Aphids (Hemiptera: Aphididae) and associated biota from The Kingdom of Tonga, with respect to biological control.
Surveys of the aphid and associated insect fauna of Tonga were conducted as part of a biological control program against the banana pest Pentalonia nigronervosa, using the polyphagous aphidiine parasitoid Aphidius colemani. Ten aphid species were collected, plus 3 species of primary parasitoids (Aphelinidae and Braconidae); one species of hyperparasitoid (Charipidae); coccinellid, hemerobiid and syrphid predators; parasitoids of syrphids (Ichneumonidae and Encyrtidae); and 11 species of aphid-attendant ants. The aphids Brachycaudus helichrysi, Hyperomyzus carduellinus, Hysteroneura setariae , Myzus persicae and Toxoptera citricidus are new records for Tonga. Aphis craccivora, A. gossypii, Brachycaudus helichrysi, Myzus persicae, P. nigronervosa, Rhopalosiphum maidis, Toxoptera aurantii and T. citricidus are all known to be suitable hosts for A. colemani. Compiled distributional data of aphids on South Pacific islands show that these species are present throughout the region, which suggests that A. colemani could be a useful addition to the insect fauna of the region. Aphidius colemani was recovered in 1992 from Aphis gossypii.