Table 2.
Mean parts per million (ppm) of clothianidin (95% CI) found in citrus leaf tissue
| Tree size | Application rate per tree | Weeks after application | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | ||
| Small 0.08 m3 MCVa |
Untreated | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0.37 g Platinum 75SG | 0 | 1.99b (0.77–3.21) |
2.45cd (0.81–4.09) |
5.82c (4.07–7.56) |
4.50cd (2.85–6.15) |
6.29b (5.07–7.52) |
4.33b (2.45–6.21) |
2.65b (1.57–3.73) |
1.84b (1.39–2.29) |
1.46b (0.94–1.98) |
0.85b (0.52–1.17) |
0.55b (0.43–0.66) |
0.40b (0.22–0.58) |
|
| 0.74 g Platinum 75SG | 0 | 3.27b (1.46–5.08) |
8.62d (4.27–12.96) |
12.12c (6.77–17.47) |
13.09d (8.34–17.85) |
15.44b (7.32–23.57) |
14.02c (7.95–20.09) |
11.53c (7.67–15.39) |
7.25c (3.63–10.88) |
5.01c (3.00–7.02) |
5.02c (3.04–6.99) |
2.21c (1.05–3.37) |
1.45c (0.84–2.05) |
|
| Large 1.34 m3 MCVa |
Untreated | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0.37 g Platinum 75SG | 0 | 0.26ab (0.00–0.97) |
0.39b (0.00–0.82) |
0.38b (0.17–0.58) |
0.48b (0.10–0.87) |
0.21a (0.00–0.78) |
0.19a (0.00–0.81) |
0.18a (0.00–0.66) |
0.14a (0.00–0.81) |
0.09a (0.00–0.56) |
0.04a (0.00–0.38) |
0.03a (0.00–0.22) |
0.05a (0.00–0.14) |
|
| 0.74 g Platinum 75SG | 0 | 0.68ab (0.00–1.42) |
1.15bc (0.45–1.85) |
1.06b (0.38–1.73) |
1.69bc (0.00–3.75) |
0.86a (0.37–1.36) |
0.74a (0.26–1.23) |
0.40a (0.00–0.90) |
0.33a (0.00–0.98) |
0.30ab (0.00–0.77) |
0.29ab (0.00–0.60) |
0.17a (0.00–0.36) |
0.09a (0.00–0.18) |
|
| P-value | – | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | |
| χ2 | – | 29.17 | 40.86 | 42.45 | 43.16 | 32.66 | 36.60 | 35.43 | 35.16 | 32.25 | 32.20 | 34.93 | 35.47 | |
Mean separations within columns indicate differences between treatments within weekly samples. Values sharing the same letter do not differ significantly at α ≤ 0.05.
aMean volume of citrus tree canopy.