Simazine Injury on Peach
Return to Abiotic Disorders
Simazine (e.g. Princep) injury causes interveinal and marginal chlorosis (yellowing) of new growth; symptoms can be mistaken for iron deficiency. Damage becomes evident following a spring application that is too high for the soil type or as the result of repeated applications that have built up in the soil. As the herbicide moves into soil around trees, it is taken up by roots. Young trees are particularly susceptible to injury due to their shallow root systems. Damage is more common in soils with low organic matter and in sandy soils.
Simazine herbicide injury.
(Photo: John Strang, University of Kentucky)
Management:
- Avoid repeated applications of high concentrations of simazine.
- Apply lower rates to sandy soils.
