Integrated pest control programme in intermediate savannahs of Guyana.
As part of an integrated pest control programme at Eberoabo in Guyana, systematic monitoring of insect pest populations and their natural enemies on selected crops was carried out. The main pest of maize was Spodoptera frugiperda (J.E. Smith), and Mocis repanda (F.) and Rhopalosiphum maidis (Fitch) (Aphis maidis) were also recorded. A large number of parasites and predators of S. frugiperda and M. repanda were recorded, including 9 species of Hymenoptera, 3 species of Diptera and 3 species of Coleoptera; the egg parasite Telenomus remus Nixon and the larval ectoparasite Euplectrus platyhypenae How. were introduced from Barbados and released in small numbers. The most commonly recorded pests on black eye peas [Vigna unguiculata] were S. frugiperda and Alabama argillacea (Hb.) (Anomis argillacea); infestation by Liriomyza trifolii (Burgess) was high in some fields. Other pests were Maruca testulalis (Geyer), Pseudoplusia includens (Wlk.) and R. maidis. Numerous species of Hymenoptera and Diptera were natural enemies of these pests. Pigeon pea [Cajanus cajan] was heavily infested by a complex of pests including Heliothis virescens (F.) and P. includens; other pests recorded were M. testulalis, Urbanus dorantes (Stoll) (Eridamus retractus (Plotz)), cicadellids, sucking bugs, thrips, aphids and mites. The most common pests of sorghum were S. frugiperda, Mocis repanda, Perichares philetes Gmel. and R. maidis; their natural enemies included Apanteles sp. and the aphid predators Cycloneda sanguinea (L.), Coleomegilla maculata (Deg.) (Ceratomegilla maculata), Scymnus sp. and Chrysopa sp.