Abstract:

In order to study the pathogen causing dry rot of Schefflera actinophylla and its proper fungicides to instruct production, the pathogen was identified and toxicity of its fungicides was tested. Dry rot of Schefflera actinophylla was identified via morphology and rDNA internal transcribed spacer sequencing. The result showed that the disease was caused by Lasiodiplodia theobromae. Toxicity of eight fungicides to L. theobromae was tested by measuring mycelium growth rate. The result showed that carbendazim 50% WP had the best inhibition to the growth of L. theobromae, which EC50 was 0.02 μg/mL. Prochloraz 45% EW, tebuconazole 43% SC, difenoconazole 10% WG and propiconazole 25% EC also exhibited significant inhibition to the growth of L. theobromae, the EC50 of four fungicides were less than 1 μg/mL.