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Abstract
Foliar pests of watermelon in Hawaii include Liriomyza sativae Blanchard and Liriomyza trifolii (Burgess) (Diptera: Agromyzidae), Thrips palmi Karny (Thysanoptera: Thripidae), Aphis gossypii Glover (Homoptera: Aphididae), Tetranychus cinnabarinus (Boisduval) (Acari; Tetranychidae) and Trialeurodes vaporariorum Westwood (Homoptera: Aleurodidae). In studies in 43 commercial plantings arthropod pest densities remained below density treatment levels (DTLs) without weekly pesticide applications. T. palmi and A. gossypii were the major foliar pests on Oahu (1984–1985) and Molokai (1986) because DTLs were surpassed between 12 and 41 % of the survey dates. The occasions T. palmi and A. gossypii surpassed DTLs varied with locality and in the latter species with the presence of non‐persistent transmitted viruses. Liriomyza spp., T. cinnabarinus and T. vaporariorum densities surpassed DTLs less than 11 % of the survey dates.