Just use commercial foliar fertilizer in spring and summer, when they are in active growth.
Or you could give a foliar feed that you spray straight on to the leaves.
Use foliar sprays of liquid seaweed rather than high-nitrogen fertilizers that encourage leafy growth attractive to aphids.
To remedy the problem, use iron chelate, either as a foliar feed or added to the soil.
In the absence of neonicotinoid seed treatments, farmers would have to apply more foliar sprays, more often; is that what environmentalists really want?
Dahlias and many summer-flowering bulbs are heavy feeders and benefit from regular foliar feeding with an organic fertilizer high in potassium and phosphorus.
This flora is preparing for winter the same way deciduous trees do, with a foliar display.
24% liquid Foliar spraying, two times.
In contrast, few species formed foliar symptoms.
The foliar anatomy of Asteraceae was variable.
Canopy thinning increased foliar calcium (Ca) concentration.
