Journal of Applied Entomology (2006) 130, 421-425
H. Cerda, A.H. Sayyed and D.J. Wright (2006)
Diamondback moth resistance to Bacillus thuringiensis transgenic canola: evaluation of refugia size with non-recessive resistant insects
Journal of Applied Entomology 130 (8), 421-425
Abstract: Current recommendations to delay the evolution of resistance to Bacillus thuringiensis crops are that a minimum of 5-50% of a crop-growing region should include non-B. thuringiensis varieties as refuges. These recommendations are based in part on the assumption that resistance will be inherited as a recessive trait. Laboratory microcosm experiments are described with transgenic canola expressing Cry1Ac and a non-recessive Cry1Ac resistant population of the diamondback moth Plutella xylostella, in which the effect of different sizes of refugia (0%, 20% and 50%) on resistance was compared over five generations. The LC50 values for Cry1Ac increased markedly in the P. xylostella sub-populations with 0% (>100-fold) and 20% refugia (>35-fold) but showed little change (less than fivefold increase) with 50% refugia. The results support the idea that relatively high levels of refugia (non-B. thuringiensis varieties) may be required where resistance is not functionally recessive at the level of toxin expressed in the B. thuringiensis crop.
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Link to article at publishers website
Database assignments for author(s): Hugo Cerda, Denis J. Wright
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Plutella xylostella | Rape/canola (Brassica napus) | |||
| Bacillus thuringiensis genes in crops (entomopathogen) | Plutella xylostella | Rape/canola (Brassica napus) | ||
| Bacillus thuringiensis Cry1A-toxin (entomopathogen) | Plutella xylostella | Rape/canola (Brassica napus) |
