Table 1.
The number of points assigned to indicators of the field resistance of carrot cultivars to the hawthorn carrot aphid, Dysaphis crataegi.
Fig 1.
Mean Dysaphis crataegi abundance on carrot genotypes: (A, D) during the aphid migration period), (B, E) throughout the growing season and (C, F) at peak abundance. Means with the same letters on each bar are not significantly different (Duncan’s Multiple Range Test P< 0.05.
Fig 2.
Colonization of carrot plants by Dysaphis crataegi: (A, C) during aphid migration and (B, D) at peak aphid abundance (Chi-square (χ2) test, df = 9).
Fig 3.
Dendrogram showing the clustering of carrot cultivars based on data obtained from field assessments: Mean number of alates (migrants), mean seasonal number of aphids per plant, mean number of aphids per plant at peak abundance, mean percentage of colonized plants during aphid migration, and mean percentage of colonized plants at peak aphid abundance.
Table 2.
Levels of resistance and tolerance of ten carrot cultivars to the hawthorn-carrot aphid, Dysaphis crataegi.
Table 3.
Characteristics of leaf and leaf petiole trichomes of 10 carrot genotypes (one-way ANOVA, factor df = 9, error df = 20).
Table 4.
The contents of sugars in the leaf petiole and root neck apex of the tested carrot genotypes (one-way ANOVA, factor df = 9, error df = 20).
Table 5.
Bionomic and demographic data for Dysaphis crataegi (mean ± SE) on ten carrot cultivars.
Fig 4.
Dendrogram showing the clustering of carrot cultivars based on antibiosis data: Pre-reproductive period (d), reproductive period, fecundity of the female (Md), total progeny, intrinsic rate of increase (rm), mean generation time (T) and net reproduction rate (Ro).
Table 6.
Two-way nested ANOVA for indicators (yield components) of the degree of tolerance to the hawthorn-carrot aphid, Dysaphis crataegi.
Fig 5.
Effects of hawthorn-carrot aphid (Dysaphis crataegi) foraging on the length (A, F), weight (B, G), and contents of sucrose (C, H), reducing sugars (D, I) and carotenoids (E, J) in the roots of the ten tested carrot cultivars. * Significant differences between the control mean and the mean in colonized plants based on the Student’s t test conducted separately for each cultivar (P<0.05).