Other Contributions: Control of Pratylenchus brachyurus in Rough Lemon Seedlings with Dowco 275 (Diethyl-Fluoro-Pyridyl-Phosphorothioate

  • J. J. Frederick
  • A. C. Tarjan


Soil amendment with Dowco 275 (0-0 diethyl 0-(6-fluoro-2 pyridyl) phosphorothioate) granules at rates of 5.6 to 22.4 kg/ha (a.i.) around 2-yr-old potted rough lemon (Citrus jambhiri Lush.) seedlings in the greenhouse gave significant control of Pratylenchus brachyurus and increased top growth of the plants. Beneficial effects of treatment occurred at all but the lowest rates used. The 5.6 and 11.2 kg/ha rates resulted in 19 to 27% and 43 to 54% increase in height and weight of aerial (aboveground) parts respectively, and a 46 to 86% decrease in nematode population as compared to controls. Application of higher rates of the chemical resulted in negligible additional benefits.