Efficiency of Some Bioagents and Potassium Humate in Controlling Tomato wilt Disease caused by Fusarium Oxysporum f.sp. Lycopersici

Abstract

Fusarium oxysporum f.sp. lycopersici (FOL) is one of the most important fungi causing vascular wilt disease of tomato plants. Many different agents i.e., Bacillus subtilis, Trichoderma harzianum, T. viride, alga (Sparulina platensis), Mycorrhiza (Glomus sp.) and potassium humate were investigated for their antagonistic effects on the growth of FOL in vitro. T. harzianum and potassium humate were the most effective treatments, followed by B. subtilis and alga extract. The previously mentioned treatments were studied under greenhouse conditions and natural infection in the field. T. harzianum and potassium humate were the most effective treatments against FOL followed by B. subtilis and alga extract. Mycrrohiza was the lowest effect treatment under greenhouse and field conditions. T. harzianum and potassium humate decreased the activities of hydrolyzing enzymes and increased all of total phenols and plant parameters (fresh, dry weight and length/ plant) of treated tomato plants.

Efficiency of some Organic Matter on Suppression of Soil-Borne Diseases of Tomato Plants under Organic Agriculture System

“…On the other hand, plant residue showed the lowest effect in comparison with the other treatments. These results are in harmony with those reported by Ahmed (2013) who came to the same conclusion when tomato plants were dealt with the effect of organic manure on vegetative growth, yield and chemical constituents (Tables, 1 and 2) it can improve soil physical and chemical properties and nutrient dynamics (Kumar et al, 2013;Ahmed et al, 2017 andAhmed et al, 2018). On the opposite trend, plant residue showed the least effective treatment compared to control treatment.…”

“…Obtained results are in agreement with those reported by Sullivan (2004) and Ahmed, 2013. In this respect, many investigators reported that under sandy soil conditions microbein fertilizer at 200g/acre gave the highest number of both leaves and branches/plant, dry weight of branches, leaves and total dry weight/plant. These results are in harmony with (Kumar et al, 2013;Ahmed, et al, 2018 andMorales-Corts et al, 2018) who explained the increase of fresh and dry weights of tomato plants which is a natural material that can improve soil physical and chemical properties and nutrient dynamics.…”

“…Fertilization of tomato plants with cattle, chicken manure or compost at rate of (120 kg N/fed.) gave highest values of crop parameters, plant chemical composition (Kumar et al, 2013;Mesallam et al, 2017 andAhmed, et al, 2018).…”