I presume they are in pots in the greenhouse. If it is affecting the plant growth, spray with a suitable fungicide.

Just out of interest, what sort of plants Dickiebird?

As Dickiebird can see the roots I wondered about orchids. In this case the white filaments could be fungus coming from the wood chips?

If it is the white mycelium sometimes found in potted plants, and indeed in the garden especially under mulching materials, then that type of fungal growth is very beneficial to root development

I agree with bs, many plants benefit from this fungal association, but it is only in recent years that the significance of this has been proven.

they could of course be the fine adventitious roots , what palnts are you talking about.

I was thinking of both possibilities too, I was just waiting for the reply :-)

yes what plant are we talking about. any chance of a photo, I am curious now. wonder if i was a cat in a previous life and still got the curiosity gene? :o)))

s and that some of these firms used unsterilised compost. Could you tell me what this could be, and is there a solution to this problem without me having to get rid of all the soil.
thanks dickiebird.

I dont think you need to worry dickiebird. which plants are affected and are they actually suffering?

Thanks for your concern unfortunately I still dont know what to do with the soil in the garden and the green house,I may have the same problem this season. The compost was bought from a reputable company,and some horse manure was used,I did wonder if the compost was contaminated,causing all the produce to be stunted in growth and tomatoe plants in the green house rotting on the vine ,in some cases the truss itself went brown and rotted.When I lifted the roots there was a white filament running through.I discussed this prblem to a keen gardener who said that he had heard of this before and that he thought it was called (honey funges). Is there anything i can do to save the soil.
Thank you.

you used horse manure then i suspect it will be a harmless fungus. I used horse manure 10 yrs ago and got a fantastic crop of mushrooms from it. All healthy soil has fungus in it do not worry. There are a range of tomato diseases that fit your description, the most obvious one being blight. for soil in the greenhouse you could dig it out and replace it. soil in the garden will be ok just grow blight susceptible crops in it for about 3 - 4 years. the stunting may have been due to the contamination of a herbicide. cant remember which, but it was well publisiced last year.

honey fungus usually is visible as toadstools on stem/trunks of trees and shrubs in the autumn. there are several species too. some are active killers and others move in on dying and dead wood. without it many plants would not rot away naturally.
I have hf in one place in the garden, it isnt practicable to change the soil. so i plant resistant species. the one i have doesnt have the traditional black bootlace structures that the more 'nasty' ones have.

thanks i will dig out the greenhouse and apply jeyes fluid before filling with new compost.in the garden i will hope for the best.
dickiebird

sounds good to me .

thanks again,ihave access to fresh seaweed which i am thinking of incorperating into my veg beds do you think this is agood idea

yes its a rich source of many trace elements.

thanks again

thanks for all your responses ,i have dug out the greenhouse to a depth of 1 foot I intend to apply jeyes fluid to the remaining soil in mid february and after a further month refill.I am tempted to use a mixture of peat and comercial garden compost.If you can think of a better growing medium please advise.
dickiebird