Abstract
Fungicides are an important tool used in the management of Botrytis elliptica on lilies. During 2011, 2012 and 2013, trials were conducted to determine the effectiveness of several reduced-risk and biocontrol fungicides in controlling B. elliptica on field-grown 'Elite' or 'London' Asiatic hybrid lilies. A total of 13 fungicides and an untreated check were included in these trials. Fungicides included iprodione (Chipco 26019 N/G), chlorothalonil (Daconil Weather Stik), fluoxastrobin (Disarm 480 SC), fludioxonil (Medallion 50WP), cyprodinil + fludioxonil (Palladium 62.5WG), pyraclostrobin + boscalid (Pageant 38 WG), thyme oil (Proud 3), extract of Reynoutria sachalinensis (Regalia), tebuconazole (Torque 3.6SC), metconazole (Tourney 50WDG), triticonazole (Trinity 2SC), fenpyrazamine (V10135 SC), and hydrogen dioxide + peroxyacetic acid (ZeroTol 2.0). Treatments were applied on 7, 10, or 14 day intervals with a CO2 sprayer equipped with an 8002 LP TEE-Jet nozzle at 1.1 kg/cm2 in the equivalent of 935.4 liters of water/ha. Applications were made during a 2 to 3 month period during the growing season and the experimental design was a randomized complete block with each treatment applied to a 0.9 m long section of row in each of five blocks. Results from these trials indicated that three fungicides, pyraclostrobin + boscalid, fludioxonil, and cyprodinil + fludioxonil, consistently reduced disease development. Of these, pyraclostrobin + boscalid was the most effective. Applications of the other products included in the trials were ineffective or inconsistent in controlling B. elliptica on lilies.
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