Iris yellow spot (IYS) disease in onion (Allium cepa L.) is caused by thrips (Thrips tabaci vectored virus (IYSV). The absence of cultivars that are resistant/tolerant to and/or IYS a challenge for bulb and seed production worldwide. To measure selection progress reduced/delayed symptom expression breeding lines after two cycles, selections were performed 2011 on previously evaluated exhibited ...

A total of 53 strains of onion thrips, Thrips tabaci Lindeman, were established, of which 14 strains were collected from persimmon fruit and 39 strains from a vetch weed, Vicia angustifolia, in commercial persimmon orchards in Wakayama Prefecture. Susceptibility to insecticides was evaluated by the Petri dish-spraying tower method. Pyrethroid-resistant strains and pyrethroid-susceptible strains...