<![CDATA[Utilization of the resistance of some Leucaena cultivar of leucaena psyllids (Heteropsylla cubana). The degree of resistance was determined based on the level of plant damage after a certain time of exposure to the psyllids and can be classified into three groups based on their levels of damages. They were : resistant (scale of 1 - 3) level of damage did not exceed curling of levels; tolerant (scale of 4 - 6) level of damage did not exceed 25% of leaf fall and susceptible (scale of 7 - 9) level damage exceed 75% of leaf fall. Only one cultivar was highly resistant that was L. diversifolia at the field station.   There were positive corelations between psyllid counts correlated with the levels of damage. Nymphs of psyllid appeared to be the main cause of damage. Within the Leucaena genus L. diversifolia, Leucaena cv. Tarramba and Leucaena KX2 were psyllid-resistant and showing comparable agronomic performance to L. leucocephala as alternative of forage availability for animal production. (Animal Production 8(2): 143-151 (2006) Key Words : Leucaena, resistant cultivars, Heteropsylla cubana]]>
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