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Author Topic: Guava  (Read 1768 times)

mangaba

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Guava
« on: June 20, 2016, 05:52:18 PM »
 One of my  guava trees has leaves with motled red coloured patches. Is this  problem result of a Pest ? a  Disease ? or a nutrition problem?
 How could I remedy this in my plant ?   I have other guava trees with normal green leaves.



gnappi

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Re: Guava
« Reply #1 on: June 20, 2016, 06:04:31 PM »
Have you sprayed with anything recently?

 I accidentally caused the exact symptom after spraying with a too rich mixture of horticultural oil.
Regards,

   Gary

CGameProgrammer

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Re: Guava
« Reply #2 on: June 21, 2016, 02:24:48 AM »
It could just be cold damage. I know it's winter in the southern hemisphere; are you in a relatively cool area of Brazil? My trees sometimes get red spots on the leaves in winter but it doesn't kill the tree or anything.

EvilFruit

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Re: Guava
« Reply #3 on: June 21, 2016, 09:38:51 AM »
myrtle rust disease ,maybe ?! 😥
« Last Edit: June 21, 2016, 09:41:37 AM by EvilFruit »
Moh'd

mangaba

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Re: Guava
« Reply #4 on: June 22, 2016, 05:33:57 PM »
In response to questions posted: I have never sprayed my guavas with a liquid fertilizer or fungicide. I live in northeast of Brazil where the climate is warm all through  the year. Interesting fact is that this mottling has affected on part of the tree.  On examining my other guavas I noted that I have one more small  tree completely with this problem (i.e. all leaves affected with no green colour)

nelesedulis

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Re: Guava
« Reply #5 on: June 22, 2016, 07:43:14 PM »
Hi,

analyzing the photos, these symptoms are caused by this nematode.

Nematóide da galha – Meloidogyne enterolobii









One of my  guava trees has leaves with motled red coloured patches. Is this  problem result of a Pest ? a  Disease ? or a nutrition problem?
 How could I remedy this in my plant ?   I have other guava trees with normal green leaves.


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Delvi83

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Re: Guava
« Reply #6 on: June 23, 2016, 05:28:54 PM »
I think you should wait new growth to know the real plant-damage..

mangaba

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Re: Guava
« Reply #7 on: June 23, 2016, 05:43:49 PM »
Nelesedulis-  If it is a nematode how could I get rid of these?  How could I identify them ?
Delvi83 - There is no growth in the affected branches.

I am attaching an additional image


Delvi83

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Re: Guava
« Reply #8 on: June 25, 2016, 09:07:57 AM »
Are others Guava putting new leaves? are you in tropical or subtropical area?

greenman62

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Re: Guava
« Reply #9 on: June 26, 2016, 10:32:30 AM »
Nelesedulis-  If it is a nematode how could I get rid of these?  How could I identify them ?
Delvi83 - There is no growth in the affected branches.

I am attaching an additional image



try worm tea, or compost tea, mulch...
beneficial micro-organisms can outcompete the bad guys.
chitin (crab shell) and sesame oil supposedly help too.

plant mustard and marigolds helps in the long term
i use mustard as mulch and it helped a lot !

if you have a microscope, you can pull a soil sample from near the roots
there are several types of nematodes, but they have different mouth parts
you can ID them from that...
http://entnemdept.ufl.edu/creatures/nematode/soil_nematode.htm

prepare a soil sample and using the microscope.
https://www.youtube.com/watch?v=H8CClDH7jW0
part 2
https://www.youtube.com/watch?v=IBHzJb0TpxU

nematodes
https://www.youtube.com/watch?v=c2mPVFWIfqs

Treating root Knot Nematodes with Neem, marigolds & molasses
https://www.youtube.com/watch?v=6RchoW9lxGQ

keeping soil healthy...
https://www.youtube.com/watch?v=xzthQyMaQaQ


microscope $32
http://www.ebay.com/itm/8LED-1000X-10MP-USB-Digital-Microscope-Endoscope-Magnifier-Video-Camera-w-Stand-/262463602496?hash=item3d1c0cbf40:g:8QwAAOSwLs5XKGMg

mangaba

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Re: Guava
« Reply #10 on: June 26, 2016, 07:02:09 PM »
Delvi 83:  I live in a very tropical area. I have many guava trees but only 2-3 show this mottling in their braches. If I leave the branches as they are, there is no new growth in these branches. It is my impression that this  problem stunts growth.
Greenman62: Thank you for your valuable hints in trying to identify nematodes and get rid of them ! Valuable info
                       I need to confirm by opinion of experts and examination  in loco that it is nematode infection.   

 

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