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Chinese Elm Black Spot.

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Chinese Elm Black Spot.

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23-Aug-2004	#1
Camay123 Life Student Join Date: Aug-2002 Location: Gatineau Country: Canada USDA Zone: 5a AHS Heat Zone: 2-3 Posts: 673	Chinese Elm Black Spot. Ok. Im a bit in panic here. I got this nice promising chinese elm. The thing is, black spot is reccurent on this tree. It's the third time this summer it has black spot on leaf. Now it's loosing all of it's leaves. So far, I have tried : Defoliating the tree and spraying with fungicide. Water less frequently in order to let the soil dry. Giving it fertilizer, even tought im in summer. I have to admit, the soil is poor draining soil. Just regular garden soil. It's scheduled to be repotted next spring. Any toughts ? Thanks in advance Patrick

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23-Aug-2004	#2
ALDEVAUX bonsaiTALK Master Join Date: Mar-2004 Location: St-Hyacinthe, P.Québec Country: CANADA USDA Zone: 4 AHS Heat Zone: ? Posts: 442	Look at the reference I gave on this thread ;http://www.oznet.ksu.edu/path-ext/f...Elm%20Trees.asp Make sure you begin the first fungicide treatment in the spring, at bud break, and continue every week for at least four weeks when the leaves are fully developped. Make sure also that you put the recommended dosage (no more no less) than what is given on the label of the fungicide and that every part of the plant is ciovered by the spray. Best of luck.

23-Aug-2004	#3
Camay123 Life Student Join Date: Aug-2002 Location: Gatineau Country: Canada USDA Zone: 5a AHS Heat Zone: 2-3 Posts: 673	Thanks Aldevaux. I got one more question to everybody with knowledge of black spot on elm, can my tree die from this ?

24-Aug-2004	#4
ALDEVAUX bonsaiTALK Master Join Date: Mar-2004 Location: St-Hyacinthe, P.Québec Country: CANADA USDA Zone: 4 AHS Heat Zone: ? Posts: 442	It depends on the condition of the tree. If it is very vigorous, it will produce new growth which should be protected with a fungicide as it develops. So, as long as there is new growth starting there is hope. Chinese elm (Ulmus parviflora) is a semi-deciduous tree that would really prefer a dormant period over the winter. It would be a good recommendation that you start giving this tree a dormant period as soon as possible, and after this period, protect the new growth at time of budding. Remove any leaves which are more than half damaged. Keep the bonsai in very good air circulation , and do not mist. Later, as your bonsai grows, it will naturally shed some leaves. Always remove dead leaves from the tree and from the top soil, and it's a good idea to gently shower down the foliage once a week as it helps discourage diseases and other pests.

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