Volume 58 Number 4 Article 29
Year 2004 Month 10
Title: Genetic Resistance to Currant Borer in Ribes Cultivars
Authors: K. Hummer and A. Sabitov
Abstract:
The larvae of the currant borer (Synanthedon tipuliformis Clerck), a clearwing moth, are pests of
cultivated black, red, and white currants (Ribes L.) throughout the world.
While broad-spectrum insecticides
are the standard control, more environmentally friendly techniques, such as mating disruption using
synthetic pheromones, can be successful.
Genetic resistance is not extensively reported or employed as
a pest control strategy.
We screened 150 diverse black (Ribes subgenus: Ribes section: Botrycarpum), red
and white currants (Ribes subgenus: Ribes section: Ribes) at the U.S. Department of Agriculture,
Agricultural Research Service, National Clonal Germplasm Repository-Corvallis (NCGR), for natural
infestation by currant borer.
Dependent on stem availability 130 dormant canes (about 20 cm) were
collected.
Canes were cut transversely, and dissected longitudinally.
In highly infested black currant
cultivars, such as R. nigrum L. 'Silvergeters Zwarte,' 2 or 3 larvae were observed within one cane.
The
R. nigrum 'Black Naples' derivatives, 'Saunders' and 'Kerry', had low larval counts, although
'Neosypaushayasya' was highly infested.
Some black currant cultivars from Northern Sweden, Russia,
and England had low counts.
Cane borer larvae were not observed in any of the pink or white flowering
currants, Ribes sanguineum Pursh or in golden currants, R. aureum var. villosa cvs.
Crandall, Idaho or
Gwens.
Red currant hybrid cultivars with a complex pedigree containing R. rubrum with R. multiflorum
Kit. ex Schult. cvs.
Detvan, Mulka, Redstart, Rolan, Rosetta, Rondom, and Rovada, had low larval
counts, although others of similar background, such as 'Blanka', were highly infested.
The infestation
frequency of the samples described a negative exponential function rather than a normal distribution.
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