Pests and Diseases forum: is this appearance from a nutrient deficiency?

Views: 231, Replies: 7 » Jump to the end
Name: Carl
Topanga Canyon CA 90290 I can
just retired to 1/2 acre in Topanga
Image
cgrooms
Feb 14, 2016 11:51 PM CST
one is an orange tree. the other three are an avocado. they are about 20 feet apart. both trees are mature. they are at my new home where i have only been for a month so i don't know much history but think they are both around ten years old. they are planted on a hillside in Sunset zone 20-21.

Carl
Thumb of 2016-02-15/cgrooms/2c3e7b


Thumb of 2016-02-15/cgrooms/5100e1


Thumb of 2016-02-15/cgrooms/217eff


Thumb of 2016-02-15/cgrooms/f79ce1

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Feb 15, 2016 9:51 AM CST
Welcome! to ATP

The orange plant in the first pic could have a nutrient issue. Are the symptoms primarily on the newest leaves or the oldest ones? Or, if it is all over, is it worse on the youngest or oldest?

The avocado problem looks like it is most likely a leaf spot disease, compare with these images:

https://www.google.ca/search?q=avocado+leaf+spot&client=safa...
Name: Carol
Santa Ana,Ca. (Zone 10b)
Sunset zone 22
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
Image
ctcarol
Feb 15, 2016 3:46 PM CST
The citrus looks like iron deficiency.
The avocado looks like Persea mites.
Name: Carl
Topanga Canyon CA 90290 I can
just retired to 1/2 acre in Topanga
Image
cgrooms
Feb 25, 2016 8:45 PM CST
i will look at the orange tree tomorrow. i think the older leaves. it is just starting to leaf out for the season.
the avocado tree seems to have all the spots on the veins. if it is mites what is the best treatment?
Name: Carol
Santa Ana,Ca. (Zone 10b)
Sunset zone 22
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
Image
ctcarol
Feb 25, 2016 9:07 PM CST
http://www.crfg.org/pubs/ff/avocado.html This may be of help. On the citrus trees, Iron deficiency usually does show in the mature leaves. This can be solved with Chelated Iron feeding. BUT the drought has prevented the bad stuff from leaching out of the root zone, so all of our plants are under stress. Deep watering can ,but the bottom line is WE NEED lots of rain.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Feb 26, 2016 7:06 AM CST
Iron deficiency in plants typically appears on the youngest leaves first, which is why I asked which leaves the problem starts on. Where the symptoms start helps narrow down the nutrient involved, if it is a nutrient issue, because some nutrients can be moved around to where the plants need them and others can't. Symptoms on the youngest leaves first suggest a nutrient that can't be moved around, symptoms on the oldest leaves first indicates a mobile nutrient so the plant takes it from the older leaves to give to the younger growing ones. This article has some pictures of nutrient issues in citrus that may help:

https://edis.ifas.ufl.edu/ch142

Do you have any idea what your soil pH is? That can also help narrow things down.
Name: Mika
Oxfordshire, England and Mento
Plant Lover: Loves 'em all! Critters Allowed Daylilies Irises Roses Hostas
Birds Multi-Region Gardener Cat Lover Dog Lover Ponds Foliage Fan
Image
cliftoncat
Mar 13, 2016 4:44 AM CST
Brilliantly helpful article! Thumbs up
Name: Carol
Santa Ana,Ca. (Zone 10b)
Sunset zone 22
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
Image
ctcarol
Mar 13, 2016 1:23 PM CST
I agree It is! Now I need to check my Citrus and Avocado food for these elements.

« Garden.org Homepage
« Back to the top
« Forums List
« Pests and Diseases forum
You must first create a username and login before you can reply to this thread.

Today's site banner is by Baja_Costero and is called "Agave"