Table 2 Mean mortality (% ± SE) of 4th instar larvae of Rhynchophorus ferrugineus treated with Beauveria bassiana, Metarhizium anisopliae and Heterorhabditis bacteriophora. B. bassiana and M. anisopliae were used each @ 1 × 106 conidia ml−1 and H. bacteriophora was applied @ 100 IJs ml−1 (Bb: Beauveria bassiana, Ma: Metarhizium anisopliae, EPN: Heterorhabditis bacteriophora, IJs: Infective Juveniles).
Treatments | Intervalsa | Weekb | Observed mortality | Expected mortality | Chi Sq. | Type of interaction |
|---|---|---|---|---|---|---|
Bb | — | 1 | 9.18 | — | — | — |
— | 2 | 11.22 | — | — | — | |
— | 3 | 16.32 | — | — | — | |
Ma | — | 1 | 6.12 | — | — | — |
— | 2 | 9.18 | — | — | — | |
— | 3 | 14.28 | — | — | — | |
EPN | — | 1 | 12.24 | — | — | — |
— | 2 | 17.34 | — | — | — | |
— | 3 | 23.46 | — | — | — | |
Bb + EPN | 0 | 1 | 24.29 | 20.30 | 0.71 | Additive |
0 | 2 | 34.69 | 26.62 | 1.87 | Additive | |
0 | 3 | 51.02 | 35.96 | 4.44 | Synergistic | |
Ma + EPN | 0 | 1 | 19.58 | 17.61 | 0.19 | Additive |
0 | 2 | 28.86 | 24.93 | 0.53 | Additive | |
0 | 3 | 44.32 | 34.40 | 2.22 | Additive | |
Bb + EPN | 7 | 1 | 27.83 | 22.09 | 1.18 | Additive |
7 | 2 | 43.29 | 30.84 | 3.58 | Additive | |
7 | 3 | 61.85 | 42.99 | 5.75 | Synergistic | |
Ma + EPN | 7 | 1 | 23.71 | 20.30 | 0.48 | Additive |
7 | 2 | 38.14 | 29.15 | 2.11 | Additive | |
7 | 3 | 55.67 | 40.64 | 4.05 | Synergistic | |
Bb + EPN | 14 | 1 | 42.26 | 30.84 | 3.08 | Additive |
14 | 2 | 58.76 | 42.99 | 4.23 | Synergistic | |
14 | 3 | 80.41 | 57.39 | 6.58 | Synergistic | |
Ma + EPN | 14 | 1 | 36.08 | 29.15 | 1.33 | Additive |
14 | 2 | 54.63 | 40.64 | 3.58 | Additive | |
14 | 3 | 72.16 | 53.95 | 4.50 | Synergistic |