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Old 09-30-2012, 10:13 AM   #1 (permalink)
 
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Default Someting wrong with my fruit tree

please can somewone look at the leaf of my fruit tree and let me know what wrong?
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Old 09-30-2012, 10:19 AM   #2 (permalink)
 
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Default Re: Someting wrong with my fruit tree

citrus leafminers
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Old 09-30-2012, 01:06 PM   #3 (permalink)
 
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Default Re: Someting wrong with my fruit tree

Definitely leafminer. No need to remove the leaves, they are still functional.
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Old 09-30-2012, 04:17 PM   #4 (permalink)
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Default Re: Someting wrong with my fruit tree

leaf miners are inside the leaves and you must use a SYSTEMIC insecticide to combat them one they are IN.

Imidacloprid is the active ingredient in Bayer Tree and Shrub, that is probably the most concentrated version @ Home Depot. (edit just looked and BTS has 6X Bayer Garden blue bottle)
I prefer Dimethoate on non bearing trees, and Imidacloprid on bearing due to a perceived change in fruit taste by Dimethoate.


info on citrus pests, leafminer down 1/3 of the way
ENY-734/IN686: 2012 Florida Citrus Pest Management Guide: Asian Citrus Psyllid and Citrus Leafminer

good luck
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Old 09-30-2012, 05:11 PM   #5 (permalink)
 
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Default Re: Someting wrong with my fruit tree

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Originally Posted by G.W. View Post
leaf miners are inside the leaves and you must use a SYSTEMIC insecticide to combat them one they are IN.
Imidacloprid is the active ingredient in Bayer Tree and Shrub, that is probably the most concentrated version @ Home Depot.
I prefer Dimethoate on non bearing trees, and Imidacloprid on bearing due to a perceived change in fruit taste by Dimethoate.
Keep in mind that there is good scientific evidence that systemic insecticides like Imidacloprid can harm your pollinators, bees.

You might try Spinosad. It seems to work for citrus leafminers in my yard, and if you apply it in the evening (and especially if you work to avoid the flowers), probably has little if any effect on bees.
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Old 09-30-2012, 06:15 PM   #6 (permalink)
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Default Re: Someting wrong with my fruit tree

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Originally Posted by venturabananas View Post
Keep in mind that there is good scientific evidence that systemic insecticides like Imidacloprid can harm your pollinators, bees.

You might try Spinosad. It seems to work for citrus leafminers in my yard, and if you apply it in the evening (and especially if you work to avoid the flowers), probably has little if any effect on bees.
Spinosad is also toxic to bees.
Radcliffe's IPM World Textbook | CFANS | University of Minnesota.
http://ec.europa.eu/food/plant/prote...osad_in_en.pdf

low dose effects
Lethal and sub-lethal effects of spinosad on ... [Pest Manag Sci. 2005] - PubMed - NCBI


I also shows poor control of thrips, which are the vector for TSWV. (major disease of peppers and tomatoes)
Journal of Entomological Science (2002) 37, 143-153 - PestinfoWiki
UC IPM: UC Management Guidelines for Tomato Spotted Wilt Virus on Peppers


real answer LD50 for honeybees
dimethoate .12ug
imidacloprid .049ug
spinosad .057ug .
Anyone feel free to correct those...
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WORST BUNCH hua moa, 2 fingers

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Old 09-30-2012, 07:41 PM   #7 (permalink)
 
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Default Re: Someting wrong with my fruit tree

Quote:
Originally Posted by claudey View Post
please can somewone look at the leaf of my fruit tree and let me know what wrong?
Not much of a a citrus grower - - I'm guessing CLM (citrus leaf miner)
See this forum -http://citrus.forumup.org
good luck
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Old 10-01-2012, 12:16 AM   #8 (permalink)
 
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Default Re: Someting wrong with my fruit tree

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Originally Posted by G.W. View Post
Spinosad is also toxic to bees.

real answer LD50 for honeybees
dimethoate .12ug
imidacloprid .049ug
spinosad .057ug .
Anyone feel free to correct those...
LD50's are pretty meaningless, unless you are sitting there spraying that concentration on the the critter. Sub-lethal effects occur at much lower doses. In other words, LD50's are what people do in labs with animals, not what happens in the field.

My point about Spinosad -- and I am not advocating its widespread use -- was that simply because it is not a systemic, you could keep it away from the food source of bees -- the flowers -- and apply it at times of day when bees are not active. This would only be practical as a hobbyist, for a few plants, not as a commercial grower. A systemic like imidacloprid will be in the nectar and pollen for weeks to months, whenever a bee visits.
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Old 10-01-2012, 12:41 AM   #9 (permalink)
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Default Re: Someting wrong with my fruit tree

exactly




I only spray for CLM when there are citrus growth flushes and other trees for ants/aphids/scale

my perspective is many "only one I have of that kind" plants which cost a lot of money
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Old 10-01-2012, 03:09 AM   #10 (permalink)
 
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Default Re: Someting wrong with my fruit tree

Over the last few decades there has been great research on citrus at UC Riverside, and in the last couple years I'd been able to piggy back on some of the student's research findings. There are many acres of trees which cannot be used for anything other than research (no eating fruit). Yes, it's that extensive. It has been found that although leaf miners leave a pretty unsightly patch of foliage (especially new foliage), the typical amount of foliage damage they do on a fruit bearing size tree is insignificantly affecting fruit production, and any use of pesticides should be considered for aesthetic use only. Not in prevention of fruit loss since they do not bore into pedicels, peduncles, or calyxes. Where it can be helpful is when a very young plant gets severely affected, which likely is not high in fruit production yet.

Overall, at least for borer issues on mature trees, I would suggest to leave them without treatment since it seems to show that there are more chances of fruit containing toxin byproducts from these pesticides no matter which you chose, since they all catalyze into other chemical compounds once absorbed into the xylem.

One effective treatment which is natural and more of a preventative (early season) is Neem Oil sprayed on the circumference (top and bottom of foliage). This is a very effective deterrent for the moth to lay eggs on the underside of the leaf at the side of the spine. The moths tend to lay eggs from June through Oct-Nov (depending on area). So knowing this, early June through Sept-Oct would likely be the best time for application. It is difficult to see the moths since they are very tiny and only active from dusk to dawn.

I hope this helps on the answer of the leafminers.
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Last edited by planetrj : 10-01-2012 at 12:07 PM.
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Old 10-01-2012, 07:49 AM   #11 (permalink)
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Default Re: Someting wrong with my fruit tree

Quote:
Originally Posted by planetrj View Post
Where it can be helpful is when a very young plant gets severely affected, which likely is not high in fruit production yet.

since it seems to show that there are more chances of fruit containing toxin byproducts from these pesticides, no matter which you chose,
well put , just wanted to emphasize these
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winter winners, jackfruit, carambola, hua moa, d namwah, hak ip lychee with pink leaves 2 days before a cold snap eeeek!

Winter losers, kohala longan, misi luki, 80% jackfruit seedling loss

first bloomers, HUA MOA, DC, D NAMWAH, FHIA 17, KANADARIAN, RAJA PURI, M D NAMWAH

best bunch FHIA 17 , undisclosed

WORST BUNCH hua moa, 2 fingers
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