The Tropical Fruit Forum
Tropical Fruit => Tropical Fruit Discussion => Topic started by: BluePalm on February 24, 2012, 02:58:45 PM
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For the past 3 growing seasons the flowers on our mango trees are being attacked by a fast-spreading fungus...before fruit set. Last year it kept our Alphonso from bearing fruit. Spraying the flowers with a fungicide is quite effective. However, we have some larger trees that are really hard to fully spray (with 100% coverage). Has anyone had any experience with this specific fungus?
Thanks,
BluePalm
(http://s14.postimage.org/hca6itldp/fungal_blight.jpg) (http://postimage.org/image/hca6itldp/)
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Powdery mildew.
Sulfur works on it. I use a product that contains sulfur when i see the PM taking a toll.
The big trees are difficult to spray. Depends on how obsessive you get. I used to climb up a 16 ft ladder with a 4 gallon backpack sprayer to take care of Fungus issues. I realized how dangerous that practice was, and I will no longer do that.
If I see it on my small tree, I'll spray..
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That would be powdery mildew. The solution is spraying sulphur. The method...if your trees are of any size.....difficult. It causes tremendous losses in terms of failure to set fruit. Some trees, like Alphonso will not set fruit at my house without sulphur application.
Sleep beat me to the punch!
Harry
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Wow...you guys are Good!! Right on the money Sleep and Harry...Good luck Bluepalm! I've seen those before and they are a pain to deal with. Now I know what it is. Thanks
A014 Diseases of mango bloom (http://www.youtube.com/watch?v=B8-rn3yVO9k#)
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I would not delay on tackling this as powdery mildew can spread and takeover the tree at a very fast rate.
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I've got some PM on my Florigon fruiting trees right now. Will have to get out de olde sprayer. ???
Oscar
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Man....shows you how different our growing conditons are. Here, I would say Florigon is one of the most resistant mango to powdery mildew. I wonder why such a difference??
Harry
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Man....shows you how different our growing conditons are. Here, I would say Florigon is one of the most resistant mango to powdery mildew. I wonder why such a difference??
Harry
Harry, I'm guessing our average rainfall here is 2x what you have? Ours is 150 inches/year. Also this December was very rainy, as in rain almost every single day. December and February are our rainiest months, which plays havoc with mango flowering.
Oscar
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I was aware of the intense rainfall you have. I actually have only recently identified and began to observe powdery mildew. When I first realized what it was, I was shocked to hear that it supposedly prefers cooler, drier conditions. That intially made sense since I was not spraying copper since the weather was cool and dry and I was't expceting much anthracnose. But this year, we have had a warm and, for us, a wet winter. So that would mean more anthracnose and less powdery mildew....right? Nope....lots of both. More than enough to go around. Such is life.
Harry
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I don't remember seeing PM on the mangos here before. Usually anthracnose is the big problem here for mangos.
Oscar
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Yeah, the PM is NASTY It takes over the tree FAST and you can kiss the majority of the crop bye bye. We are spraying fungicide tomorrow. Our Bailey's Marvel is covered in it, and yet a Mallika 20' away doesn't have any on it. Thank you for your quick and informative responses!!
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Just surveyed the yard on a quick walk thru....albeit in the dark with a flashlight. Lots of PM........some culitvars have it bad, but still set lots of fruit. An example is Pickering. Others, no fruit set at all......Alphonso, Bailey's Marvel and Jakarta. Others, too early to tell. On my Thai Everbearing, there is a section of the tree that bloomed slightly earlier than the rest of the tree. That small section has a ton of fruit set. The rest of the tree, with the later blooms....nothing.....just lots of white frosted pannicles from the powdery mildew. I wish I would have paid more attention to the differing conditions that caused this. This weekend will have to be a sulphur spraying intensive weekend.
Harry
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Sorry to hear that Harry! Could you please let me know exactly what you use for the Powdery Mildew...brand name would be great or a link with apicture, Thanks! I've used Copper before for anthracnose but will have to keep a close eye fro PM and would like to be ready with the right product should I need it. While doing some searches I came across a "lime" sulphur...is this the same thing?
Good luck to you and bluepalm getting everything sprayed.
Nancy
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I use this
http://www.bestnest.com/bestnest/RTProduct.asp?SKU=BOP-219 (http://www.bestnest.com/bestnest/RTProduct.asp?SKU=BOP-219)
I buy it at my local Home Depot
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Would Neem Oil be efffective against powdery mildew on a mango tree? I see the beginnings of this fungus on a few of the panicles and figure I should be proactive.
