Poster Session: Chemical Control

202-P

Management of foliar nematodes, Aphelenchoides fragariae, in ornamentals.
J. A. LAMONDIA (1)
(1) Connecticut Agricultural Experiment Station, Windsor, CT, U.S.A.

Greenhouse experiments were conducted to determine the efficacy of Avid (abamectin), Azatin (azadirachtin), Kontos (spirotetramat), MeloCon (Paecilomyces lilacinus Strain 251), Neemix 4 (azadirachtin), NI-108X (biological), Pylon (chlorfenapyr), Safari 20SG (dinotefuran), and Proclaim (emamectin benzoate) against foliar nematode infection. Treatments were applied to foliage of four plants each of Anemone sylvestris ‘Serenade’ and ‘Pamina’ until runoff. Kontos was also applied as a soil drench. Kontos and Pylon foliar sprays were re-applied after 4 weeks. Aphelenchoides fragariae from naturally infected Salvia greggii leaves were inoculated 2 days after treatment to pre-wet foliage (18,000 viable nematodes per plant) using a hand-held sprayer. Anemone leaves were sampled and nematodes recovered after 4, 8 or 12 weeks. Data were analyzed by Kruskal-Wallis one-way Analysis of Variance. Numbers of A. fragariae extracted from Serenade were low and there were no differences between treatments. The lowest nematode numbers recovered from Pamila were observed in the Pylon, Neemix, Kontos drench and Avid treatments with 26, 149, 337, and 352 A. fragariae per plant, respectively (P = 0.03). The NI 108X biological and untreated controls had the highest populations, with 20,911 and 8,085 A. fragariae per plant, respectively. No treatments were free of nematodes after 2 to 3 months; for practical management of A. fragariae, multiple applications of efficacious materials may be required in combination with sanitation.