Sampling of the two-spotted spider mite Tetranychus urticae, the predator Neoseiulus californicus and the whitefly Trialeurodes vaporariorum on roses in greenhouses | Controle de l'acarien jaune Tetranychus urticae, du predateuer Neoseiulus californicus et de l'aleurode Trialeurodes vaporariorum en culture de roses sous serre
Gilli, C. | Farinet, R. | Mittaz, Ch. | Carlen, Ch.(Agroscope RAC Changins, Station federale de recherches agronomiques, Conthey (Switzerland). Centre d'arboriculture et d'horticulture des Fougeres)
Biological control methods make their beginnings in ornamental crops. The acquisition of practical sampling methods for beneficial organisms and pests is necessary to enhance biological control on roses. The aim of this study was to validate simple sampling method for spider mites, one of its predators and whiteflies on roses grown in greenhouse. The Nachmann function showed strong relations between the percentage of leaves, of the bended as well as of the commercial stems, occupied by at least one mobile stage of Tetranychus urticae and its predator Neoseiulus californicus, and their respective densities. For whitefly, the same type of relation with a high coefficient of correlation exists between the percentage of leaves of the commercial stems occupied by at least one adult and the respective density. For the whitefly larvae, the percentage of occupation and the density are also related. These results allow to validate the use of a sampling method based on the percentage of occupation of leaves by mobile stages of spider mite, whitefly larvae and adults. Since the percentages of occupation of leaves by T urticae and N. californicus on commercial and on bending stems were well correlated, monitoring of these two mites on the bending stems will be sufficient for practical use. Yellow sticky traps, as well examinated, can not be used to evaluate the evolution of the whitefly populations.
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