Abstract
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 T4 (68.06 cm), where six sprays of Rovral + Ridomil were applied. The minimum stem height was recorded in T5 (59.23 cm). The maximum stem number per hill was recorded in T4 (2.30) numerically but differed significantly with T5 (2.00), where fungicides were not applied. The maximum lesion area was measured in T5 (25.26 mm2). 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 T4 (34.00). Statistical analysis revealed that a significant decrease of PDI on purple blotch was recorded under treatments of T1, T2, T3, and T4 (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 T5 (83.33%) where no fungicides were sprayed.
Highlights
Onion (Allium cepa L.) is the most important and familiar spice throughout the world
Statistical analysis revealed that a significant decrease of percent disease index (PDI) on purple blotch was recorded under treatments of T1, T2, T3, and T4 (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 T5 (83.33%) where no fungicides were sprayed
During the 2015-16 crop season, the subsequent disease development of purple blotch of onion caused by Alternaria porri was assessed at eight days interval on five dates of observations (01. 02. 16, 09. 02. 16, 17. 02. 16, 25. 02. 16 and 05. 03.16)
Summary
Onion (Allium cepa L.) is the most important and familiar spice throughout the world. It is the most common spice in Bangladesh and used as a popular vegetable. Bunching onion (Allium fistulosum) is becoming a popular vegetable in Bangladesh. It does not form bulbs but grows in clusters of long white stems [1]. It is an essential vegetable in Australia, Belgium, India, Japan, the United Kingdom, the USA, and some other countries. Bulb onion is still the most popular here. In Bangladesh, due to lack of any popular high yielding variety, still, local variety Taherpuri and Faridpurbhatti are commonly grown throughout the country
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