« on: April 18, 2017, 04:17:37 PM »
gozp, the deficiency your leaves are showing is manganese, not iron. At this time of year these "transient" Manganese deficiency symptoms are VERY common. These transient symptoms are due to a marginal supply of available manganese in the soil, which the tree roots temporarily are unable to extract enough Manganese to supply the large rapidly growing new flush of leaf growth. Normally the leaves will return to the normal dark green color as the grow flush ends, and the roots are able to once again catch up. However, you can apply a manganese spray such as Southern Ag Nutritional spray if you wish, or in most cases simply do nothing. In the rare event that the leaves still look deficient upon the completion of the flush, there is always time to apply manganese.