Spatial distribution and sequential sampling plan for Oligonychus punicae (Acari: Trombidiformes: Tetranychidae) on...

Area of Science:

• Agricultural Entomology
• Pest Management
• Spatial Distribution Analysis

Background:

• Effective pest management relies on accurate infestation assessment.
• Sequential sampling plans offer rapid characterization for timely decision-making.
• Oligonychus punicae is a significant pest in grapevine cultivation.

Purpose of the Study:

• Investigate the spatial distribution of Oligonychus punicae in grapevine crops.
• Identify optimal monitoring sites (branch, leaf, leaf region) for O. punicae.
• Develop a sequential sampling plan for O. punicae control in table grape varieties.

Main Methods:

• Spatial distribution analysis of O. punicae across different grapevine varieties and phenological stages.
• Determination of representative sampling units within the grapevine canopy.
• Development of economic thresholds for O. punicae infestation.

Main Results:

• O. punicae distribution varied significantly among grapevine varieties.
• No consistent distribution pattern was found on branches or leaves.
• Higher O. punicae populations were concentrated in the central leaf regions.
• Economic thresholds were established: lower threshold at 36% infestation, upper threshold at 40%.

Conclusions:

• A sequential sampling plan for O. punicae in grapevines was successfully developed.
• Monitoring central leaf regions is recommended for efficient sampling.
• The plan optimizes resource allocation and minimizes environmental impact in O. punicae management.