Abstract:The Asian citrus psyllid, Diaphorina citri Kuwayama, transmits pathogenic bacteria that cause the citrus greening disease Huanglongbing . To explore an effective monitoring method, we compared the effects of four yellow sticky traps, two blue sticky traps, and a reflective sheet on the orientation of D. citri adults under artificial sunlight in the laboratory. In addition, the reflectance spectra of each trap and the reflective sheet were measured to examine which wavelengths attract or inhibit D. citri adults. Yellow sticky traps and the reflective sheet showed high reflection around the wavelength 550 nm and attracted D. citri, as well as other psyllid pest species. A combination of a yellow sticky trap and a host plant was more attractive than a yellow sticky trap or a host plant alone. Blue sticky traps that showed high reflection around 450 nm did not attract or inhibit D. citri. Further studies are required to compare these results with field data. To develop more effective sticky traps, the mechanism underlying the attractiveness of the wavelength 550 nm for the psyllid should be investigated.
Cucumber (Cucumis sativus) lines showing resistance to Zucchini yellow mosaic virus (ZYMV) were selected. Two lines (temporarily designated SK-003 and SK-004) showed high resistance to ZYMV, but susceptibility to Papaya ringspot virus (PRSV). SK-003 and SK-004 exhibited a veinal chlorosis on the first and second true leaves when the cotyledon was inoculated with ZYMV. ZYMV was not detected on the fourth leaves, although it was detected from those below the third leaves. A field test confirmed that SK-003 and SK-004 were resistant to ZYMV under natural conditions.
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