Compatibility Study of Trichoderma Isolates with Fungicides against Damping-off of Cauliflower and Tomato Caused by Pythium aphanidermatum

In vitro studies have shown that Trichoderma harzianum isolates inhibited the growth of Pythium aphanidermatum up to more than 50 per cent. The compatible level of fungicide and plant product with T. harzianum isolates (Th-3 and Th-10) was determined to be 0.5, 50 and 2000 ppm, of Bavistin®, Captan® and Vegfrugard®, respectively. A spore concentration of 4x106 cells mL⁻¹ of the T. harzianum isolates and Captan® at 50 ppm was found to be the optimum for integrated seed treatment. This resulted in more than 80% seed germination; highest plant vigour and better rhizosphere colonization over control.