Effects of fruit form removals on cotton yields in Central Queensland

Abstract

During 1957-1959 four trials in both irrigated and rain-grown cotton were conducted in Central Queensland. Removals of all squares and bolls were carried out during eight weeks following the first burst of squaring, approximately three weeks after the appearance of the first squares. Removals during the first four weeks did not affect yields. Maturing of replacement squares following removals during the next four weeks was dependent on length of season and growing conditions. The effect of loss and damage among squares and bolls late in the season was demonstrated by an unusually severe Heliothis armigera (Hubn.) attack during March and the incidence of Pectinophora scutigera (Hold.) during 1958-59.