Density Treatment Level for Tomato Pinworm (Lepidoptera: Gelechiidae) Based on Pheromone Trap Catches

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Abstract:

The initiation of a weekly insecticide treatment schedule with methomyl at 0.5 kg Al/ha for control of the tomato pin worm, Keiferia lycopersicella (Walsingham), based on pheromone trap catches was investigated from 1978–1981. The initiation of a weekly insecticide treatment schedule based on density treatment levels of ca. 10, 15, or 30 moths per trap per night (M/T/N) captured in a pheromone trap over a one-and-one-half week period were compared to a weekly insecticide treatment schedule initiated at the start of the growing season (grower practice) and an untreated control. A density treatment level of ca. 10 M/T/N over a one-and-one-half week period resulted in an infestation level similar to that obtained by a treatment program initiated at the start of the growing season while at the same time resulted in a decrease of 2-3 insecticide applications. Initiation of a treatment program based on 15 or 30 M/T/N resulted in unacceptable infestation in the fruit. The relationship between moth flight activity, larval infestation in the foliage, and percent infested fruit was investigated in the untreated replicates. There was a strong statistical relationship (r = 0.95) between the mean number of larvae/ row-m in the foliage and the mean percent infested fruit one week later. There was a weaker relationship (r = 0.76) between the mean number of M/T/N and the mean percent infested fruit two weeks later.

Document Type: Research Article

Publication date: June 1, 1983

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