Regularity of Aphid Occurrence and Screening of Aphid Resistant Germplasm in Brassica napus
In order to understand the aphid resistance of rapeseed and screen aphid resistant germplasm resources to provide parents for rapeseed breeding of aphid resistance,18 rapeseed cultivars were identified by aphid index under the condition of natural aphid sensitivity in Luoping and Luxi of Yunnan,and the occurrence rule of aphid and its effect on yield were analyzed.The results showed that the peak period of aphids occurred between flowering and maturity,and the mild and dry climate was conducive to the growth and reproduction of aphids.The peak period in Luxi was earlier than Luoping.Correlation analysis showed that the aphid index was negatively correlated with rape yield and its components,and was significantly correlated with 1000-grain weight and yield per plant.The occurrence of aphid damage would cause 4.97％-79.69％yield loss of rapeseed.5 aphid resistant cultivars and 13 aphid sensitive cultivars were selected from 18 cultivars.'Yunyouza 28'and'Yunyouza 18'showed high resistance,which could be used as basic materials for rapeseed aphid resistance breeding.
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