Defense planning is under way across the country. No-tillers are taking aim at the weeds, insects and diseases that could threaten their soybean crops in 2004. And as the threats to soybeans change - aphids have become a bigger problem in the past couple of years, and fast-acting rust disease seems ready to move into the U.S. from South America - the country's pesticide manufacturers are offering some new alternatives on top of proven performers to guard the fields.