Affected almond scions on the plum rootstock, Mariana 2624', declined rapidly and died. However, a few affected trees died. A third disorder was first observed on second-leaf trees of Padre almond on Hansen rootstock with interstems of Livingston or Butte . At the third-leaf growth stage, all tree rows of Butte almond on Hansen root exhibited similar symptoms, except that no trees had succumbed. In previous assays for viruses and phytoplasmas, affected Padre trees were negative, as were graft-inoculations and propagations on almond indicator trees.
Investigations are ongoing.
A fourth disorder affected a few trees of Padre almond on peach rootstock and exhibited yellow canopy, robust vegetative vigor, and reduced nut set.