Vol. 2, Issue 5 (2017)
Efficacy of some chemical fungicides against fusarium wilt of sunflower in-vtro condition Couse by Fusarium oxysporum
Author(s): Azizullah Keerio, Zubair Ahmed Nizamani, Shahid Hussain, Muhammad Rafiq, Sohail Iqbal, Azhar-ud-Din Keerio
Abstract: Sunflower (Helianthus annuus L) is an important member of the family Asteraceae. Presently sunflower has become the most important oil crop of Pakistan after canola. The results of studies showed that, different fungi were associated with the wilted parts (viz., roots, stems leaves and flower heads) of sunflower. Most frequent and pre-dominant fungi were isolated and identified as Fusarium oxysporum, Fusarium moniliforme, Alternaria helianthi and Aspergillus niger. Among all the isolates, Fusarium oxysporum remains most frequent and pre-dominant fungus and was identified on the bases of their morphological characteristics. Statistical analysis of the data reveals that most of the used fungicides significantly reduced the mycelial mass of Fusarium oxysporum (p<0.0000). Among all tested fungicides, Nativo was found more effective in reducing the linear colony growth of the fungus at its highest and lowest doses (7.00mm), followed by Alliete (16.1 mm), whereas, Cabriotop and Romeo found less effective as compared to Nativo and Alliete. Dragon was found very less effective as compared to other four fungicides which reduce the linear colony growth of the tested fungi, at its highest dose (64.467 mm). All the fungicides at their respective doses significantly retarded the growth of fungus as compared to control (81.00mm).