Our Insights | Crop Protection
July 19, 2019

Adding Boron to Fungicide Applications

Approximately 50% of tissue tests on corn in Midwest this year are coming back low in boron.  This is not surprising given the abundant amount of rain fall this year. Low boron levels and availability impedes the crops ability to transport boron weakening the structure of pectin, which is a fiber that the plant needs to remain physically stable.  When this happens the growing points in the plant that contain meristems abort which has a negative impact on tassel, silk and kernel development.


In high yield situations, boron fertilization becomes critically important. In severe boron deficiencies pollination issues arise from poor and delayed tassel development and reduced pollen viability. Although a more common scenario is where insufficient boron availability between R2 (blister stage) to the R4 (dough stage) affects kernel development as it is important in the migration and metabolism carbohydrate, facilitating the transport of sugars through membranes.


If you have low boron levels adding boron to your fungicide applications is beneficial. We’ve seen the best results 1 to 2 pts/acre of BRANDT® Smart B-Mo applied with fungicide.

Severe boron deficiency resulting in poor kernel development

View our 2018 BRANDT Research Farm Data

Severe boron deficiency can cause delayed and poor development of tassels