Williamsburg, Va.--Trade publication ad pages for January and February declined 4.16% to 125,338 pages, compared with the same period last year, according to Business Information Network figures released Tuesday at the American Business Press spring meeting in Williamsburg, Va. Ad revenue for the first two months of '99 rose a slight 0.1% to $1.43 billion, compared with the same period last year. The decline in ad pages and the flattening of ad revenue were blamed on computer ads moving to other media, the sluggish agriculture market and a lack of new products in the pharmaceutical industry, according to Gordon Hughes II, ABP president. Meanwhile, additional Business Information Network figures showed ad pages increased 2.4% and ad revenue rose 5.1% in 1998, compared with 1997. The Business Information Network numbers were compiled for ABP by Competitive Media Reporting, New York, and include statistics from Adscope, Agricom and Perq.