1. THE CONTROL OF WHEAT BULB FLY IN WINTER WHEAT 1.3. Trials in Essex and the Isle of Ely, 1963-1964.

This article describes the trials conducted in Essex, England and the Isle of Ely during 1963-1964. The trial in Essex was laid down on a clay loam while the other on a peaty loam in the Isle of Ely. All seed dressings were used at 2 ounce per bushel of seed. A liquid mercury dressing was applied to the seed used on the dimethoate spray and the control plots. On the clay loam site Bayer 37289 was highly phytotoxic, more so at one end of the trial where the soil contained a sand fraction. Bayer 38156 looked promising early in the season but the plants succumbed during the secondary attack. On the peaty loam site Bayer 37289 delayed germination but the plants recovered by mid-March. This treatment again gave reasonable control, as did Bayer 38156.