Abstract
Oats of the variety Condor were sown late (28 April) to encourage attack by frit fly. From an area of approximately 40 x 20 yd forty-five plots were sited at random using tables of random numbers, and divided into three series of fifteen plots (Fig. 1). Plots of series A were surrounded by straw barriers that had been dipped in 0-5% DDT; plots of series B were surrounded by similar DDT barriers, but the oats were also sprayed with 0.5% parathion solution on 6 May and 20 May; plots of series C were left unprotected and untreated. Five plots from each series were used to estimate the number of eggs laid by frit flies, five to estimate the number of plants damaged by larvae and five to estimate the number of adults that emerged. As the sprayed plots were almost undamaged by frit fly larvae, plants were not removed for examination and the plots were used to determine the number of flies emerging in the panicle generation and the yield of grain.
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