Table 1
In vitro assay for the comparison of spirotetramat and fluensulfone on the mobility of Meloidogyne incognita and Mesocriconema xenoplax.
| M. xenoplax | M. incognita | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % Motile nematodesa | % Motile J2 | |||||||||||
| Assay 1 | Assay 2 | Assay 1 | Assay 2 | |||||||||
| Treatment | 24 hrs | 48 hrs | 72 hrs | 24 hrs | 48 hrs | 72 hrs | 24 hrs | 48 hrs | 72 hrs | 24 hrs | 48 hrs | 72 hrs |
| Untreated control | 52.9 ab | 48.9 a | 60.1 a | 56.9 a | 44.8 a | 56.2 a | 94.0 a | 90.9 a | 94.7 a | 98.8 a | 99.3 a | 99.5 a |
| Spirotetramat at 0.017 kg a.i./ha | 36.3 b | 32.1 b | 43.3 b | 47.8 b | 30.5 b | 35.3 b | 94.8 a | 94.0 a | 96.5 a | 98.1 a | 98.5 a | 99.7 a |
| Spirotetramat at 0.026 kg a.i./ha | 33.2 b | 24.7 b | 34.0 b | 32.4 c | 32.1 b | 32.4 b | 93.0 a | 93.9 a | 91.6 a | 98.7 a | 98.4 a | 99.7 a |
| Fluensulfone at 3.92 kg a.i./ha | 17.1 c | 8.05 c | 4.79 c | 28.9 c | 25.5 b | 19.2 c | 48.2 b | 46.2 b | 11.0 b | 65.6 b | 8.56 b | 2.23 b |
Table 2
Effect of spirotetramat, on population densities of Meloidogyne incognita infecting ‘Lovell’ peach under greenhouse conditions 40 and 70 days after inoculation (DAI).
| 40 DAI | 70 DAI | 70 DAI | 70 DAI | |||||
|---|---|---|---|---|---|---|---|---|
| Treatment | RKN/100 cm3 soila | RKN/potb | RKN/g dry rootc | Rfd | ||||
| Untreated control | 1,162 | ae | 70,250 | a | 13,147 | a | 3.44 | a |
| Adjuvant as control | 1,004 | a | 50,966 | a | 11,253 | a | 2.48 | a |
| Spirotetramat at 0026 kg a.i./ha | 665 | ab | 51,101 | a | 7,173 | a | 2.48 | a |
| Spirotetramat at 0.017 kg a.i./ha | 443 | b | 32,729 | a | 5,862 | a | 1.56 | a |
1 Notes: Data are means of 14 replications (6 replications from the original trial + 8 replications from the repeated trial). aRKN/100 cm3 soil = number of root-knot nematode juveniles and eggs extracted from root and soil in 100 cm3; bRKN/pot = total J2/pot and number of eggs per root system. cTotal RKN per plant divided by total dry root weight. dNematode reproduction factor (Rf = Pf/Pi), where Pf = the final population level and Pi = initial inoculum level. eMeans within a column followed by the same letter are not significantly different according to Fisher t-test using LSD α = 0.05. Mean separation is based on log10(x + 1) transformed data.
Table 3
Effect of fluensulfone, on population densities of Meloidogyne incognita infecting ‘Lovell’ peach under greenhouse conditions 40 and 70 days after inoculation (DAI).
| 40 DAI | 70 DAI | 70 DAI | 70 DAI | |||||
|---|---|---|---|---|---|---|---|---|
| Treatment | RKN/100 cm3 soila | RKN/potb | RKN/g dry rootc | Rfd | ||||
| Untreated control | 1,162 | ae | 139,697 | a | 20,253 | a | 3.44 | a |
| Fluensulfone at (3.92 kg a.i./ha) | 268 | b | 102,292 | a | 12,221 | a | 1.68 | a |
1 Notes: Data are means of 12 replications (6 replications from the original trial + 6 replications from the repeated trial). aRKN/100 cm3 soil = number of M. incognita J2 per 100 cm3 soil combined with number of eggs extracted from root segments obtained from 100 cm3 soil subsample. bRKN/pot = total J2/pot and number of eggs per root system. cTotal RKN per plant divided by total dry root weight. dNematode reproduction factor (Rf = Pf/Pi), where Pf = the final population level and Pi = initial inoculum level. eMeans within a column followed by the same letter are not significantly different according to Fisher t-test using LSD α = 0.05. Mean separation is based on log10(x + 1) transformed data.
Table 4
Effect of fluensulfone and spirotetramat, on population densities of Mesocriconema xenoplax infecting ‘Nemaguard’ peach under greenhouse conditions 30, 60, and 90 days after inoculation (DAI).
| 30 DAI | 60 DAI | 90 DAI | 90 DAI | |||||
|---|---|---|---|---|---|---|---|---|
| Treatment | Nematodes/100 cm3 of soila | Rfb | ||||||
| Untreated control | 75 | ac | 194 | a | 1,557 | a | 5.29 | a |
| Adjuvant as control | 137 | a | 138 | a | 1,127 | a | 3.57 | b |
| Spirotetramat at 0.026 kg a.i./ha | 85 | a | 198 | a | 1,071 | a | 3.83 | ab |
| Spirotetramat at 0.017 kg a.i./ha | 84 | a | 99 | a | 1,441 | a | 5.08 | ab |
| Fluensulfone at 3.92 kg a.i./ha | 12 | b | 11 | b | 65 | b | 0.22 | c |
1 Notes: Data are means of 13 replications (7 replications from the original trial + 6 replications from the repeated trial). aTotal ring nematode count, all life stages, per 100 cm3 soil. bNematode reproduction factor (Rf = Pf/Pi), where Pf = the final population level and Pi = initial inoculum level. cMeans within a column followed by the same letter are not significantly different according to Fisher t-test using LSD α = 0.05. Mean separation is based on log10(x + 1) transformed data.
Table 5
Effect of dual applications of spirotetramat, applied 10 and 40 days after inoculation (DAI), on population of Meloidogyne incognita infecting ‘Lovell’ peach under greenhouse conditions 40 and 70 days after inoculation (DAI).
| 40 DAI | 70 DAI | 70 DAI | 70 DAI | |||||
|---|---|---|---|---|---|---|---|---|
| Treatment | RKN/100 cm3 soila | RKN/potb | RKN/g dry rootc | Rfd | ||||
| Untreated control | 485 | ae | 12,869 | a | 1,672 | a | 0.37 | a |
| Adjuvant as control | 503 | a | 7,440 | a | 1,596 | a | 0.64 | a |
| Spirotetramat at 0.026 kg a.i./ha | 221 | b | 3,427 | a | 328 | a | 0.17 | a |
| Spirotetramat at 0.017 kg a.i./ha | 203 | b | 6,788 | a | 1,301 | a | 0.34 | a |
1 Notes: Data are means of 14 replications (6 replications from the original trial + 8 replications from the repeated trial). aRKN/100 cm3 soil = number of M. incognita J2 per 100 cm3 soil combined with number of eggs extracted from root segments obtained from 100 cm3 soil subsample. bRKN/pot = total J2/pot and number of eggs per root system. cTotal RKN per plant divided by total dry root weight. dNematode reproduction factor (Rf = Pf/Pi), where Pf = the final population level and Pi = initial inoculum level. eMeans within a column followed by the same letter are not significantly different according to Fisher t-test using LSD α=0.05. Mean separation is based on log10(x + 1) transformed data.