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Developments in the use of insecticides for the control of the sugarcane thrips Fulmekiola serrata (Kobus) in South Africa.

Over two seasons, two trials were conducted to assess the at-planting use of insecticides for the suppression of Fulmekiola serrata (Kobus) (Thysenoptera: Thripidae) in sugarcane. Products tested in the first trial were two formulations of imidacloprid as well as aldicarb and oxamyl. In the second trial three rates of each imidacloprid formulation were tested and two rates of carbofuran. Crops were planted monthly from October to December in the first trial and from September to December in the second. The imidacloprid formulations, in both trials, were the more effective. In the first trial these significantly improved tons sucrose/ha in the November planted crop, showing a yield increase of between 20.7% and 21.7% compared to the control. In the second trial yield responses (tons sucrose/ha) were also obtained from these formulations. Depending on rate and formulation, significant increases of between 40% and 49% were obtained in the September planted crop. In the first trial, at the time of peak thrips pressure (January), oxamyl and an imidacloprid formulation significantly reduced numbers, but only in the November planted crop. In the second trial, only imidacloprid formulations significantly reduced numbers at all planting dates.