Table 2 Natural incidence of Metarhizium rileyi infection on maize fall armyworm in relation to weather variables during 2019–2020
Observation period, week (fortnight) | FAW infestation (%) | Metarhizium rileyi infection (%) | Rainfall (mm) | Temp, °C, max | Temp, °C, min | RH%, FN | RH%, AN |
|---|---|---|---|---|---|---|---|
Sept. I fortnight, 33 and 34 stdw | 12.51 | 0.0 | 136.4 | 31.44 | 24.97 | 86.6 | 75.13 |
Sept. II fortnight, 35 and 36 stdw | 19.64 | 0.0 | 239.7 | 31.99 | 25.06 | 99.47 | 72.0 |
Oct. I fortnight, 37 and 38 stdw | 32.01 | 5.61 | 75.9 | 32.98 | 24.11 | 94.87 | 65.63 |
Oct. II fortnight, 39 and 40 stdw | 41.24 | 11.39 | 236.7 | 30.61 | 24.39 | 95.30 | 50.75 |
Nov. I fortnight, 41 and 42 stdw | 46.88 | 38.02 | 3.3 | 30.29 | 23.63 | 82.6 | 62.6 |
Nov. II fortnight, 43 and44 stdw | 46.44 | 22.93 | 0.0 | 31.18 | 20.63 | 90.6 | 48.6 |
Dec. I fortnight, 45 and 46 stdw | 40.90 | 16.48 | 0.2 | 30.07 | 20.28 | 90.8 | 52.27 |
Dec. II fortnight, 47 and 48 stdw | 27.11 | 14.12 | 0.0 | 27.23 | 19.63 | 98.0 | 54.87 |
Jan. I fortnight, 1 and 2 stdw | 21.05 | 5.84 | 0.8 | 29.17 | 17.01 | 93.6 | 55.13 |
Jan. II fortnight 3, and 4 stdw | 18.25 | 3.9 | 0.0 | 31.39 | 18.72 | 89.56 | 52.63 |
Feb. I fortnight, 5 and 6 stdw | 14.7 | 3.1 | 1.11 | 30.49 | 19.88 | 91.73 | 58.46 |
Feb. II fortnight, 7 and 8 stdw | 11.02 | 0.0 | 0.06 | 32.68 | 19.06 | 91.07 | 45.14 |