Toxicity Measurement for Seven Fungicides to Phytophthora palmivora Butler in Zamioculcas zamiifolia

Laboratory toxicity tests of seven fungicides to Phytophthora palmivora Butler were carried out using the methods of mycelium growth.The results showed that 0.15% tetramycin AS had the best control effect,its EC50 was 0.0457 μg / mL and EC90 was 0.2174 μg / mL.However,6.25% metalaxyl-M + fludioxonil FS and 50% dimethomorph WDG also had the prominent effect.The former EC50 was 0.0758 μg / mL and EC90 was 2.4683 μg / mL.The latter EC50 was 0.3407 μg / mL and EC90 was 2.0794 μg / mL.And it also showed that 22.7% dithianon SC,80% mancozeb WP and 50% flumorph + fosetyl-aluminium WP had some inhibitory actions on mycelium growth.Their EC50 were 0.1382 μg / mL,2.3796 μg / mL and 5.4602 μg / mL.72.2% propamocarb hydrochloride AS showed poor results,its EC50 was 498 μg / mL.80% mancozeb WP had the high rate of costs and then was 50% dimethomorph WDG in the seven fungicides.