If not Neem Oil, I have this product on hand: http://www.bonide.com/products/product.php?category_id=217 (http://www.bonide.com/products/product.php?category_id=217)
Is it best to spray early morning or late afternoon?
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Thanks Sleepdoc!! Glad to hear I can get it at Home Depot, I HATE paying shipping if I don't have to,lol...
Carbo, looks like the same one Sleepdoc posted.
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Since my Mango trees are small...I was thinking of using one of these pressurized 1.5 liter spray bottles (similar) to the picture from the link below, I'm guessing that would work also instead of the Hose-end sprayer?
http://www.horticulturesource.com/sunlight-supply-1-5-liter-spray-bottle-20-case--p1383/ (http://www.horticulturesource.com/sunlight-supply-1-5-liter-spray-bottle-20-case--p1383/)
Sleepdoc...do you only spray it when you see a problem, or should I spray at 1/2 strength as a preventative? Thanks again!
Nancy
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I have successfully used this:
http://www.hardwareharbor.com/4Lb-Sulfur-Dust-By-Bonide-Products_p_64321.html (http://www.hardwareharbor.com/4Lb-Sulfur-Dust-By-Bonide-Products_p_64321.html)
Harry
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Would Neem Oil be efffective against powdery mildew on a mango tree? I see the beginnings of this fungus on a few of the panicles and figure I should be proactive.
If not Neem Oil, I have this product on hand: http://www.bonide.com/products/product.php?category_id=217 (http://www.bonide.com/products/product.php?category_id=217)
Is it best to spray early morning or late afternoon?
No, neem oil will not have any effect on powdery mildew.
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Since my Mango trees are small...I was thinking of using one of these pressurized 1.5 liter spray bottles (similar) to the picture from the link below, I'm guessing that would work also instead of the Hose-end sprayer?
http://www.horticulturesource.com/sunlight-supply-1-5-liter-spray-bottle-20-case--p1383/ (http://www.horticulturesource.com/sunlight-supply-1-5-liter-spray-bottle-20-case--p1383/)
Sleepdoc...do you only spray it when you see a problem, or should I spray at 1/2 strength as a preventative? Thanks again!
Nancy
In the past, I only sprayed when I saw some evidence of PM. This year, I sprayed in Dec or Jan to try and kill whitefly. I don't think it did much for the whitefly, but I have not yet seen any evidence of Powdery Mildew on my flower panicles. Not sure if there is a correlation.
Also, be sure not to spray in in a close time proximity to the oil sprays (2 weeks?). They interact and can damage the plant. i believe this holds true for all sulfur products..
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Thanks for the link Harry.
Appreciate the info also Sleepdoc.
Upon checking out my blooms today I noticed a few of these on my Glenn...I think its PM...what do you guys think? Should I spray ALL the blooms even the ones that don't look affected? I just don't want to spray it with the wrong stuff if its not PM and kill the blooms instead... Thanks again!!
(http://s18.postimage.org/qsn2zfu7p/Fungus_Powdery_mildew_2_25_12_001.jpg) (http://postimage.org/image/qsn2zfu7p/)
(http://s18.postimage.org/5s23bmx11/Fungus_Powdery_mildew_2_25_12_004.jpg) (http://postimage.org/image/5s23bmx11/)
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Would Neem Oil be efffective against powdery mildew on a mango tree? I see the beginnings of this fungus on a few of the panicles and figure I should be proactive.
If not Neem Oil, I have this product on hand: http://www.bonide.com/products/product.php?category_id=217 (http://www.bonide.com/products/product.php?category_id=217)
Is it best to spray early morning or late afternoon?
Good question. I have used it successfully for black sooty mold. Give neem a try and report back to us. Time of the day for spraying is not the issue....its temperature and sun. I prefer to spray either early or late or when it is overcast. Definitely better and less dangerous when it is cooler rather than when it is warmer.
Harry
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PM is on the leaves of my Florigon and curling the leaves.
Here you can buy a 50 pound bag of wettable sulfur for about same price as you'er paying for that product from Home Depot that only makes 25 gallons. BTW pyrethrin in that prodcut doesn't do anything to PM. Pyrethrin is an insecticide.
Oscar
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Is the Bonide Citrus Fruit and Nut sulfur spray safe to use on lychees and longans?
