A comparison of in vitro and in vivo effects of clay minerals, humic acid and micronutrients on the activity of fungicides against Rhizoctonia solani

摘要: Activity of nine fungicides against mycelial growth ofRhizoctonia solani in potato dextrose broth and pot tests as seed treatment cowpea seedling rot infested soil was differentially fluenced by clay minerals, humic acid micronutrients. Humic acid, extracted from farmyard manure, considerably lowered the activity, bothin vitro andin vivo, all except chloroneb. Montmorillonite caused substantial decrease disease control but enhanced toxicity 2-methoxyethyl mercury chloride (MEMC), quintozene culture. Kaolinite inactivated carbendazim, benomyl thiophanatemethyl nutrient had little effect on these fugicides. The six micronutrients altered activity to varying levels often without definite correlation betweenin vivo results. results ofin inhibition are largely inapplicable dieseas mainly due differences ambient conditions two systems.