SIRATAC users have the option early in the season of using standard thresholds or dynamic thresholds which vary between the standard level and an upper limit. Thresholds are increased if the crop is early and there will be no yield loss. If the crop is late, or if a yield loss would occur> then thresholds are reduced to base level. Dynamic thresholds aim to maintain yield and quality while avoiding unacceptable harvest delays and normally reduce the number of early season sprays by one or two. However, early crop protection is still a controversial subject within the cotton industry, and most growers do not use the dynamic option within SIRATAC.