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I don't see why not.....I wouldn't hesitate to use it on either lychees or longans.
Harry
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If the weather is too hot and sunny for wettable sulfur, you may want to try a new organically-approved systemic fungicide that you can get at Home Depot or Lowes:
ORGANOCIDE PLANT DOCTOR, which is a clear odorless, non-oily liquid of mono-potassium salt of phosphorous acid. This is totally unlike the smelly fish-oil "Organocide 3-in1." Though Plant Doctor is labeled only for anthracnose on mango bloom, I read elsewhere that this active ingredient is also effective on powdery mildew. As there is usually also some anthracnose around, and since most fungicides work best as preventives, before you even see any symptoms, you will not be out-of-line using this product.
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Thanks for the tip. I don't think our Home Depot carries Organocide or Bonide products mentioned as being carried in Florida. I think it's up to individual store managers what they carry and don't carry in their stores. You will probably see differences in products carried even in different parts of Florida.
Oscar
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Thanks Har! Sounds like a good one to check out...
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Oh great, another infirmity I need to look out for :o
Can you guys post some more pictures of what it looks like on the leaves? Little white/grey dotty areas?
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Gwenn, the weird thing is (actually I guess its a good thing!) I don't have it on my leaves...not least NONE that I can see. Its only on a few of my Bloom spikes...I would be interested in seeing what it looks like on the leaves also to make sure I know what I'm looking for.
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Gwenn, the weird thing is (actually I guess its a good thing!) I don't have it on my leaves...not least NONE that I can see. Its only on a few of my Bloom spikes...I would be interested in seeing what it looks like on the leaves also to make sure I know what I'm looking for.
PM had made the leaves on my Florigon curl up lengthwise. It looks like a light sprinkling of talcum powder on the leaf. I didn't photo it as i didn't want any fond memories of it. :-\
Oscar
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PM had made the leaves on my Florigon curl up lengthwise. It looks like a light sprinkling of talcum powder on the leaf. I didn't photo it as i didn't want any fond memories of it. :-\
Oscar
Lol Oscar, I don't blame you for not wanting any memory to that either.
I purchase the 3-in-1 Organocide at Walmart for under $14...we had over 2" of rain last night...Amazing since the last time we had any significant rain was Halloween of last year except for a two tenths of an inch a couple of weeks ago, we've been VERY dry. Luckily, I sprayed the trees on Saturday with Copper ( I didn't have any sulfur) and was planning on getting something for the PM this week.
I will probably wait a week before I spray it with the Organocide since I just sprayed it with Copper.
(http://s11.postimage.org/4kfsjldtr/3_in_1_Organocide.jpg) (http://postimage.org/image/4kfsjldtr/)
This link tells more about what Organocide will do...
http://www.organiclabs.com/InfoSheets/3in1FAQ.pdf (http://www.organiclabs.com/InfoSheets/3in1FAQ.pdf)
BTW, it took me several tries before the server would download the picture...definitely having issues.
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PM had made the leaves on my Florigon curl up lengthwise. It looks like a light sprinkling of talcum powder on the leaf. I didn't photo it as i didn't want any fond memories of it. :-\
Oscar
Lol Oscar, I don't blame you for not wanting any memory to that either.
I purchase the 3-in-1 Organocide at Walmart for under $14...we had over 2" of rain last night...Amazing since the last time we had any significant rain was Halloween of last year except for a two tenths of an inch a couple of weeks ago, we've been VERY dry. Luckily, I sprayed the trees on Saturday with Copper ( I didn't have any sulfur) and was planning on getting something for the PM this week.
I will probably wait a week before I spray it with the Organocide since I just sprayed it with Copper.
(http://s11.postimage.org/4kfsjldtr/3_in_1_Organocide.jpg) (http://postimage.org/image/4kfsjldtr/)
This link tells more about what Organocide will do...
http://www.organiclabs.com/InfoSheets/3in1FAQ.pdf (http://www.organiclabs.com/InfoSheets/3in1FAQ.pdf)
BTW, it took me several tries before the server would download the picture...definitely having issues.
Nancy - I think Har was saying to use Organocide Plant Doctor for PM, not their 3 in 1.
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Here is the spray program that I use up here in Centrel Florida on the mango grove on Merritt Island.
I broke it down for smaller applications. Hope this helps.
