Articles
INTEGRATED MANAGEMENT OF VIRAL SENSITIVITY OF ALTERNARIA SOLANI ISOLATES TO SOME FUNGICIDES
Article number
808_62
Pages
377 – 380
Language
English
Abstract
Six isolates of Alternaria solani, the causal agent of tomato early blight, collected from various tomato-growing areas in Serbia, were tested in vitro for sensitivity to six fungicides: chlorothalonil, copper-oxychloride, mancozeb, difenoconazole, iprodione and prochloraz.
The effective fungicide concentrations that inhibited mycelial growth by 50% (EC50) and their inhibitory activity were determined.
The tests showed that copper-oxychloride and chlorothalonil had the lowest toxicity to all investigated isolates.
Their respective EC50 values ranged between 109.72 – 173.32 mg L-1 and 40.47 – 162.94 mg L-1. Mancozeb was moderately toxic to all A. solani isolates with EC50 values from 9.79 to 24.35 mg L-1. The toxicity of iprodione, difenoconazole and prochloraz to all isolates was extremly high, their EC50 values ranging between 0.40– 0.80 mg L-1, 0.09 – 0.33 mg L-1 and 0.03 – 0.11 mg L-1, respectively.
The best inhibition of mycelial growth, exceeding 89.52%, was recorded in iprodione, prochloraz and difenoconazole treatments at a concentration of 100 mg L-1. The foregoing fungicides also had the highest inhibition at a concentration of 1 mg L-1, the respective values being 57.06 – 68.59%, 76.15 – 81.55% and 69.88 – 81.86%. Copper-oxychloride, chlorothalonil and mancozeb caused minor inhibition levels at the concentration of 1 mg L-1 (up to 26.98%). Among the fungicides investigated, iprodione, prochloraz and difenoconazole were the most toxic, while copper-oxychloride was the least toxic to all A. solani isolates.
The effective fungicide concentrations that inhibited mycelial growth by 50% (EC50) and their inhibitory activity were determined.
The tests showed that copper-oxychloride and chlorothalonil had the lowest toxicity to all investigated isolates.
Their respective EC50 values ranged between 109.72 – 173.32 mg L-1 and 40.47 – 162.94 mg L-1. Mancozeb was moderately toxic to all A. solani isolates with EC50 values from 9.79 to 24.35 mg L-1. The toxicity of iprodione, difenoconazole and prochloraz to all isolates was extremly high, their EC50 values ranging between 0.40– 0.80 mg L-1, 0.09 – 0.33 mg L-1 and 0.03 – 0.11 mg L-1, respectively.
The best inhibition of mycelial growth, exceeding 89.52%, was recorded in iprodione, prochloraz and difenoconazole treatments at a concentration of 100 mg L-1. The foregoing fungicides also had the highest inhibition at a concentration of 1 mg L-1, the respective values being 57.06 – 68.59%, 76.15 – 81.55% and 69.88 – 81.86%. Copper-oxychloride, chlorothalonil and mancozeb caused minor inhibition levels at the concentration of 1 mg L-1 (up to 26.98%). Among the fungicides investigated, iprodione, prochloraz and difenoconazole were the most toxic, while copper-oxychloride was the least toxic to all A. solani isolates.
Publication
Authors
M. Stepanovic, P. Vuksa, I. Potocnik, S. Milijasevic, E. Rekanovic, B. Todorovic
Keywords
early blight, tomato, inhibition, toxicity, in vitro
Online Articles (73)