Presence-absence sampling for Tetranychus urticae and its predator Neoseiulus californicus (Acari: Tetranychidae; Phytoseiidae) on strawberries
We propose a systematic presence-absence sampling plan for estimating densities of both Tetranychus urticae Koch (Acari: Tetranychidae) and its predator Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) on strawberries. It is based on the synchrony and spatial coincidence between prey and pre...
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
2004
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
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| Sumario: | We propose a systematic presence-absence sampling plan for estimating densities of both Tetranychus urticae Koch (Acari: Tetranychidae) and its predator Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) on strawberries. It is based on the synchrony and spatial coincidence between prey and predator. Active stages of both species on each leaflet and the proportion of T. urticae-free leaflets were recorded from 87 samples collected during two growing seasons on five commercial farms. Seventy to 160 leaflets in a sample were taken at intervals of 5-10 m in each row. The distribution-free equation Ln(m) = a + b Ln(-Ln(p)) was used to describe the relationships between the mean number (m) of T. urticae and N. californicus per leaflet and the proportion (p) of T. urticae-free leaflets. We devised the following density estimators: T. urticae: ̄mTu=exp(2.78 + 1.31 Ln(- Ln p)) and N. californicus: ̄mNc=exp(-0.04 + 0.76 Ln(-Ln p)). These estimates, complemented with the knowledge of the economic level of damage and the number of predators necessary to control different densities of T. urticae, are likely to help reduce the use of acaricides in the context of integrated pest management of T. urticae on strawberry. |
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| ISSN: | 09670874 |
| DOI: | 10.1080/09670870310001626338 |