Background: Multiplier onion is one of the most important crops of Tamil Nadu. It is having lot of health benefits like anti-inflammatory, anti cholesterol, anticancer and antioxidant properties, lowering the toxigenicity of oils. It also shows chemo preventive effects and lowers down the risk of effect on gastric cancer. Considering the importance of multiplier onion an attempt was made to evaluate the multiplier onion genotypes to identify the best yielding genotype. Methods: Seven genotypes of multiplier onion (Allium cepa var aggregatum) were evaluated under Northern transitional zone of Karnataka at University of Agricultural Sciences, Dharwad both during Kharif and Rabi for yield and quality parameters. Results: The outcome of the experiment revealed that over the seasons, the genotype MP16-24 was registered highest total yield (167.86 q/ha), marketable yield (160.41q/ha), TSS (15.41), average bulb weight (4.64g)and less number of bolters, low infestation of thrips (7.83) and purple blotch (7.66). Therefore, the genotype MP 16-24 can be commercially grown under Dharwad conditions during both Kharif and Rabi because of its favorable characters.

Garlic is an herbaceous annual bulbous plant in the family Amaryllidaceae grown for its pungent and edible bulb. Among the various biotic factors hindering production and productivity, purple blotch plays a predominant role in changing the crops morpho-physiological characters, thus deteriorating the metabolic activity in turn affecting the yield considerably. Fungicides have been recommended for the control of the disease, however use of fungicides is expensive and not eco-friendly. The best approach to control the disease is by using resistant genotypes. Hence, 37 genotypes were field screened at AINRPOG (All India Network Research Project on Onion and Garlic), MARS (Main Agricultural Research Station), Dharwad against purple blotch disease under artificial epiphytotic conditions during Kharif in year 2019 to identify the resistant sources. The results revealed that twenty genotypes were found to be resistant (1-10%) and five genotypes were immune (0%) however, ten genotypes were found moderately resistant (11-20%) in reaction. The remaining two genotypes viz., HRG Local and DOGR409 were found moderately susceptible (21-40%) with a maximum grade of 3 on (0-5) scale. None of the genotypes showed susceptible or highly susceptible reactions to purple blotch. Breeders can make use of these identified resistant lines in developing high yield purple blotch disease resistant varieties.

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Purple blotch (Alternaria porri) is one of the major diseases of garlic causing huge loss to the growers. An investigation was undertaken to formulate suitable management practices against purple blotch of garlic var. DWG1. Among the various treatments, seed treatment with Trichoderma harzianum @ 10 g/kg of cloves and two foliar applications of fluopyram 17.7% + tebuconazole 17.7% @ 0.1% on 50 and 65 days after sowing recorded the minimum disease severity (13.34 PDI) and higher bulb yield (5.77 t/ha), 10 bulbs weight (83.00 g), number of cloves (15.67) and 100 cloves weight (65.33 g) with C:B ratio of 1: 3.51. The combined application of cow urine, nimbecidine and Trichoderma harzianum also showed significant impact on disease reduction as well as on yield of garlic. However, fluopyram 17.7% + tebuconazole 17.7% showed a higher benefit with minimum production cost and this approach is proposed to garlic growing farmers to mitigate the purple blotch disease. Bangladesh J. Bot. 52(2): 291-295, 2023 (June)