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

Egyptian Journal of Biological Pest Control

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

Tested extracts	2 weeks	4 weeks	6 weeks	8 weeks	10 weeks	12 weeks
Tested extracts	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

The maximum possible index was thus 30 tunnels/tuber, if all tubers fall into the sever category according Fenemore (1980)