| Potato Leafhopper Resistant Trial | |||||||
| Total | Total | Relative Yield |
Heighta | Injuryb |
Nymphc | ||
| Variety | 2001 | 2000 | 2001 | 13-Jul | 13-Jul |
25-Aug | 13-Jul |
| Commercial Seed: | ------- Tons Dry Matter/Acre ------- | % mean | |||||
| Evergreen | 6.72 | 2.34 | 105 | 15.0 | 1.8 | 1.9 | 14.0 |
| Clean Sweep | 6.48 | 2.16 | 101 | 11.4 | 2.6 | 2.9 | 29.3 |
| DK131HG | 6.32 | 2.58 | 98 | 13.1 | 1.9 | 1.8 | 9.7 |
| 5454 | 6.05 | 2.40 | 94 | 10.9 | 4.1 | 3.7 | 41.7 |
| Experimental Seed: | ------- Tons Dry Matter/Acre ------- | % mean | |||||
| 4S86* | 6.92 | 2.40 | 108 | 13.8 | 1.6 | 1.8 | 3.2 |
| 3S77* | 6.72 | 2.50 | 104 | 14.1 | 1.5 | 1.5 | 5.3 |
| 4S92* | 6.71 | 2.49 | 104 | 15.2 | 1.2 | 1.5 | 2.4 |
| ZH9930H* | 6.20 | 2.70 | 96 | 14.8 | 1.5 | 1.8 | 2.3 |
| ZH9841H* | 5.77 | 2.35 | 90 | 10.3 | 3.6 | 3.2 | 27.0 |
| Mean | 6.43 | 2.43 | -- | 13.2 | 2.2 | 2.3 | 15.0 |
| LSD 0.05 | 0.61 | ns | -- | 1.8 | 0.4 | 0.7 | 11.0 |
| CV % | 6.50 | 11.60 | -- | 9.3 | 13.9 | 20.0 | 50.2 |
| no. of harvests | 4.00 | 2.00 | -- | -- | -- | -- | -- |
| * Variety tested using experimental seed that may not give performance identical to that of commercially available seed. | |||||||
| ** Note: Stand density in early April was 90 - 95% for all varieties. | |||||||
| Data subjected to Nearest Neighbor AOV, adjusted means reported. | |||||||
| a Height recorded in
inches
b Potato leafhopper injury rated from 1 = least to 5 = most severe reported c Nymph = Number of nymphs collected with two pan sweeps | |||||||
| Establishment: | Seeded with a Hege 3-point hitch drill with presswheels at 16 lb/a. Eptam was applied PPI at 2 qt/a. | ||||||
| Plot size: | 4' x 20' , 15'alleys and borders, RCBD with four reps. | ||||||
| Soil type and analysis: | Crosby silt loam, pH=6.7, P=56 lbs/s, K=228 lbs/a, CEC=8.4, O.M.=3.2, (11/00). | ||||||
| 2001 Fertilization: | 300 lb/a of 0-0-60 was fall applied. | ||||||
| 2001 Pest control: | Insecticide applied 25-April for alfalfa weevil control. Herbicide was applied 14-August for weed control. | ||||||