Response of citrus rootstock seedlings to Diaprepes abbreviatus l. (coleoptera: curculionidae) larval feeding

H. N. Nigg, S. E. Simpson, N. E. El-Ghol, F. G. Gmitter, Jr

Abstract


Cleopatra Mandarin, Kinkoji, Red Rough Lemon, Sun- ChuSha, Sweet Lime, Swingle, and Vangasay Lemon rootstock seedlings were challenged with 20 neonate Diaprepes abbreviatus larvae every 30 days for 168 days. At 90 days, Cleopatra Mandarin, SunChuSha, and Sweet Lime appeared tolerant of D. abbreviatus larval feeding. At 168 days, none of the tested rootstocks were tolerant of D. abbreviatus larval feeding. More larvae were recovered from inoculated trees at 90 days compared to 168 days. No larvae were recovered from Cleopatra Mandarin seedlings at 168 days. Pathogens recovered from citrus roots were overwhelmingly Fusarium spp.; Fusarium moniliforme is a new record for citrus. Based on these and previous data, the control of adult D. abbreviatus to reduce larval pressure to tolerated levels appears to be a management option in D. abbreviatus-infested citrus groves.

Keywords


root damage; resistance; fusarium solani

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283