CURRENT volunteers' news and needs:
Baltimore County Conservancy Board, working in conjunction with the State Tree-Mendous program, will be planting trees throughout April in parks, sides of roads and in the waste water treatment plant area in Back River. Volunteer help is greatly needed. Call Bob Christopher, 687-4011.
Mount Clare Mansion Museum in Carroll Park needs volunteers for many areas of help. Call 837-3262.
The League for Handicapped Inc. on Cold Spring Lane wants volunteers for a new Information and Referral Service geared to help the handicapped. Training will be provided. For details, call Erma Freburger, 323-0500.
S.P.C.A. of Anne Arundel County will hold a volunteer orientation at 7:30 p.m. April 10 at the shelter, 1815 Bay Ridge Ave. in Annapolis. Details: 268-2659.
Harford Hospice in Aberdeen needs volunteers for the Spring Home Care Volunteer Training Program, which will begin April 9 to help the terminally ill patient and family. For details, call Mary Jane Figinski, 1-272-2266.
Central Maryland Red Cross offers free, confidential and anonymous AIDS testing and counseling at its new headquarters, 4700 Mt. Hope Drive in the Seton Business Park, Northwest Baltimore. Call between 8:30 a.m. and 4:30 p.m. for an appointment and details, 764-7000.
BARC, Baltimore Association for Retarded Citizens Inc., wants volunteer tutors, advocates and friends with developmental disabilities. Call 323-5600.
Volunteer Clearinghouse program of Jewish Vocational Service wants volunteers to teach Russian immigrants conversational English. Hours are flexible and knowledge of Russian is not required. Call Dana Brecher, 466-3300.
Cooperative Extension Service, University of Maryland System, deserves congratulations. In 1990, some 924 volunteers gave 13,384 hours. They and the staff assisted in the development of 14 new community gardens for low-income residents and worked with 64 people; its 4-H program involves more than 3,000 youth with pilot programs ''Adventures in Science'' and ''Learn and Earn,'' as a model for the state; a new Family Community Leadership Program taught 106 citizens public policy leadership skills and 1,068 low-income families were helped in the intensive nutrition education program with another 1,600 attending classes in food and nutrition. To volunteer, call Margaret Metz Altman, 396-1753.