Ask a Question forum: Avocado brown leaves

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South Italy
cereal
Aug 16, 2017 5:30 AM CST
Hello,

I have four Avocado plants, 1,5 year old, growth in pots from seeds, they are in between 1 and 3 feet tall. In the latest few weeks the leaves are becoming brown and they appear as burnt, I'm attaching a photo of one of these leaves, which has the sizes of a palm hand. I wonder if this is caused by heat, as in the last month, we have been dealing with heat spikes around 104°F. Could you give me an advice?

Thanks for your attention!

Thumb of 2017-08-16/visitor/0ecb36

[Last edited by cereal - Aug 16, 2017 7:01 AM (+)]
Give a thumbs up | Quote | Post #1529201 (1)
Name: Will Creed
NYC
Professional indoor plant consultan
Image
WillC
Aug 18, 2017 12:19 PM CST
The symptoms on that leaf are generic, meaning it can have multiple causes. The heat could be the problem, but it would be best if you posted a photo that shows the entire plant and provided more info about its environment.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
I now have a book available on indoor plant care
South Italy
cereal
Aug 20, 2017 4:15 AM CST
Hello,

thanks for your reply. The plants are exposed, at this time of year, to direct sun up until 10AM, then they get shadow for the rest of the day. They are in small pots, just to be able to move them easily: in winter here it snows a lot and I have to keep them inside. In summer I water them every other day or every day if the soil gets dry and cracked. We live at 2,600 above sea level and here, usually, there is very low humidity.

I removed most of the leaves from the photographed plant because they were cracking. I have to say that I have also found few caterpillars that were eating the leaves, but I don't think this can be related to the issue.

I'm not using fertilizers. The soil is generic, with an acid base of pH 8.2.
Let me know if you need more specific information.

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[Last edited by cereal - Aug 20, 2017 4:16 AM (+)]
Give a thumbs up | Quote | Post #1531791 (3)
Name: Will Creed
NYC
Professional indoor plant consultan
Image
WillC
Aug 20, 2017 8:14 AM CST
A pH of 8.2 is too high (alkaline) and is probably interfering with the absorption of certain important nutrients. If the water you use is on the hard side (high mineral content), then that is the likely cause of the high pH. Sulfur is typically recommended to lower the pH to a range where the nutrients in the soil will become available. You could also use an acid fertilizer, such as Miracid.

Since you are moving your plants indoors in the colder months, then I suggest you protect them from any direct outdoor sun. If you are having a hard time keeping the soil moist, it may be time to move them into larger pots that have more soil to retain water longer.
Will Creed
Horticultural Help, NYC
www.HorticulturalHelp.com
I now have a book available on indoor plant care
South Italy
cereal
Aug 20, 2017 9:19 AM CST
Water in my area is evaluated 14fH° (which should be 1.4ppm) so yes it is in the hard side. It makes a lot of sense now, I will try your suggestions.

Thank you!

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