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Alocasia cucullata DISEASE white cotton Fungus like White Cotton sticking on underside of leaves

#1 User is offline   raintree 

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Posted 10 May 2012 - 03:08 PM

Can someone advise what is reuired to get rid of this white cottony fungus on the underside of leaves.

(1) Can I manually use a cotton bud to clean it off if possible? as they are quite accessible

(2) Is there any pesticide or homebrew/household kitchen use that can be used to spray/wipe to prevent occurance.

(3) Why does this fungus appear. It it because of insufficient sunlight.

(4) Does this plant need fertiliser and if so hw often.

(5) How many times a week is watering required.

(6) How many hours of sunlight required. I have it in the balcony where sunlight is not direct.

(7) I some some other types of yam plany with leaves yellowing at the deges. What caused.

(8) Is the sap poisonous?

(9) Does this plant attarct more mosquitoes than other big leave plants.

Thank you very much to those who directed me with a list of nurseries in Singapore.

These are the pics.

The pic with WHITE FUNGUS

http://i491.photobuc...to/P1090383.jpg

The pic of the plant that I coveted for several years.

http://i491.photobuc...to/P1090382.jpg


Thank you once again.

This post has been edited by raintree: 10 May 2012 - 03:42 PM

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#2 User is offline   klanning 

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Posted 11 May 2012 - 12:15 AM

Looks like Mealy Bugs.

Just use the Horti Brand Insecticide to get rid of it should be fine I suppose.
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#3 User is offline   Daddel 

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Posted 11 May 2012 - 12:20 PM

Malathion is effective and available in most nurseries.
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#4 User is offline   raintree 

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Posted 11 May 2012 - 12:56 PM

Is Malathion too strong for this type of leaves ? I know it has a pungeant smell.

How is to be applied. Can I dip cotton bud and brush against the Mealy bugs.

What causes these Mealy bugs to appear? What precaution must I take to reduce the incidence of this bugs.


Thank you.
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#5 User is offline   Greyfingers 

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Posted 11 May 2012 - 01:17 PM

View Postraintree, on 11 May 2012 - 12:56 PM, said:

Is Malathion too strong for this type of leaves ? I know it has a pungeant smell.

How is to be applied. Can I dip cotton bud and brush against the Mealy bugs.

What causes these Mealy bugs to appear? What precaution must I take to reduce the incidence of this bugs.


Thank you.


You buy and the instruction is on the bottle. Malathion can also be used on vegetables. So I guess it's OK on 'yam'.
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#6 User is offline   Bob O'H 

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Posted 28 August 2012 - 01:48 AM

I have something similar on my alocacia, but it's definitely fungal. I thought it might be mildew, but I'm pretty sure it's systemic: it mainly pops up on the underside along the veins of the plant, so I assume most of the mycewlia are internal.

Does anyone have any suggestions for what it is (sorry, it's not mealybugs) and how to treat the plants? I've no idea what fungicides are used on houseplants (which is slightly embarrassing - for a time I worked on fungicides in agriculture).
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#7 User is offline   hotsummer 

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Posted 28 August 2012 - 09:43 AM

Should be too much water, the bottom can not have full sunlight, and try to improve.
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#8 User is offline   Greyfingers 

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Posted 28 August 2012 - 12:00 PM

View PostBob O, on 28 August 2012 - 01:48 AM, said:

I have something similar on my alocacia, but it's definitely fungal. I thought it might be mildew, but I'm pretty sure it's systemic: it mainly pops up on the underside along the veins of the plant, so I assume most of the mycewlia are internal.

Does anyone have any suggestions for what it is (sorry, it's not mealybugs) and how to treat the plants? I've no idea what fungicides are used on houseplants (which is slightly embarrassing - for a time I worked on fungicides in agriculture).


Got a picture? For better assessment.
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#9 User is offline   raintree 

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Posted 30 August 2012 - 09:21 PM

Despite spraying the the leaves and their bottom sides drenching wet with sufficiently high ratio of Malathion to water, the leaves of my plant continue to be infested with this disease :

1-

http://i491.photobuc...to/P1100649.jpg

2-

http://i491.photobuc...to/P1100650.jpg

3-
http://i491.photobuc...to/P1100651.jpg


This is how pathetic it looks

http://i491.photobuc...to/P1100652.jpg


compare with this :
http://i491.photobuc...to/P1090381.jpg

Any advice what is wrong. I water once every 2 days and I keep the soil wet practically all the time aa previously advised.
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#10 User is offline   Greyfingers 

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Posted 31 August 2012 - 12:14 PM

Now that is why pictures are so important.

The pictures you have in post #9 shows a heavy infestation of spider mites.

There are many suggestions of dealing with spider mites with different types of oil. Neem oil is one. Start googling.

This post has been edited by Greyfingers: 31 August 2012 - 03:56 PM

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#11 User is offline   raintree 

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Posted 01 September 2012 - 09:45 PM

View PostGreyfingers, on 31 August 2012 - 12:14 PM, said:

Now that is why pictures are so important.

The pictures you have in post #9 shows a heavy infestation of spider mites.

There are many suggestions of dealing with spider mites with different types of oil. Neem oil is one. Start googling.



Is not Malathion good enough ?????

I thought Malathion is a cure all !!!

Anyoe know where NEEM OIL is available ?

I passed a shop yesterday at basement of Century Square where it was selling NEEM products maybe beauty care products. So I suppose NEEM oil is expensive. And how do I use it on the leaves ??????

This post has been edited by raintree: 02 September 2012 - 10:07 PM

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#12 User is offline   raintree 

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Posted 25 November 2012 - 03:51 PM

My Alocasia Cuallata is facing problem Please look ate the pics and kindly advise.

I was told this is a water plant. and should be watered frequently.

As my balcony is breezsy I was advise to keep the soil oist at all time so that the leaf edge will not ywlloe/

Now the leaves becuase of attack by spider mites and meely bugs and after doses of Malathion and White petroleum has Svhrivalled and the size down to of ouf 10 the original size.

On top of that the STEMS have rotted.

Can some kind soul please help and advise.


http://i491.photobuc...to/P1110080.jpg

http://i491.photobuc...to/P1110081.jpg

http://i491.photobuc...to/P1110082.jpg

http://i491.photobuc...to/P1110082.jpg

http://i491.photobuc...to/P1110083.jpg

http://i491.photobuc...to/P1110084.jpg

http://i491.photobuc...to/P1110085.jpg
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#13 User is offline   pino 

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Posted 25 November 2012 - 04:30 PM

too wet, cut away the rotting part, apply fungicide & dry it before planting it again.
make sure the drainage is good when you potted it again.
alocasia prefer rich soil, you make wish to mix ibe with compost & potting mixed.

tks.
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#14 User is offline   pino 

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Posted 25 November 2012 - 04:35 PM

btw your alocasia was infected from spider mites n mealy.
this happened to old leafs.

try to feed your alocasia either with fish emulsion (smelly) or seaweed (expensive) once a week.
pls follow the bottle instruction.

This post has been edited by pino: 25 November 2012 - 04:36 PM

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#15 User is offline   royce 

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Posted 11 July 2017 - 02:39 PM

Should be too much water, the bottom can not have full sunlight, and try to improve.
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