Efficacy of Aqueous Extracts from Syzygium aromaticum, Tephrosia vogelii, and Croton dichogamus against Myzus persicae on Brassica oleracea in Northern Tanzania
Table 2
Mean population of M. persicae per crop in response to treatments applied.
Site and treatments
Seasons
2019 wet season
2020 wet season
Site
Tengeru
0.59 ± 0.11a
0.67 ± 0.08a
Boro
0.51 ± 0.08a
0.63 ± 0.09a
Treatments
Water
2.27 ± 0.25a
2.07 ± 0.12a
Water + soap
1.90 ± 0.24ab
2.05 ± 0.09a
Synthetic pesticide
0.21 ± 0.10de
0.11 ± 0.03g
C. dichogamus (1%)
0.64 ± 0.08bc
0.57 ± 0.05bc
C. dichogamus (5%)
0.35 ± 0.03de
0.48 ± 0.03cd
C. dichogamus (10%)
0.39 ± 0.08cde
0.33 ± 0.03efg
S. aromaticum (1%)
0.44 ± 0.04cd
0.79 ± 0.09b
S. aromaticum (5%)
0.32 ± 0.05de
0.51 ± 0.04cd
S. aromaticum (10%)
0.23 ± 0.03de
0.33 ± 0.04efg
T. vogelii (1%)
0.32 ± 0.02de
0.72 ± 0.05b
T. vogelii (5%)
0.21 ± 0.04de
0.44 ± 0.04de
T. vogelii (10%)
0.15 ± 0.02de
0.23 ± 0.02fg
Mixed plants (2.5%)
0.20 ± 0.05de
0.36 ± 0.06def
Mixed plants (5%)
0.12 ± 0.03e
0.16 ± 0.04g
2-way ANOVA
(F-statistics)
Site
2.51 ns
2.47 ns
Treatments
42.19
132.71
Location treatments
1.18 ns
2.18 ns
Each value is a mean ± standard error of eight replicates, ,, and : significant at ,, and , respectively, and ns means not significant. Means within the same column followed by the same letter (s) are insignificantly at from each other using Fisher’s Least significant Difference (LSD) test.