GENERAL SPRAY FOR CONTROL OF POWDERY MILDEW & ANTHRACNOSE
PRE BLOOM
Start to spray before bloom emerges from the stem or no later than 2 to 3 inches long. With a combination of Sulfur/ and one of the below.
Diathran 78= 2 ½ TBLS per gallon
Diathran 45= 2 ½ TBLS per gallon
Manzit 50 = 3 TBLS per gallon
Kaptan 50 = 3 TBLS per gallon
BLOOM
Spray weekly until fruit set of Buck-Shot size with the following.
Diathran 78= 2 ½ TBLS per gallon
Diathran 45= 2 ½ TBLS per gallon
Manzit 50 = 3 TBLS per gallon
Kaptan 50 = 3 TBLS per gallon
Then on the sixth week, spray with sulfur for mildew control again.
Sulfur is 2oz per gallon of H2O.
*** Remember to add Spreader Sticker to each batch of mix.***
Final spray should be a Copper spray when the mangos are the size of a goose egg. we use wettable copper.
Liquid coppers differ in strength, so follow the manufactures label plus spreader sticker.
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Here is the spray program that I use up here in Centrel Florida on the mango grove on Merritt Island.
I broke it down for smaller applications. Hope this helps.
GENERAL SPRAY FOR CONTROL OF POWDERY MILDEW & ANTHRACNOSE
PRE BLOOM
Start to spray before bloom emerges from the stem or no later than 2 to 3 inches long. With a combination of Sulfur/ and one of the below.
Diathran 78= 2 ½ TBLS per gallon
Diathran 45= 2 ½ TBLS per gallon
Manzit 50 = 3 TBLS per gallon
Kaptan 50 = 3 TBLS per gallon
BLOOM
Spray weekly until fruit set of Buck-Shot size with the following.
Diathran 78= 2 ½ TBLS per gallon
Diathran 45= 2 ½ TBLS per gallon
Manzit 50 = 3 TBLS per gallon
Kaptan 50 = 3 TBLS per gallon
Then on the sixth week, spray with sulfur for mildew control again.
Sulfur is 2oz per gallon of H2O.
*** Remember to add Spreader Sticker to each batch of mix.***
Final spray should be a Copper spray when the mangos are the size of a goose egg. we use wettable copper.
Liquid coppers differ in strength, so follow the manufactures label plus spreader sticker.
Just what I want with my mangos...
Dithane(45 and 78) contains mancozeb and ETU, both known to the state of California to cause cancer. ETU is also known to the state of California to cause birth defects. http://www.dowagro.com/turf/prod/dithane.htm (http://www.dowagro.com/turf/prod/dithane.htm)
Captan is considered a probable human carcinogen by the EPA. http://www.epa.gov/oppsrrd1/REDs/factsheets/0120fact.pdf (http://www.epa.gov/oppsrrd1/REDs/factsheets/0120fact.pdf)
Manzate - Also contains mancozeb and ETU.
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OMG Rob...Thank you for pointing that out! You are SO right...its a good thing I haven't opened it yet,lol...its going back to Walmart. But, after researching Organocide Plant Doctor I haven't been able to come up with a picture to see what it looks like. I' called the 3 major big box stores and NO one sells the Plant Doctor. I'll have to email the company and see if its available for retail?
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Okay...I found this link http://organiclabs.com/Retail.html (http://organiclabs.com/Retail.html) for the Plant Doctor. I emailed the company to see if they can tell me who might carry it in my area.
Thanks again Rob for pointing that out!
Nancy
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Lover of Pugs: I bought some at a Home Depot in Lake Worth. Possibly your store would be willing to order it for you?
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Thanks Mangomandan...I will print out the picture with the UPC label I found and bring it to see if the manager would order it for me, appreciate it!
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After doing a little more research on Org. Plant Doctor...I found out that it has the same ingredients as
Excel LG Fungicide (by Organic Laboratories, Inc.) https://www.planetnatural.com/planetnatural/images/exel-lg-label.pdf (https://www.planetnatural.com/planetnatural/images/exel-lg-label.pdf)
Here's the one for Organocide Plant Doctor http://organiclabs.com/Images/LabelImages/Plant%20Doctor%20Back%20Label%20Booklet%20Instructions%20for%20Use.pdf (http://organiclabs.com/Images/LabelImages/Plant%20Doctor%20Back%20Label%20Booklet%20Instructions%20for%20Use.pdf)
So...I believe these two products are the same thing and made by the same company, at least both bottles have the same Address listed?? Coincidence...Hmmm...food for thought.
