[word=psyllids] | □ □ □
[word=psyllids] | [□] □ □
[word=psyllids] | [] □ □
If you have a black or Manchurian ash that has been attacked by psyllids remember it is important to keep the tree healthy , especially by keeping it well-watered . If you are still concerned about its health , you might consider protecting your tree from psyllids with an insecticide spray . Also cottony ash psyllids are not known to attack green ash which is the tree most commonly attacked by ash leaf curl aphids . He believes the wasps feed only on lerp psyllids , but says it remains to be proven that they wo n't pose a danger to other insects . The second generation nymphs feed inside leaflets damaged by the first generation psyllids as well as along the midrib of unaffected leaflets .