Table 3. Linear mixed model fitted to wheat stem sawfly larval body weight (mg), larval mortality (%) and wheat stem lodging (1-10 rating) data with main effects for treatment (chemical type) and application timing and a location for random effect.
| Fixed effect | Parameter estimate | SE | t value | P |
|---|---|---|---|---|
| Body weight | ||||
| (Intercept) | 12.90 | 1.12 | 11.48 (135) | <0.001 |
| Treatment (cis-jasmone) | 1.86 | 0.53 | 3.49 (135) | 0.01 |
| Treatment (Control) | 2.69 | 0.53 | 5.05 (135) | <0.0001 |
| Treatment (Azadirachtin®) | 1.84 | 0.54 | 3.44 (135) | <0.001 |
| Application timing (egg and larva stage) | −1.22 | 0.46 | −2.66 (135) | 0.01 |
| Application timing (larval stage) | −0.89 | 0.46 | −1.99 (135) | 0.06 |
| Larval mortality | ||||
| (Intercept) | 33.33 | 4.81 | 6.93 (130) | <0.001 |
| Treatment (cis-jasmone) | −9.00 | 5.42 | −1.66 (130) | 0.10 |
| Treatment (Control) | −15.25 | 5.42 | −2.81 (130) | 0.01 |
| Treatment (Azadirachtin®) | −7.25 | 5.42 | −1.33 (130) | 0.18 |
| Application timing (egg and larva stage) | 11.25 | 5.42 | 2.08 (130) | 0.04 |
| Application timing (larval stage) | −5.67 | 5.42 | −1.05 (130) | 0.29 |
| cis-jasmone*egg and larva stage | −8.17 | 7.67 | −1.14 (130) | 0.26 |
| Control*egg and larval stage | −8.50 | 7.67 | −1.11 (130) | 0.27 |
| Azadirachtin® *egg and larval stage | −26.50 | 7.67 | −3.46 (130) | <0.001 |
| cis-jasmone*larval stage | 13.83 | 7.67 | 1.80 (130) | 0.07 |
| Control*larval stage | −6.58 | 7.67 | 0.86 (130) | 0.39 |
| Azadirachtin® *larval stage | −6.58 | 7.67 | 1.47 (130) | 0.14 |
| Stem lodging | ||||
| (Intercept) | 5.36 | 0.70 | 7.92 (138) | <0.001 |
| Treatment (cis-jasmone) | 1.88 | 0.34 | 5.54 (138) | <0.001 |
| Treatment (Control) | 2.69 | 0.34 | 7.91 (138) | <0.001 |
| Treatment (Azadirachtin®) | 1.11 | 0.34 | 3.26 (138) | 0.001 |
Note:
Parameter estimates are with reference to Actigard® treatment and application timing at egg stage. Degrees of freedom are given in parenthesis.