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

摘要

An experiment was carried out to study the outcome of environmental factors (Temperature, Relative Humidity, Rainfall) and 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. In the experiment, the purple blotch disease surfaced at the end of January 2016 and was severe in late February to March (PDI 76.12%) due to temperature and RH above 24 °C and 95%, respectively. As for the chemical control, the PDI for the treatments ranged from 50.66% to 83.33%. Significantly higher stem height was recorded by T _( 4 ) (68.06 cm), where six sprays of Rovral + Ridomil were applied. The minimum stem height was recorded in T _( 5 ) (59.23 cm). The maximum stem number per hill was recorded in T _( 4 ) (2.30) numerically but differed significantly with T _( 5 ) (2.00), where fungicides were not applied. The maximum lesion area was measured in T _( 5 ) (25.26 mm ~( 2 ) ). Regarding PDI (Percent disease index), there was a significant difference among the treatments. The PDI value on purple blotch of onion ranged from 34.00 to 83.33. The lowest PDI was assessed in T _( 4 ) (34.00). Statistical analysis revealed that a significant decrease of PDI on purple blotch was recorded under treatments of T _( 1 ) , T _( 2 ) , T _( 3 ) , and T _( 4 ) (39.20 % , 45.60 % , 49.59 % , and 59.19%) on controlling the disease and giving the optimum yield but all of them significantly differed with T _( 5 ) (83.33%) where no fungicides were sprayed.