Resumo

LOPEZ, Silvia N  e  SEGADE, Gonzalo. Whiteflies and natural enemies on orange crops under two types of sanitary management in San Pedro, Buenos Aires province. Rev. Soc. Entomol. Argent. [online]. 2017, vol.76, n.1-2. ISSN 0373-5680.

Whiteflies (Hemiptera: Aleyrodidae) are important pests that affect the genus Citrus. The objective of this study was to identify the species present in orange orchards in San Pedro (province of Buenos Aires) and to analyze their population evolution and that of their natural enemies under two sanitary management (conventional and organic). The density of adults, parasitized and non-parasitized nymphs, species and density of predators and parasitoids, presence of sooty mold on leaf/fruit, fruit yield and applied agrochemicals were recorded monthly. The prevalent species of whiteflies were Dialeurodes citri (Ashmead) and Singhiella citrifolii (Morgan), whose adult populations developed between October and May without differences between types of management. The nymphs were present throughout the year, with higher density in organic crops. Sooty mold levéis were similar for both managements. The predator Euseius concordis (Chant) (Acari: Phytoseüdae) was the most abundant natural enemy, with higher density in organic crops compared to conventional ones. There were low levéis of parasitism by Encarsia protransvena Viggiani, Encarsia group strenua (Hymenoptera: Aphelinidae) and Neopomphale sp. (Hymenoptera: Eulophidae). The fruit yield was higher in the conventional treatment. Results show the need of controlling the pest with less harmful producís for the beneficial fauna.

Palavras-chave : Dialeurodes citri. Singhiella citrifolii. Parasitoids. Predators. Citrus.

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