Help please!

Hi everyone

I will appreciate your help and advice to solve this problem. The pictures attached shows seedlings growing indoors since is winter here. They are under 12 hs of direct light in peat, perlite mix.

It starts as a pale spot, like bleached, followed by the leaves tips dry out. They are watered with no fertiliser but a product like superthrive with B1 vitamin that is usually used as antishock.

Thinking this could be a fungal disease, I have sprayed twice with carbendazim 15 days ago and today.

Lamps are two low consumption daylight and are about 5" height above.
Any advice?

Thanks a lot.
Regards, Carlos

 

Carlos,

Pictures of seedlings with spots and the tips shrivelled, just like yours, I can show you hundreds. In fact my problem would be showing pictures of seedlings without those traits.
I do not know what causes it (pathogens?, imbalance between roots and leaves?, ....) and do nothing other than watering when dry weather. Most of them make it ok to the following year when their aspect improves.

Gomero

 

solution with copper and more light..

 

Carlos,
I forgot to ask you if you have measured the pH of the water you use for the maples, if it is hard then you need to correct that. In this link you find advice on that point:

http://www.essenceofthetree.com/articles/growing-japanese-maples-in-hard-water-areas/

Gomero

 

The article would apply more to maples in pots (or as seedlings) than those in the ground, where natural rainfall provides the moisture rather than manual watering. EXCEPT where your plants in the ground never receive any natural rainfall, and are only ever watered manually :)

 

Thank you all for your support!

The water could be the key. It´s the only factor I know that I´m not considering. I use tap water and I don´t know which pH it has.

In the article Gomero gave me, they say that fall color in hard water areas is inconsistent. Why is that? I don´t see the link between both. The amount of pigments is a matter of genetics and its expression in fall a matter of weather. Isn´t it?

Once again, thank you all

Regards Carlos

 

Carlos,

A pH higher than, say, 6-6.5 may result in the maple not being able to use available Fe, Mn and maybe other micronutrients. These deficiencies show up in many different ways, one of them (I am speculating!!) could be poor and inconsistent Fall colours.

Como ha estado el invierno por ahi?

Saludos

Gomero