Macropterous female brown planthoppers, 400–800
per site, were collected from farmers’ fields at four
sites in Central Luzon, Philippines, on August 28–29,
1995. The four sites (San Roque, Guimba; Sto. Rosario,
Sto. Domingo; La Torre, Talavera; and Sta. Lucia,
Zaragosa) are separated from each other by 13–20 km.
The rice cultivars on which the N. lugens were collected
were: IR64 (San Roque and Sto. Rosario), PSBRc10
(Sta. Lucia), and IR64 and IR841 (La Torre). The rice
fields at each site had been transplanted from 21 to
35 days prior to the brown planthopper collections.
Because the N. lugens populations in the fields consisted
almost entirely of macropterous females, those
collected were probably first generation immigrants.