Abstract
SUMMARYBetween mid‐July and the end of August in 1977 and 1978, wheat bulb flies were caught in white water‐traps at 16 oviposition sites in eastern Scotland. The numbers of females caught per site and the subsequent egg populations, estimated from soil‐cores from each site, were linearly related. Water‐trapping may therefore provide a reliable and early forecast of egg numbers, independent of soil‐sampling, and so enable seed treatment to be limited to years when the risk of damage is great.
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