抄録
The Asian citrus psyllid, Diaphorina citri Kuwayama causes citrus greening disease. Investigation of psyllid invasion in citrus trees is crucial for the management of this disease occurrence. Toward the end of January 2006, young trees of Citrus tankan were placed in a fallow land in a residential area of Uken Village, Kagoshima Prefecture, Japan. The field was surrounded by orange jasmine hedges on 3 sides. The psyllid first invaded the tankan trees just after the orange jasmines shooted in mid-February. Thereafter, they continuously invaded the citrus trees; however, the number of invading adults did not increase proportionately with the number of new tankan shoots. The psyllids found on the tankan trees were mainly females; most of them had copulated and had matured eggs, suggesting that they can immediately reproduce after invading the citrus trees. These results suggest that the psyllids on orange jasmines are important targets for disease control and that orange jasmines should be removed from the vicinity to impede psyllid invasion into citrus groves.
