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Use of Abamectin and Azoxystrobin for Managing Stubby‐Root Nematode( Trichodorus obtusus Cobb) Damage to Zoysiagrass
Author(s) -
Shaver Bradly R.,
Agudelo Paula,
Martin S. Bruce
Publication year - 2016
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2015.08.0528
Subject(s) - abamectin , biology , azoxystrobin , phytosanitary certification , zoysia japonica , agronomy , oxamyl , horticulture , toxicology , pesticide
Non‐fumigant nematicides currently available for turfgrass have provided inconsistent nematode suppression and turf quality improvement. New products and management strategies are being evaluated to find alternatives to these chemistries. Field, greenhouse, and in vitro studies were conducted to determine the efficacy of abamectin and azoxystrobin for mitigating damage to ‘Empire’ zoysiagrass ( Zoysia japonica Steud) turf caused by a stubby‐root nematode ( Trichodorus obtusus Cobb, 1913). Three years of data from greenhouse trials showed differences among treatments that were not observed in field trials. Combining azoxystrobin with abamectin formulations resulted in the highest root weights of any treatment for two out of three years, increasing root weights as much as threefold relative to the control. Differences in root weights for treatments containing abamectin were seen in all 3 yr. Data from the toxicity experiments show differences among formulations of abamectin. The commercial formulation of abamectin consistently immobilized a higher percentage of T. obtusus at all concentrations and evaluation periods compared to other treatments. Results indicate abamectin and azoxystrobin are useful for managing T. obtusus on zoysiagrass.