Host plant resistance to the Diaprepes root weevil, Diaprepes abbreviatus (L.) was assessed for seedlings of 54 Poncirus trifoliata (L.) Raf. selections and two families of progeny from crosses between Citrus and P. trifoliata. Weight gain was consistently lower when larvae were reared in pots containing the progeny of Citrus reticulata Blanco ÔSunkiÕ x P. trifoliata ÔFlying DragonÕ compared with larvae reared on progeny of ÔPearlÕ (C. reticulata x C. paradisi Macf.) x ÔFlying DragonÕ. This is

more »

... he Þrst evidence of genetic control of resistance to the Diaprepes root weevil within sexually compatible citrus rootstock germplasm. There was a signiÞcant positive correlation between percentage root loss and larval weight gain within the resistant progeny, indicating a possible antixenotic effect. Two varieties of P. trifoliata were identiÞed as more resistant than ÔFlying DragonÕ based on larval weight gain.