Is there an organic method to control psyllids in Photinias?

not sure what you are asking,but if it a insect spray the plants down with a horticultural soap.

The treatment is the same for all plantshort of getting rid of it to stop infestation/

Psyllid control recommend is a wide range of chemical sprays, monitoring and beating of the bushes, but in practice, psyllids on most plants can be ignored so long as you put the broad-spectrum insecticides away and allow beneficial insects to feed in your garden. When damage becomes unbearable, weekly sprays of neem oil or insecticidal soap will kill most psyllids. Don’t try to prune psyllids out, they’re very mobile and will just jump away. Make sure that psyllids are still feeding on your plants before you attempt treatment. Often, by the time that damage is obvious, the psyllids have been destroyed by natural agents. If you carefully monitor your plants daily, you’ll know if these pests are still active. Although neem oil and insecticidal soap are relatively safe for beneficial insects, spraying them when there are no insects to control is a waste of money.