Avermectin B1, isazofos, and fenamiphos for control of Hoplolaimus galeatus and Tylenchorhynchus dubius infesting Poa annua

Document Type

Article

Date of Original Version

12-1-1996

Abstract

Avermectin B1, isazofos, and fenamiphos were evaluated in greenhouse experiments for efficacy against two common turfgrass parasites. Hoplolaimus galeatus and Tylenchorhynchus dubius. Treatments in all experiments were arranged in a completely randomized design and replicated four times. In the first experiment, avermectin B1 at rates of 0.2 and 0.4 kg a.i./ha and isazofos at rates of 2.3 and 23 kg a.i./ha significantly reduced populations of both species of parasitic nematodes compared to controls at 14 and 28 days after treatment (P ≤ 0.01). In the second experiment, the greatest reductions in both nematode populations occurred at 28 and 56 days after treatment, where 23 kg a.i./ha of isazofos was applied (P ≤ 0.01). These reduction, however, were not different from reductions of H. galeatus at 28 and 56 days after treatment (P ≤ 0.01) or T. dubius at 56 days after treatment (P ≤ 0.01), where 0.2- and 0.4-kg a.i./ha rates of avermectin B1 were mixed throughout the soil. In the third experiment, the greatest population reduction of H. galeatus was observed with a 0.4-kg a.i./ha treatment of avermectin B1 at 56 days after treatment (P ≤ 0.05). T. dubius populations were reduced by the 0.4-kg a.i./ha rate of avermectin B1 at 28 (P ≤ 0.01), 56 (P ≤ 0.05), and 70 (P ≤0.01) days after treatment. In the fourth and fifth experiments, avermectin B1 at rates of 7.5 and 15.2 kg a.i./ha consistently reduced nematode populations compared to controls and performed as well or better than fenamiphos (P ≤ 0.01).

Publication Title, e.g., Journal

Journal of Nematology

Volume

28

Issue

4 SUPPL.

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