Powdery. Mildew 2024 Paranoia

[Tropicaltoba]

Can anyone tell me if this is die back from mildew? The flowers all look fine but this branch started to wilt and had this white flakey stuff on the stems.

[roblack]

Not seeing pm. Cold damage?

[Tropicaltoba]

Roblack, Thanks for the response. No… in 4 season gh may get down to 55f with 80% rh at night. Flowering well otherwise. All my other mango are fine but are in the warmer drier area and are just putting out vegetative growth.

[Greater Good]

Sometimes I wake up unexpectedly in the middle of the night, and the reason is, um... powdery mildew paranoia.

[Greater Good]

Sometimes I wake up unexpectedly in the middle of the night, and the reason is, um... powdery mildew paranoia.

LOL

https://youtu.be/fW64WPL_8kM?feature=shared
Hear what Har says ...

[EddieF]

GG, glad you posted above link. Everyone hopefully viewed it.

Wondering how many days Sulfur lasts with no rain & temps under 80.
Spray every 7 days?  1 tablespoon/gallon shower till runoff everywhere i did days ago.
Tomorrow i will again if possible.  I expect crazy opening flowers everywhere.
New open flowers ok with that?

Tuesday

[bovine421]

Is now the time to begin spraying to prevent PM?

If your budding flower panicles over 2" long, it would be a good preventative to spray sulfur.
Sulfur doesn't kill powdery mildew, it prevents it from establishing. Once it establishes, you can blast it off with water to try and wash the spores into the ground. Milstop (Potassium Bicarbonate) is the only organic treatment Once it gets established. If you don't have Milstop in your arsenal, it may be too late once you get it shipped.

Sounds like potassium bicarbonate is the ticket I read somewhere else where someone said it's not an issue on open bloom. Good to know that sulfur is preventative not Curative. Overlooked this thread because without my glasses I thought paranoid was a Latin word for a tropical fruit LOL
Well maybe if we did have a mango subgroup I would have realized paranoia is not a fruit

[pineflatwoods]

I'm now avoiding spraying trees with open bloom with oil, not so much for the pollen, but the pollinators, it also works as an insecticide and will kill them.

[Greater Good]

Alex (Squam256) discusses powdery mildew in the first question of this recorded live stream.

https://www.youtube.com/live/4dAyluuNuMU?feature=shared

[Greater Good]

Sometimes I wake up unexpectedly in the middle of the night, and the reason is, um... powdery mildew paranoia.

When the cold drizzling rain was almost unrelenting,  I caught a 18 hour window Jan 19th and sprayed Double Nickel 55 and Sulfur.  It rained non stop Jan 21 - 23, I then sprayed Cease & Milstop combo. All the flowers looked brown. Never had used a biological fungicide prior to this. My paranoia was heightened when all the flowers looked brown and dead.

Yesterday I took these photos. Not sure if the biological fungicides get the credit, but many panicles survived an anthracnose outbreak and looks like some fruit is setting.

[puglvr1]

For those spraying open and closed flowers with sulfur...with the temperatures rising this week ( mid to upper 80's for me this week) I need to spray asap before it gets to 85° as this is the hottest recommended temperature for spraying sulfur according to directions. I figured as long as I spray in the  morning forecast to be mid 60's to low 70's it should be dry by the time it hits 83° in late afternoon.

Don't want to burn the flowers 

[pineflatwoods]

GG- Your fruit sets look good , and at this point PM won't be a concern- on that tree anyway. I also don't see any sunken panicles from anthracnose-  I would call that a success

[Ermes]

I sprayed for it this morning, haven't seen any signs of it so far. It showed up quite late for me last year end of March- mid April.

Today I started spraying sulphur, the powdery mildew has already attacked the NDM flowers, damn it's still February and I'm at the 38th parallel! Glenn and the others are fortunately clean.
1)Glenn
2) NDM

[roblack]

For those spraying open and closed flowers with sulfur...with the temperatures rising this week ( mid to upper 80's for me this week) I need to spray asap before it gets to 85° as this is the hottest recommended temperature for spraying sulfur according to directions. I figured as long as I spray in the  morning forecast to be mid 60's to low 70's it should be dry by the time it hits 83° in late afternoon.

Don't want to burn the flowers 

If the forecast stays the same, going to wait till late Sunday afternoon/early evening to spray again. Forecast to hit 84F on Sunday, then the next few days the highs are a little lower. Will be right at the 11th day mark, which should be fine as there is a ton of sulfur on trees already, and no rain in sight. 

[puglvr1]

I hope I'm not chasing the Bees away when I spray with sulfur...one article I read said it does not harm Bees but some of them do not like the smell so hopefully it dries quickly and the smell dissipates once its dry, I want and need them to come back and pollinate all the flowers 

Roblack, I think that is a very good idea...my husband sprayed this morning while it was low 70's and should be dry by the time it hits my high of 83° by 3pm...fingers crossed! This should be my last spray, most of the blooms are opening with several
late bloomers, if its necessary I can hit those few a week later once the weather cools off a bit.

Check out my Glenn and see how short the trunk is Lol...its pretty wide but the trunk on this tree has always been short which I prefer my trees short and wide
 

[JR561]

For those spraying open and closed flowers with sulfur...with the temperatures rising this week ( mid to upper 80's for me this week) I need to spray asap before it gets to 85° as this is the hottest recommended temperature for spraying sulfur according to directions. I figured as long as I spray in the  morning forecast to be mid 60's to low 70's it should be dry by the time it hits 83° in late afternoon.

Don't want to burn the flowers 

Am I wrong but I thought Har suggested not spraying within 3 days of temperatures at 85?

[EddieF]

Yes Har said no sulfur if 85F next 3 days.
I toasted my blooms it appears.

[puglvr1]

I had NO idea about the next 3 days after spraying sulfur...I thought as long as you spray when its below 85 which it was (low 70's) and it dries before it reaches mid 80's which I'm not suppose to get that hot today and it dries it would be okay. Live and learn I guess...it is very sad we are even having this conversation today because it's barely the 2nd week of February and should not be talking about temperatures reaching upper 80's!!

Time will tell how damaged my flowers will be  :'( ...

[puglvr1]

Eddie, I'm sorry to hear that and hope that is not the case, best of luck you will still get some mangoes.

It seems I dodged the bullet...today is day 3 after my husband sprayed sulfur. The day he sprayed it hit a high of 85° even though the forecast said it was only suppose to hit 82°...Wed we hit 87° for the high and yesterday it hit 90°!! Thank goodness the blooms still looks nice and healthy. I was very lucky 

Took these a little while ago...

[Greater Good]

Sprayed everything with Sulfur,  Double Nickel 55 and Southern Ag Citrus micronutrient foliar spray this morning.

[Squam256]

PM incidence in general is way down this year compared to last. It’s still out there to be clear, but A lot of people got the wake up call on it last year and were prepared for it this cycle.

[pineflatwoods]

I did control for PM this time around, but I stopped spraying a while ago, and have noticed PM only on one tree- an Orange Essence, it also had it last year as I recall. It will be fruiting size next year, so I'll continue to monitor it going forward.