The effect of different rose varieties on reproductive parameters of rose aphid

The rose aphid, scientifically known as Macrosiphum rosae (L.), is considered the most important rose pest. This pest settles on buds and branches and, by feeding on plant sap, prevents the leaves and buds from opening, which ultimately leads to the weakness of the roses. In order to introduce varieties that are relatively sensitive and resistant to infestations of this aphid, its reproductive parameters were studied on 10 different rose cultivars in 2010 at the University of Mohaghegh Ardabili. The experiment was conducted in a growth chamber under laboratory conditions, with a temperature of 1±24°C, a relative humidity of 5±65%, and a photoperiod of 16 hours of light and 8 hours of darkness. Leaf racks installed on the plants were used to conduct the experiment and measure the duration of the aphid development, survival, and fecundity period. The results showed that different host plant cultivars had a significant effect on the reproductive indices of rose aphids. The gross aphid fecundity rate on rose cultivars was significantly different, with the highest value of this parameter being 2.43±40.49 nymphs on Orange cultivar and the lowest value being 0.94±17.13 nymphs on Tea cultivar. The lowest net fecundity rate was calculated on Tea cultivar (0.50±66.6 nymphs) and the highest value was calculated on Coolwater cultivars (1.28±26.30 nymphs) and Orange (0.98±38.29 nymphs). Also, the lowest value of the parameter of the number of nymphs per adult aphid per day was recorded on the Tea cultivar (0.04±54 nymphs). The findings of this study, by introducing the Tea cultivar as a relatively resistant rose cultivar, can be used in better control of rose aphids in the form of integrated management