<i>In-Vivo</i>Management of Purple Blotch of Onion Caused by <i>Alternaria porri</i>(Ellis) Cif. through Fungicides

• 作者: Fatema Begum K. M. Fakruzzaman Md. Mozidul Islam Nazmoon Nahar U. A. Habiba
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Purple Blotch Alternaria porri Fungicides PDI Yield
• 年，卷（期）: mgzwxqkyw_2020,（11）
• 页码范围: 1847-1859
• 页数: 13页
• 分类号: O17

摘要

An experiment was carried out to study the outcome of environmental factors (Temperature, Relative Humidity, Rainfall) and<span style="font-family:;" "=""> </span><span style="font-family:Verdana;">management of the purple blotch disease of onion using five treatments (Rovral + Ridoil gold with 3,4,5,6 sprays and control). The Taherpuri variety was used during the 2015-2016 cropping seasons at BARI, Gazipur, Bangladesh.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">In the experiment, the purple blotch disease surfaced at the end of January</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">2016 and was severe in late February to March (PDI 76.12%) due to temperature and RH above 24</span><span style="font-family:Verdana;">°C and 95%, respectively.</span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">As for the chemical control, the PDI for the treatments ranged from 50.66% to 83.33%.</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">Significantly higher stem height was recorded by T</span>_{<span style="font-family:Verdana;">4</span>}<span style="font-family:Verdana;"> (68.06 cm), where six sprays of Rovral + Ridomil were applied. The minimum stem height was recorded in T</span>_{<span style="font-family:Verdana;">5</span>}<span style="font-family:Verdana;"> (59.23 cm). The maximum stem number per hill was recorded in T</span>_{<span style="font-family:Verdana;">4</span>}<span style="font-family:Verdana;"> (2.30) numerically but differed significantly with T</span>_{<span style="font-family:Verdana;">5</span>}</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">(2.00), where fungicides were not applied. The maximum lesion area was measured in T</span>_{<span style="font-family:Verdana;">5</span>}<span style="font-family:Verdana;"> (25.26 mm</span><sup><