1. THE CONTROL OF WHEAT BULB FLY IN WINTER WHEAT 1.1. Trials in Suffolk, Holland (Lines), and the Isle of Ely, 1963-1964.

This article focuses on the control of wheat bulb fly in winter wheat during trials in Suffolk, Holland and Isle of Ely in 1963-1964. On March 27, 1963, a randomized block trial was laid down in Suffolk in a field where 97 percent of the plants were attacked and there were 1.7 shoots per plant. By this time 50 percent of the larvae were in the second instar. Treatments were applied as soon as the plots had been demarcated and larval assessments were made eight days later. The other trials were done in early March 1964. In Holland, 50 percent of the plants were attacked at the time treatments were applied, and in the Isle of Ely 72 percent were attacked. Plant samples were examined four weeks after treatment, and no yield assessments were made because all plots recovered from the attack.