A new formulation of Pydrin, known as Asana, is available and plants exhibit less injury. Avoid high rates and repeated applications on stressed plants. Fertilizer injury often occurs in the plant bed or with banded fertilizer. Symptoms include marginal foliar burning, yellowing and browning of leaves, browning of roots, and no growth. Avoid overfertilization by following soil and leaf tissue test reports.
Irrigation helps leach excess fertilizer.
Cygon injury is expressed initially as marginal leaf rolling, and later as degrees of flecking on the leaves. There is a rate response. Avoid using on small, unhardened plants. Use the low rate on established plants. Enide injury is fairly common.