Mangomandan, just got off the phone with the manager of the Garden Center of Home depot, he said NO go on ordering Plant Doctor for me because its NOT available in his district...sucks!! Especially because I don't like paying shipping!!
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I see that Amazon sells Exel LG Systemic Fungicide Concentrated Pint for $20, including free shipping. I don't know how that compares to buying it elsewhere.
I've been trying to compare the ingredients in these various products, but it just makes my poor English-major brain hurt. So many variations on phos**** It would be nice to read some field trials of the efficacy, but I haven't come across any so far.
After doing a little more research on Org. Plant Doctor...I found out that it has the same ingredients as
Excel LG Fungicide (by Organic Laboratories, Inc.) https://www.planetnatural.com/planetnatural/images/exel-lg-label.pdf (https://www.planetnatural.com/planetnatural/images/exel-lg-label.pdf)
Here's the one for Organocide Plant Doctor http://organiclabs.com/Images/LabelImages/Plant%20Doctor%20Back%20Label%20Booklet%20Instructions%20for%20Use.pdf (http://organiclabs.com/Images/LabelImages/Plant%20Doctor%20Back%20Label%20Booklet%20Instructions%20for%20Use.pdf)
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Thanks mangomandan for the link...I'll order if I can't find it locally. Still working on a local source.
The one you purchased at Home depot, does it have the "Plant Doctor" on the container or Exel LG?
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The one I bought said Plant Doctor. It was the first time I've seen it at the local HD. I hope it turns out to be good stuff, and hope HD continues to stock it. I haven't had many good years for mangos since the hurricanes of 2004, and I really want this year to be fruitful.
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Thanks Dan!! I think I found a HD that's going to order it for me...keep fingers crossed!
I totally understand what you're saying...my Glenn that has the PM is the closest I've ever seen this tree to giving me some fruit since I planted it 5 years ago, every year prior to this...it was severely damaged by the freeze... So I totally feel your pain. I have NO idea "if" any of these bloom spikes will hold fruit either...Good luck to us both, and hope the product works.
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I bought and used Bonide on my lychees and longans to control scale insects. I did not use it on the mango blossoms because it contains pyrethrins, and I didn't want to kill any pollinating insects. I'm not sure how long the toxicity of pyrethrins remains on blossoms...any thoughts? Instead of the Bonide we used a mix of available fungicides in our garage and it stopped the PM dead in its tracks. I will however use the Bonide on small and developing fruit. Harry, did you ever have to mass-spray your yard for powdery mildew?
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I have never mass sprayed for anything in my yard. I do spot spraying, if that. The crop suffers but such is life in mango paradise. This year, I have noticed for the first time, heavy powdery mildew on the leaves (some of them at least) of my Glenn tree. I haven't seen it on the leaves elsewhere. only on blooms pannicles. I haven't sprayed as of yet and may not get a chance to. We'll see. Probably won't do too terribly much to the tree overall, except curl a few leaves. Too be continued.
Harry
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how can you tell the difference between powdery mildew and anthracnose on mango flowers? I got some brown and almost black dead flowers.....
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Powdery mildew will coat your flowers with a fine white fuzzy mildew. Anthracnose turns them black.
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thanks, think i got anthracnose then...
do you suggest i cut off the dead/blackened flower or stem so it wont get the rest infected?
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I wouldn't cut them off...just spray the panicles with a good fungicide.
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I like this site about problems with mango-tree's.
http://www.abc.net.au/local/videos/2011/05/05/3208266.htm (http://www.abc.net.au/local/videos/2011/05/05/3208266.htm)
This guy seems to have the perfect spray for mango's anthracnose. I cannot hear what he uses as a "sticker" though because my english is not that perfect.
Copperoxy-chloride and mancozeb+ is what he uses but what is "Agril"? and what is a good substitute for it because i m sure i cannot buy it here locally.
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Forgot to copy the link: Solly
http://www.nt.gov.au/d/Content/File/p/Fruit/Mango_Field_Guide.pdf (http://www.nt.gov.au/d/Content/File/p/Fruit/Mango_Field_Guide.pdf)
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Good reference book. I like the BIG photos.
as for the sticking agent, I think he said Ag-oil as in Agricultural oil. of course Aussie is not my language ;D ;)