HETEROPSYLLA-CUBANA CRAWFORD (PSYLLIDAE) AND COCCUS-LONGULUS (DOUGLAS) (COCCIDAE) INFESTATIONS ON LEUCAENA SPECIES AND HYBRIDS IN COASTAL CENTRAL QUEENSLAND

Leucaena psyllid, Heteropsylla cubana, and long soft scale, Coccus lon gulus, populations were examined in 1993 and 1996 on nine Leucaena acc essions grown at Raglan in coastal central Queensland. Accessions incl uded live of Leucaena leucocephala, two of Leucaena diversifolia (a di ploid and a tetraploid), and two hybrids (L. leucocephala x leukocepha la pallida and L. leucaena x L. diversifolia). The five L. leukocephal a accessions had higher nymphal psyllid infestations than the two L. d iversifolia accessions or the two hybrids. Scale numbers were highest on L. leukocephala (cultivar Tarramba), the tetraploid L. diversifolia and the two hybrids. Lowest scale counts were recorded on the diploid L. diversifolia and three lines of L. leukocephala (CPI 61222, Q25221 and cultivar Cunningham). Plant breeders should consider both insects when selecting parent lines.