Thiacloprid (Calypso) was tested for efficacy against the cotton aphid, Aphis gossypii, from 1995 through 2000. A total of eleven tests were conducted with comparisons to several standard treatments. Peak aphid densities ranged from moderate (100/leaf) to extremely high (400/leaf). In all cases, aphid densities were well over an economic threshold. Insecticide applications were made with a tractor-mounted boom in the months of July and August. When taking an average of percent control across all five years, the results are as follows. Calypso and thiamethoxam showed faster knockdown than Provado at 7 days after treatment (DAT). At 14DAT, Calypso 0.047 lb ai/A gave the best control followed by Calypso 0.025 lb ai/A and Provado 0.047 lb ai/A and thiamethoxam 0.047 lb ai/A. At 21DAT, Calypso 0.025 and 0.047 lb ai/A maintained a high level of aphid control. Provado and thiamethoxam treatments began to decline.

Evaluations at 28DAT and 35DAT are based on two and one experiment respectively. At 28DAT, Calypso 0.025 and 0.047 lb ai/A continued to show a high level of aphid control whereas thiamethoxam and Provado treatments provided marginal control. At 35DAT, Calypso 0.047 lb ai/A provided far better aphid control than Provado or thiamethoxam treatments. In summary, Calypso provided the fastest and longest lasting aphid control of all the products tested.