Citrus > Citrus General Discussion

What can it be?

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mikkel:
What kind of disease could this be? They wilt from top to bottom but roots mostly survive. After some time some sprout again from roots.

kranke zitrus 2 by hebamme.lena, on Flickr

citrange:
I think it is probably Botrytis. A fungal disease that thrives in cool, humid conditions. You should try and reduce humidity.
At the first signs of this you should cut off and remove all infected leaves and stems.
Separating seedlings earlier will improve air flow and reduce the risk of spreading the problem.

mikkel:
thanks! yes it is cool and humid since weeks. is there a first aid to treat it e.g. coppersulfite ?

Sylvain:
Yes, Botrytis cinerea.

citrange:
The following advice about botrytis is from the RHS and applies to home gardeners in the UK. Regulations may be different for Germany and elsewhere.
Non-chemical control
Hygiene is very important, especially under glass. Remove dead and dying leaves, buds and flowers promptly
Do not leave dead plant material lying around
Reduce humidity by improving ventilation and do not overcrowd plants
Chemical control
No fungicides are approved for use against grey mould by gardeners.

See https://www.rhs.org.uk/advice/profile?PID=165

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