The investigation of resistance of some canola cultivars to Myzus persicae Sulzar under the field and greenhouse conditions in Ardabil region.

مريم, صداقتي (2009) The investigation of resistance of some canola cultivars to Myzus persicae Sulzar under the field and greenhouse conditions in Ardabil region. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

:The green peach aphid, Myzus persicae Sulzar, is a pest of canola throughout Iran. In this research, the resistance of 19 canola cultivars produced by the Seed and Plant Improvement Institute of Karaj in Iran, were evaluated to the green peach aphid under field and greenhouse conditions in 2008. Under the field conditions with natural infestation, the number of aphids per leaf was used as the comparison index. The results showed that there was significant difference among these cultivars in aphid population (P<0.001). Opera and Zarfam cultivars had the lowest and highest number of aphids per leaf, respectively. Based on the results obtained in the field experiments, five cultivars with lower aphid population along with Zarfam as the control were selected for greenhouse studies. Antixenosis experiments in the greenhouse were carried out by counting the number of aphids attracted on each cultivar and the results showed that there were significant differences (P<0.001) among cultivars with respect to the number of attracted aphids. The highest and the lowest aphids were attracted to Zarfam and Elite cultivars, respectively. The population growth parameters were used, to delineate the antibiosis effects of the cultivars. The results of antibiosis experiments indicated that different canola cultivars have different effects on the biology and population parameters of the green peach aphid. The longest developmental time (8.67 days), the lowest fecundity rate (15.40 nymphs/female) and the lowest daily reproduction rate (2.53 nymphs) were obtained on the cultivar Opera. Among the six canola cultivars the highest (rm = 0.307) and lowest (rm = 0.193) amount of intrinsic rate of natural increase were obtained on Zarfam and Opera, respectively. In tested cultivars the mean generation time (T) was 11.70-13.05 day, gross reproductive rate (GRR) was 20.85-48.68, net reproductive rate (R0) was 9/62-42/58, finite rate of increase (λ) was 1.21-1.35, doubling time (DT) was 2.25-3.58 day, intrinsic rate of birth (b) was 0.25-0.32 and intrinsic rate of death (d) was 0.001-0.06. The results indicated that among the cultivars studied Opera is relatively resistant and Zarfam is susceptible to the green peach aphid.

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