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Leaf disease help please!


 
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MalcolmMac
Rank attained: Hazel Tree
Rank attained: Hazel Tree


Joined: 15 Jul 2012
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PostPosted: Sun Jul 15, 2012 5:32 pm    Post subject: Leaf disease help please! Reply with quote

I am a novice first of all... most of the shrubs in our garden have become infected with a disease/pest this year which is causing leaf curling and distorting with eventual darkening and withering. I attach some photo's. We are determined to be organic! Any help would be gratefully appreciated. It is breaking our hearts. Among the affected are forsythia, hydrangea, honeysuckle and a number of plants I don't know what they are. (This apart from the black spots and withering on our apple and plum trees and the leaf curling and withering on our pear and black spot rife on all our roese and mildew on our mint...) Aphids infested and appear to have diseased our big honeysuckles as well... Please please please any help or advice. We live in north Louth by the sea.


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A big evergreen tree 15 m high with thick foliage
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Forsythia
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IMG_1190.jpg
 Description:
Shrub/tree with purple flowers
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michael brenock
Rank attained: Chlorophyll for blood


Joined: 12 Aug 2008
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Location: cork

PostPosted: Sun Jul 15, 2012 7:17 pm    Post subject: Reply with quote

I am not quite sure of what is the cause of your problems. The description does not match the pictures completely. I think the damage has been caused by the Capsid Bug, an insect that sucks the sap from the opening buds/developing shoots so that when they open out they are distorted and torn and often turn brown and yellow. The Capsid Bug is like a very large aphid, usually a few occur together and are usually gone by the time the damage is noticed. A spray of very dilute wash-up liquid is a good control. I cannot see any disease present and there is no disease that spans all the species you have mentioned. However the first picture displays symptoms of Iron or Manganese deficiency. If there is poor drainage it is probably Iron. There may be an overall low level of nutrients or the major nutrients have been washed out with all the rain. Sorry I cannot be more definitive. I feel sure there are plenty more out there who have had similar experiences and would be glad to share with you.
michael brenock horticultural advisor (retired)

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