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Table 2 Continuity of extracts in preventing the stored tubers from PTM infestation during different periods

From: Botanical extracts against the potato tuber moth, Phthorimaea operculella (Zeller 1873) (Lepidoptera: Gelechiidae), during storage conditions

Tested extracts 2 weeks 4 weeks 6 weeks 8 weeks 10 weeks 12 weeks
Mean ± SE
Mint 0 f 0 f 0 f 1.80 ± 0.68 f g 4.70 ± 1.80 g 5.33 ± 1.60 h
Coriander 0 f 0 f 0 f 3.70 ± 0.0.29 f 4.30 ± 0.14 g 4.45 ± 0.18 h
Zygophyllum 0 f 0 f 0 f 3.17 ± 1.80 f 3.44 ± 0.27 g 4.11 ± 0.46 h
Arnoglosse 4.67 ± 0.33 e 6.33 ± 0.67 e 7.33 ± 1.45 e 7.33 ± 1.45 e 8.53 ± 1.99 f 9.66 ± 1.60 f
Harmel 0 f 0 f 0 f 3.97 ± 0.70 f 4.70 ± 0.79 g 5.52 ± 0.60 h
Solanum 0 f 0 f 0 f 0 g 6.50 ± 0.40f g 6.70 ± 0.32 gh
Basil 5.93 ± 0.37 e 6.73 ± 0.27 e 6.73 ± 0.27 e 8.17 ± 0.99 e 8.93 ± 0.68 f 9.04 ± 0.76 fg
Colocynth 12.00 ± 1.15 d 13.00 ± 1.53 d 13.33 ± 1.67 d 13.33 ± 1.67 d 14.80 ± 2.50 e 15.74 ± 1.58 e
Jasmine 17.67 ± 0.33 c 18.30 ± 0.33 c 18.66 ± 0.33 c 19.56 ± 0.64 c 19.70 ± 0.61d 19.70 ± 0.60 d
Geranium 18.67 ± 0.33 c 19.67 ± 0.33 c 20.00 ± 0.00 c 20.86 ± 0.86 c 21.78 ± 0.89 cd 22.44 ± 0.22 c
Senna 22.33 ± 0.88 b 23.00 ± 1.16 b 23.67 ± 0.67 b 23.67 ± 0.67 b 24.03 ± 0.49 bc 24.03 ± 0.48 bc
Chamomile 23.05 ± 0.76 b 24.17 ± 1.01 b 25.10 ± 0.59 b 25.10 ± 0.59 b 25.43 ± 0.72 b 25.53 ± 0.62 b
Talcum powder 28.00 ± 0.33 a 28.36 ± 0.33 a 29.33 ± 0.30 a 29.77 ± 0.23 a 29.77 ± 0.23 a 29.40 ± 0.29 a
Control 30.00 ± 0.00 a 30.00 ± 0.00 a 30.00 ± 0.00 a 30.00 ± 0.00 a 30.00 ± 0.00 a 30.00 ± 0.00 a
LSD 0.05 1.79 2.33 2.42 2.33 3.19 2.49
LSD 0.01 2.46 3.19 3.32 3.24 4.31 3.34
  1. The maximum possible index was thus 30 tunnels/tuber, if all tubers fall into the sever category according Fenemore (1980)