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Table 2 Mortality percentages of M. incognita J2s as influenced by dry leaves aqueous extracts of selected medicinal plants at different dilutions

From: Screening the nematicidal potential of indigenous medicinal plant extracts against Meloidogyne incognita under lab. and greenhouse conditions

Aqueous extract
(1× stock solution = 25,000 mg D.Wt./L)
aMortality (%) after 48 h Accumulative mortality bToxicity index Lethal Concentrations (mg D.Wt./L)c
Concentration with X dilution and equivalent mg dry weight/L
1:2× 1/:4× 1:8× 1:16× 1:30×
(12500 mg/L) (6250 mg/L) (3120 mg/L) (1560 mg/L) (780 mg/L) LC50 LC90
Basil 100 100 88 62 30 380 0.42 1320 3177
Caraway 100 100 95 81 15 391 0.44 1261 2199
Chamomile 100 100 93 85 9 387 0.41 1340 2263
Common mint 100 100 82 38 17 336 0.29 1884 4322
Coriander 100 100 85 60 12 357 0.31 1759 3140
Dill 100 100 61 36 10 307 0.22 2554 6232
Geranium 100 100 70 37 8 316 0.24 2266 4779
Horsemint 100 98 63 49 13 323 0.28 1996 5091
Marjoram 100 100 100 91 5 396 0.51 1086 1712
Periwinkle 100 100 100 100 73 473 0.75 737 1101
Rosemary 100 100 69 60 36 365 0.40 1372 10774
Solidago 100 100 100 98 72 470 1.0 549 1038
Thyme 100 100 69 54 37 361 0.35 1572 11572
Check (tap water) 9 9 5 7 8   - - -
  1. a\( \mathsf{Mortality}\%=\frac{\mathsf{Number}\ \mathsf{of}\ \mathsf{dead}\ \mathsf{J}\mathsf{2}\ \mathsf{in}\ \mathsf{a}\ \mathsf{treatment}}{\mathsf{Number}\ \mathsf{of}\ \mathsf{totals}\ \mathsf{tested}\ \mathsf{J}\mathsf{2}\ \mathsf{in}\ \mathsf{the}\ \mathsf{same}\ \mathsf{treatment}} \)
  2. b\( \mathsf{Toxicity}\ \mathsf{index}=\frac{\mathsf{LC50}\ \mathsf{of}\ \mathsf{the}\ \mathsf{highest}\ \mathsf{effective}\ \mathsf{extract}}{\mathsf{LC50}\ \mathsf{of}\ \mathsf{each}\ \mathsf{extract}} \)
  3. cmg D.Wt./L= milligram dry leaves per liter