Investigation on resistance of 48 rapeseed Brassica napus L. genotypes to cabbage aphid Brevicoryne brassicae L.
Subject Areas : entomology and othea arthropods
A.
Mohiseni
1
(Agricultural and Natural resources Research Centre of Lorestan- Borujerd Station, Borujerd, Iran)
A.
Torkamani Pirmishani
2
(Agricultural and Natural resources Research Centre of Lorestan- Borujerd Station, Borujerd, Iran)
Keywords:
Abstract :
The cabbage aphid, Brevicoryne brassicae (L.), has been remained one of the most important pests of horticultural and oil-seed Brassica crops, despite all attempts to control its infestation. This research was conducted to evaluate the resistance of 48 rapeseed (Brassica napusL.) genotypes to cabbage aphid, Brevicoryne brassicae (L.) at Borujerd agricultural research station, Iran. during 2001-2003. In the first year, out of 48 genotrypes 8 showed a moderately resistance in comparison to rest. In the second year these 8 geotypes and a susceptible one (VDH8003/98) were evaluated in the field and laboratory condition. In the field condition, two similar but separated trials (treatment with insecticide and no treatment) were done in a randomized complete block design with four replications. Results showed that the most and the least infestation index and rm (intrinsic rate of natural increase) belonged to VDH 8003/98 and PF7045/91 respectively. Based on the field and laboratory investigations, among 48 genotypes, the most susceptible was VDH 8003/98 and the most resistant one was PF7045/91 and the other varieties were placed between these two.