Int. J. Biosci.16(3), 173-183, March 2020
Downy mildew of onion is the most damaging disease of onion and is the major cause of reduction in yield in Pakistan. In current study for management purpose ten varieties of onion and five fungicides namely Shincar, Tilt, Ridomil gold, Rally and Curzate M at three concentrations ( 1,1.5 and 2g/liter of water) were evaluated under Randomized Complete Block Design. Among ten varieties only two varieties (1122F1hyb, SV.0748NP) expressed resistant response towards Downy mildew with 7.5-8.5% incidence. Among fungicides Shincar exhibited maximum reduction in incidence of disease (30, 55, and 85%) at three concentrations respectively. As environmental factors play a critical role in disease development and disease dispersal. So, in the current study their relationship with varieties in disease development was monitored. It was found that environmental factors have significant positive correlation at 5% (P) level. Characterization of epidemiological factors indicated that with increase in max temperature (20-26oC), minimum temperature (10-15oC), Relative humidity (64-80 %) and wind speed (3-6Km/h), disease also increased. These results are helpful for farmers, researchers and scientists for timely management of Downy mildew to save their onion crop from the harms of Downy mildew.
Ahmad S, Khan H. 2001. Influence of host management on downy mildew control in onion. Pakistan Journal of Biological Sciences 4, 1126-1128.
Araujo ER, Alves DP, Knoth JR. 2017. Weather-based decision support reduces the fungicide spraying to control onion downy mildew. Crop protection 92, p 89-92.
Araujo ER, Resende RS, Alves DP, Higashikawa FS. 2020. Field efficacy of fungicides to control downy mildew of onion. European Journal of Plant Pathology 156(1), p 305-309.
De Visser CLM, Van den Berg W. 1998. A method to calculate the size distribution of onions and its use in an onion growth model. Scientia Horticulturae 77(3-4), p 129-143.
Dini I, Tenore GC Dini A. 2008. Chemical composition, nutritional value and antioxidant properties of Allium caepa L. Var.tropeana (red onion) seeds. Food chemistry 107, 613-621.
Fujiwara K, Fujikawa T, Kawakami A, Sonoda R, Miyasaka A. 2019. RNA sequence analysis data of Peronospora destructor maintained on onions. Data in brief 22, p 693-696.
Gilles T, Phelps K, Clarkson JP, Kennedy R. 2004. Development of MILIONCAST, an improved model for predicting downy mildew sporulation on onions. Plant disease 88, 695-702.
Gisi U, Sierotzki H. 2008. Fungicide modes of action and resistance in downy mildews. In The Downy Mildews-Genetics, Molecular Biology and Control (p 157-167). Springer, Dordrecht.
Gurjar SM, Ali S, Akhtar M, Singh KS. 2012. Efﬁcacy of plant extracts in plant disease management.
Hanaa F, Zeinab A, Dawlat A, Mervat A, HAM S. 2011. Effect of neem and willow aqueous extracts on Fusarium wilt disease in tomato seedlings: 1-induction of antioxidant defensive enzymes. Arab Universities Journal of Agricultural Sciences 19, 131-140.
Hildebrand PD, Sutton JC. 1982. Weather Variables in Relation to an Epidemic of Onion Downy Mildew. Phytopathology 72(2), p 219-224.
Ikeda H, Kinoshita T, Yamamoto T, Yamasaki A. 2019. Sowing time and temperature influence bulb development in spring-sown onion (Allium cepa L.). Scientia Horticulturae 244, 242-248.
Imtiaj A, Lee T. 2008. Antagonistic effect of three Trichoderma species on the Alternaria porripathogen of onion blotch. World Journal of Agriculture Sciences 4, 13-17.
Kabura BH, Musa B, Odo PE. 2008. Evaluation of the Yield Components and Yield of Onion (Allium сера L.)-Pepper (Capsicum annuumL.) Intercrop in the Sudan Savanna. Journal of Agronomy 7(1), p 88-92.
Koike ST, Henderson DM, Butler EE. 2001. Leaf spot disease of spinach in California caused by Stemphyliumbotryosum. Plant Disease 85, 126–130.
Kumar TP. 2007. Biological management of Alternaria blight of onion. UAS, Dharwad.
Meena P, Meena R, Chattopadhyay C, Kumar A. 2004. Identification of critical stage for disease development and biocontrol of Alternaria blight of Indian mustard (Brassica juncea).Phytopathology 152, 204-209.
Mishra R, Jaiswal R, Kumar D, Saabale P, Singh A. 2014. Management of major diseases and insect pests of onion and garlic: A comprehensive review. Journal of Plant Breeding and Crop Science 6, 160-170.
Premila A, Sophiarani Y. 2015. Downy Mildew of Onion: Epidemiological Aspects.
Raziq F, Alam I, Naz I, Khan H. 2008. Evaluation of fungicides for controlling downy mildew of onion under field conditions. Sarhad Journal of Agriculture 24, 85.
Schwartz HF, Mohan SK. 2008. Compendium of onion and garlic diseases. APS Press, the American Phytopathological Society, St. Paul, MN
Sharma SR. 1997. Effect of fungicidal on purple blotch and bulb yield of onion. Indian Phytopathology 39, 78-82.
Shigyo M, Kik C. 2008. Onion, Vegetables II. Springer, p 121-159.
Surviliene E, Valiuskaite A, Raudonis L. 2008. The effect of fungicides on the development of downy mildew of onions. Žemdirbystė–Agriculture 95(3), p 171-179.
Trdan S, Valic N, Zezlina I, Bergant K, Znidarcic D. 2005. Light blue sticky boards for mass trapping of onion thrips, Thripstabaci Lindeman (Thysanoptera: Thripidae), in onion crop.Journal of Plant Disease Protection 112, 173-180.
Tripathy P, Priyadarshini A, Das SK, Sahoo BB, Dash DK. 2013. Evaluation of onion (Allium cepa L.) genotypes for tolerance to thrips (Thripstabaci L.) and purple blotch (Alternaria porri(Ellis) Ciferri). International journal of Bio-resource and Stress Management 4(4), p 561-564.
Wani AH, Nisa TU. 2011. Management of black mold rot of onion. Mycopath 9, 43-49.
Wright KH, Pike OA, Fairbanks DJ, Huber CS. 2002. Composition of Atriplexhortensis, sweet and bitter Chenopodium quinoa seeds. Journal of Food Science 67(4), p1383-1385.
Zahid YN, Abbasi AN, Haﬁz AI, Hussain A, Ahmad Z. 2012. Antifungal activity of local fennel (Foeniculumvulgare Mill.) extracts to growth responses of some soil diseases. African Journal of Microbiology Research 6, 46–51.