Damage Function and Economic Threshold for Belonolaimus longicaudatus on Potato

Area of Science:

• Plant Pathology
• Nematology
• Agricultural Science

Background:

• Belonolaimus longicaudatus is a known potato pathogen.
• A quantitative damage function and economic threshold for this nematode on potato are currently lacking.
• Understanding these factors is crucial for effective nematode management.

Purpose of the Study:

• To derive a damage function for Belonolaimus longicaudatus on potato (Solanum tuberosum).
• To calculate the economic threshold population density for nematicide application.
• To provide data for informed agricultural management decisions.

Main Methods:

• Field study data on cropping systems and nematode management were utilized.
• Soil samples were collected, and Belonolaimus longicaudatus were extracted using a centrifugal-flotation method from 130 cm³ subsamples.
• Linear regression analysis was performed to establish the relationship between potato yield and nematode population density at planting.

Main Results:

• A damage function relating potato yield to Belonolaimus longicaudatus population density was successfully derived.
• The economic threshold for nematicide application was calculated to be 2 to 3 Belonolaimus longicaudatus per 130 cm³ of soil.
• This threshold is close to the detection limit of the extraction methodology used.

Conclusions:

• The derived damage function provides a tool for predicting yield losses in potato due to Belonolaimus longicaudatus.
• The low economic threshold highlights the high sensitivity of potato to this nematode, even at low population densities.
• Management strategies should consider early detection and intervention at very low nematode levels.