=1&keywords=led+handheld+pocket+microscope&qid=1608084041&sr=8-10 (https://www.amazon.com/Carson-MicroMini-Lighted-Microscope-Flashlight/dp/B015MS3ICQ/ref=sr_1_10?dchild=1&keywords=led+handheld+pocket+microscope&qid=1608084041&sr=8-10)

https://www.amazon.com/Microscope-Magnifying-Jewelry-Magnifier-Handheld/dp/B07WLCF4VT/ref=sr_1_31?dchild=1&keywords=led+handheld+pocket+microscope&qid=1608084041&sr=8-31 (https://www.amazon.com/Microscope-Magnifying-Jewelry-Magnifier-Handheld/dp/B07WLCF4VT/ref=sr_1_31?dchild=1&keywords=led+handheld+pocket+microscope&qid=1608084041&sr=8-31)
(https://i.postimg.cc/47DF96ZD/Gardening-Carson-pocket-microsope.png) (https://postimg.cc/47DF96ZD)

(https://i.postimg.cc/WtZyPHwT/Gardening-handheld-mini-LED-microscope.png) (https://postimg.cc/WtZyPHwT)