Evaluation of Microbial Biocontrol Agents and Fungicides against Alternaria helianthi Causing Leaf Blight of Sunflower

Biological Control of Alternaria Leaf Spot Caused by Alternaria spp. in Jerusalem Artichoke (Helianthus tuberosus L.) under Two Fertilization Regimes

“…Similarly, T. harzianum was less effective to suppress Fusarium wilt in banana [22] and in tomato, only two of five isolates of T. harzinum inhibited growth of S. rolfsii according to in vitro and greenhouse trials [23]. Several contrasting reports include that T. harzianum reduced the disease incidence of Alternaria leaf spot more than 40% in bean [24], whereas in sunflower, Trichoderma viride reduced leaf spot severity caused by Alternaria helianthi more than 20% and increased seed yield [13]. The results of this study demonstrate the different efficacy of Trichoderma to control the disease depended on genotypes.…”

“…In addition, biocontrol methods against Alternaria leaf spot can provide alternatives to synthetic chemical fungicides that are much less damaging to people and the environment. Trichoderma includes several species that have been reported to be effective for control of Alternaria leaf spot in sunflower [13], aloe vera ( Aloe vera ) [14], peanut [15], and chili [16]. In peanut, Trichoderma inhibited Alternaria alternata mycelia growth in vitro and suppressed disease development index under field condition, but less effective than conventional fungicide control [15].…”

Eco-friendly Management of Leaf Spot of Brinjal (Solanum melongena L.) caused by Alternaria spp

“…Similar findings was given by Ravishanker et al,(2018) that by using bio agents and combinations in in-vivo and in-vitro conditions, Trichoderma viride, Pseudomonas fluorescens and neem oil and their combinations the results shows the combination of bio agents had a great impact in controlling the blight disease of Alternaria blight followed by fungicide. Vijayalakshmi et al, (2018) reported maximum inhibition of radial growth of A. helianthi was observed in T. viride (85.33%) which was followed by T. viride strain 16 (79.33%), and T. harzianum. Bagwan (2010) results given that, neem oil (5%), neem leaves extract (10%), wild sorghum leaves extract (10%), neem cake, castor cake and mustard cake extract (10%) enhanced the growth of Trichoderma.…”

Control integrado de Alternaria alternata en Amaranthus mantegazzianus

“…En relación al control de manchas foliares ocasionadas por Alternaria, diversas especies de Trichoderma han sido reportadas en girasol (Vijayalakshmi et al, 2018), maní (Ajayabhai et al, 2018) y pimiento (Begum et al, 2010). Surekha et al (2013) demostraron que semillas cubiertas con esporas de T. viride redujeron la incidencia y la severidad del tizón de Alternaria.…”

“…El difenoconazole en la concentración intermedia (500 ppm) y máxima (700 ppm) controló en promedio el crecimiento micelial de A. alternata en un 30,77 % (Tabla 2.4), siendo inferior a lo hallado por Rajput y Chaudhari (2018), que con concentraciones de 250, 500 y 1000 ppm obtuvieron una efectividad del 100 % de control en las colonias de A. alternata en el tizón de la papa y a Vijayalakshmi et al (2018), que con una concentración de 500 ppm controló un 68 % del desarrollo micelial de A. helianthi.…”