Mr. President. a witness before Senator WALTER MONDALES Subcommittee on Migratory Labor revealed this morning thatFifty million pounds of a pesticide originally developed in World War II as a German Nerve Gas are being spread unchecked on Americas farms and gardens. The result is that uncounted thousands of the nations migrant farm workers. farmers and suburban homeowners have been fatally overcome or seriously disabled. The testimony of Jerome B. Gordon. president of Delphic Systems & Research Corp.. in New York City. adds a new dimension to the current controversy over the use of persistent. toxic pesticides. Farm workers are daily exposed to hard pesticides at levels believed to be hazardous to human health. yet efforts to protect them are virtually nonexistent.