The World Leader In Plant Pathogen Test Kits. In 1976 Alister Voller, Mike Clark, and associates reported the successful and sensitive detection of plant viruses by ELISA. Two years earlier, Voller , Engvall, Bidwell and Huldt developed the microwell ELISA plate. This technology arrived just in time to test and select plants grown by tissue culture and to assist clean plant programs using one-way pass-through propagation methods. The rapid exploration and acceptance of ELISA created an immediate need for optimized, validated tests, for kits, for quality controlled antibodies, enzyme conjugates and accessories. Agdia, Inc. was formed to meet this need.