*3.1. Screening Test*

Significant differences were observed for the number of adult aphids grown on the 14 eggplant CVS examined (F (Fisher: F-distribution) = 3.22; df (degrees of freedom) = 13, 34; *p* < 0.05). The order of eggplant CVS, based on the number of grown aphids, was 'White-Casper', 'Pearl-Round', 'Florida-Market', 'Purple-Violetta', 'Rosa-Bianca', 'Black-Beauty', 'Bianca-Tonda', 'Calliope', 'Purple-Panter', 'White-Eggplant', 'Green-Oblong', 'Ravaya', 'Red-Round' and 'Long-Green' CVS, respectively (Table 1).

**Table 1.** Mean number (±Standard Error (SE)) of *Myzus persicae* on fourteen eggplant cultivars for screening the test in the greenhouse conditions.




Different letters in column indicate significant differences between eggplant cultivars (Tukey's test, *p* < 0.05).

#### *3.2. Antixenosis Test*

Antixenosis data analysis revealed that the number of aphids was significantly affected by tested eggplant CVS within 24, 48, and 72 h (F = 1.21; df = 4, 20; *p* < 0.05), (F = 4.78; df = 4, 20; *p* < 0.05), (F = 6.21; df = 4, 20; *p* < 0.05). After 72 h, the highest number of aphids was recorded on CV. 'White-Casper', while the lowest was on CVS 'Long-Green' and 'Ravaya' (Table 2).

**Table 2.** Mean number ( ± SE) of *Myzus persicae* on five eggplant cultivars for antixenosis test after 24, 48, and 72 h.


Different letters in each column indicate a significant difference between eggplant cultivars (Tukey's test, *p* < 0.05).

## *3.3. Antibiosis Test*

The intrinsic rate of *M. persicae* population increase (r m) values were affected by eggplant CVS (F = 11.07, df = 4,140, *p* < 0.05). The highest r m value was observed on CV. 'White-Casper' (0.384 <sup>d</sup>−1), while the lowest value was on CV. 'Long-Green' (0.265 <sup>d</sup>−1) (Table 3).

**Table 3.** Mean ( ± SE) of intrinsic rate of population increase (r m) and developmental time (d) of *Myzus persicae* on five eggplant cultivars in the greenhouse conditions.


Different letters in each column indicate a significant difference between eggplant cultivars (Tukey's test, *p* < 0.05).

The cultivars also significantly changed the developmental time (d) of the aphid (F = 8.54; df = 4, 140; *p* < 0.05). The lowest and highest amount of developmental time were observed on CVS 'White-Casper' (3.26 d) and 'Long-Green' (4.33 d), respectively (Table 3).

## *3.4. Tolerance Test*

*M. persicae* had significant effects on the decreases in plant height (F = 7.92; df = 4, 20; *p* < 0.05), the fresh weight (F = 3.42; df = 4, 20; *p* < 0.05), and the dry weight (F = 6.52, df = 4, 20; *p* < 0.05) of the aphid-infested CVS examined. The largest reduction percentages in the height and dry weight occurred on CVS 'White-Casper' and 'Pearl-Round', while the lowest reduction percentages for both parameters were seen on CV. 'Long-Green'. Meanwhile, the highest and the lowest reduction percentages were observed on CVS 'White-Casper' and 'Long-Green', respectively (Table 4).

**Table 4.** Mean (± SE) reduction percentage of the growth parameters of five eggplant cultivars against *Myzus persicae* in the greenhouse conditions.


Different letters in each column indicate a significant difference between eggplant cultivars (Tukey's test, *p* < 0.05).

#### *3.5. Plant Resistance Index (PRI)*

The plant resistance index (PRI) of tested eggplant CVS against aphids are shown in Table 5. The greatest PRI value was observed on cv. 'Long-Green' (7.75), followed by 'Ravaya' (3.32). On the contrary, 'White-Casper' was highlighted with the lowest PRI value (1.00) (Table 5).


**Table 5.** Plant Resistance Indices (PRI) related to five eggplant cultivars infested by *Myzus persicae*.
