{Pinus spp.}

Boron Deficiency in Pines

Most species of pine exhibit similar symptoms of boron deficiency including:

  • The cessation of growth of the main leader
  • Terminal dieback is associated in some species with resin exudation
  • Crooked leader growth has been reported in several species of pine

The most characteristic symptom is the cessation of apical growth and the repeated death of the leading shoot. In P. radiata and P. taeda the growing points may become necrotic and the stem apex swell. Young needles adjacent to the apical bud may die and resin exude from the bud. In these two species, the juvenile needles may be bluish-green color and the mature needles show a tendency to fuse.

Crooked leader growth has been especially reported on P. caribaea, P. khasya, and P. patula. P. khasya and P. patula seem less susceptible to boron deficiency than P. radiata and P. caribaea. In P. strobus the primary needles become light blue-green, with yellow/orange tips.

Calculate Your ROI

Soil Application (Suggested rates of application)

  Granubor Fertibor
LBS/ACRE 6.3-31.2 6.3-31.2
KG/HA 7.09 - 35.10 7.09 - 35.10

Foliar Application (Suggested rates of application)

LBS/ACRE 4.5 - 22.3
KG/HA 2.04 - 10.12
Value in Use
Current Yield (Per Acre)
Expected Sale Price

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. We are 1,000 people serving 650 customers with more than 1,800 delivery locations globally. We supply around 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles. Learn more about Rio Tinto.

Copyright © 2024 Rio Tinto. All Rights Reserved.