Identifier

etd-04142014-115743

Degree

Master of Science (MS)

Department

Plant Pathology and Crop Physiology

Document Type

Thesis

Abstract

In 2011 and 2012, 100 residential lawns in the Baton Rouge, LA area were sampled to document the incidence of plant-parasitic nematodes, in addition four full-season microplot experiments and four 71-day duration greenhouse experiments were conducted to evaluate their pathogenicity on St. Augustine and centipede turfgrasses. Nematode genera associated with both turfgrasses included Criconemella, Helicotylenchus, Meloidogyne, Pratylenchus, Tylenchorynchus and Tylenchus spp. In microplot trials in 2012, nematodes did not cause significant damage to either turfgrass, but soil exhibited an effect on plant growth parameters. In 2013, when there was significant nematode related injury to both turfgrasses, there were no significant effects of soil on plant growth parameters. Greenhouse based pathogenicity trials were conducted separately with Meloidogyne incognita and Pratylenchus zeae. Across two levels of nematode infestation, reductions below controls for St. Augustine and centipede averaged 24% and 28% for M. incognita and 37.0% and 39.3% for P. zeae; indicating that overall, P. zeae was more damaging than M. incognita to both turfgrasses.

Date

2014

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

McGawley, Edward

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