Tree is covered with buds in early spring when I use dormant oil before they open and any sign of the pink flower and on the trunk as well. I spray the trunk only once on another occasion, You can see that there is minimal blossoming and the remainder dry up. Some branches will partially dry when I cut back to green. The tree grows throughout the season and looks great with no further sign of any damage. Would appreciate your advice
Thanks
Hello – I’m sorry to hear your flowering almond is not putting on a good show of blossom this year. There are a number of things that could be causing the lack of bloom. As you know, the timing of the use of dormant oil is very critical. I’ve included below a link to information from the Chicago Botanical Garden on the use of dormant oil which notes that the tree must be truly dormant before spraying to prevent damage to the buds. In Ontario, this could be anytime from late winter till 2 weeks before bud break. Was the timing right when you sprayed? The article points out other conditions that must be met to ensure the effectiveness of the oil.
Have you seen any evidence of insects on your tree? Dormant oil is effective in controlling aphids which become active in late spring. If the timing of your spraying was not optimal, they may be present and can cause blossom damage. A lighter oil called horticultural or summer oil can be used during the growing season to deal with aphids and the other pests.
Some experts suggest that a light pruning will promote better flowering. Certainly removing any dead twigs and select live ones to improve air circulation will contribute to the overall health of your tree as well as maintaining an attractive shape. Wait till after all bloom has finished before undertaking any pruning and take care to not remove more than a third of the old wood.
I hope you’ll see better bloom next year.
SprayingTrees With Dormant Oil