Table 1.
Infestation of Mythimna separata (mean numbers of larvae & pupae) on wheat crop and their correlations with incorporated/retained residue in different tillage-cum-crop establishment and residues management practices of Indo-Gangetic Plains at 65 days after sowing (larvae) and after harvesting of crop (pupae) during recent different years.
| Scenarios* | Number of larvae (m−2) | Number of pupae (m−2) | ||||
|---|---|---|---|---|---|---|
| 2018–2019 | 2019–2020 | 2020–2021 | 2018–2019 | 2019–2020 | 2020–2021 | |
| Sc1 (FP) | 0.20 ± 0.02a | 0.80 ± 0.58a | 1.60 ± 0.81a | 0.00 ± 0.00a | 0.20 ± 0.20a | 0.40 ± 0.24a |
| Sc2 (FP) | 0.60 ± 0.40a | 0.60 ± 0.60a | 2.00 ± 0.95a | 0.20 ± 0.20a | 0.40 ± 0.24a | 0.60 ± 0.24a |
| Sc3 (pCA) | 1.40 ± 0.51ab | 4.20 ± 1.24ab | 7.60 ± 1.43b | 0.40 ± 0.24a | 1.00 ± 0.32ab | 1.60 ± 0.40ab |
| Sc4 (pCA) | 3.20 ± 1.16b | 6.60 ± 1.50b | 9.60 ± 1.88b | 1.00 ± 0.45a | 1.60 ± 0.24b | 2.00 ± 0.45b |
| Sc5 (pCA) | 1.60 ± 0.81ab | 5.00 ± 1.38b | 6.80 ± 1.88b | 0.40 ± 0.24a | 1.00 ± 0.32ab | 1.40 ± 0.51ab |
| Sc6 (CA) | 2.20 ± 0.66ab | 4.00 ± 1.30ab | 7.40 ± 1.08b | 0.40 ± 0.24a | 0.80 ± 0.37ab | 1.60 ± 0.24ab |
| Sc7 (CA) | 3.40 ± 0.93b | 8.00 ± 1.48b | 10.40 ± 1.53b | 1.20 ± 0.49a | 1.80 ± 0.37b | 2.40 ± 0.24b |
| Number of larvae/pupae (m2) regressed on residue incorporated/retained (r) | ||||||
| Larvae (m2) | Pupae (m2) | |||||
| Y = 0.23x + 2.66 (R2 = 0.82*) | Y = 0.06X + 0.59 (R2 = 0.89**) | |||||
Mean values followed by standard error and different superscript small letters within a column are significantly different; * and ** indicate significant at P<0.05 and <0.001, respectively.