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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.

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: 447	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.