Effect of Pseudomonas fluorescens CHA0 and green manures of some inhibitory plants on activity of the root-knot nematode, Meloidogyne incognita and infected tomato growth parameters

Effect of 10% aqueous extracts of inhibitory plants viz. Plantago major, Ricinus communis, Eruca sativa and Tagetes sp. on Meloidogyne incognita activity and Pseudomonas fluorescens CHA0 was studied. The results showed that the extracts increased 31-42% mortality of the second stage juveniles and decreased 37.5-60.0% egg hatching of the nematode, but did not inhibit the bacterium growth. The combined effects of green manures of plants (12 g/kg of soil) and bacterium (cfu108) on activity of the nematode and growth parameters of tomato (Early Urbana) were studied in 3.5 kg pots, containing sterilized mixed or non-sterilized farm soils. The results showed that in presence of the nematode and in sterilized soil, marigold-bacterium with 66.2 and 60.9% increases, and in non-sterilized soil castor with 29.1 and 18.3% increases in shoot fresh and dry weights, respectively, had the highest impacts. Plantain-bacterium decreased 95.9 & 86.0% of eggs/g of root and 92.9 & 95.2% of nematode reproduction factor in sterilized or non-sterilized soils, respectively. In addition, plantain decreased 93.9 & 84.5% of eggs/g of root and 90.7 & 95.9% of nematode reproduction factor, respectively. The results of the greenhouse test on usage of eruca green manure and bacterium in 12 kg pots, containing sterilized mixed soil, showed that in the presence of nematode, eruca with 15.0, 2.2 and 48.3% increases in shoot fresh, shoot dry and fruit weights, respectively had the greatest impact. Moreover, eruca-bacterium decreased 55.2 and 52.4% of egg or gall/g root, respectively and 65.5% of reproduction factor.