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Effect of Crop Rotations on Rotylenchulus reniformis Population Structure
Megan Leach1, Paula Agudelo1, Amy Lawton-Rauh2
1Department of Entomology, Soils, and Plant Sciences, 206 Long Hall, Clemson University, Clemson, SC 29634.
Plant Disease
|February 9, 2019
Summary
Crop rotation significantly alters the genetic makeup of the reniform nematode (Rotylenchulus reniformis). Planting resistant soybean or corn effectively changes nematode populations, crucial for managing this agricultural pest.
Area of Science:
- Agricultural Science
- Nematology
- Genetics
Background:
- Rotylenchulus reniformis is a significant pest in cotton production, particularly in the southeastern United States.
- Crop rotation with resistant or poor host crops is a key strategy for managing reniform nematode populations.
Purpose of the Study:
- To investigate the impact of different crop rotation schemes on the predominant genotype of Rotylenchulus reniformis.
- To assess the effectiveness of various crop rotations in altering reniform nematode population structure.
Main Methods:
- Six distinct crop rotation schemes were implemented over four 120-day cycles.
- Amplified fragment length polymorphisms (AFLPs) were used to analyze changes in nematode genotype composition after each cycle.
- Four primer pairs were utilized, generating a total of 279 polymorphic bands for analysis.
Main Results:
- Distinct shifts in reniform nematode genotype composition were observed after rotations involving resistant soybean or corn.
- Rotations incorporating soybean, both susceptible and resistant varieties, demonstrated the most substantial impact on nematode population structure.
- The study successfully characterized field population variability and responses to different crop rotations.
Conclusions:
- Crop rotation strategies, especially those involving resistant soybean or corn, can effectively modify reniform nematode populations.
- Understanding nematode population dynamics in response to crop rotations is vital for enhancing the durability of resistant crop varieties.
- Identifying effective rotation schemes is crucial for sustainable management of Rotylenchulus reniformis in agricultural systems.
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