sentences:  For soybeans, neonicotinoid seed treatments typically are not effective against the soybean aphid, because the compounds break down 35–42 days after planting, and soybean aphids typically are not present or at damaging population levels before this time.Neonicotinoid seed treatments can protect yield in individual cases such as late-planted fields or in areas with large infestations much earlier in the growing season.Overall yield gains are not expected from neonicotinoid seed treatments for soybean insect pests in the United States, and foliar insecticides are recommended instead when insects do reach damaging levels.