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• Two European leaf feeders, the jumping plant louse Psylla ulmi and the aphid Tinocallis platani,. are both normally restricted to Ulmus laevis.
• However, since then devastating effects of the leucaena psyllid , a tiny jumping plant louse, have been experienced in many areas where leucaena is grown.
• For instance, the psyllids, also known as jumping plant lice, contain compartments in their cells that can be recognized as Proteobacteria from the DNA they contain.