Slow mildewing in Pumpkins: an opportunity to reduce Pumpkin yield losses caused by Erysiphe cichoracearum

 
 
 
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  • Abstract


    Pumpkin powdery mildews, a disease caused by fungus Erysiphe cichoracearum, is one of the major diseases that reduce yield and quality of pumpkins. A field screening study involving fifty two pumpkin accessions was carried out at three powdery mildew hot spot sites in Malawi. The main objective was to assess the reactions of pumpkin accessions to E. cichoracearum. The experiment was laid out in a randomized complete block design replicated three times. Plot size was 3m x 3. 7m. There were statistically significant differences in apparent infection rates (P<0.001), area under disease progress curve, AUDPC (P<0.001), percent disease index, PDI (P<0.001) among the accessions across all sites. Pumpkin accessions 6 and 42 consistently showed slow rate of powdery mildew development at 4th, 6th, and 8th week after germination. A strong positive correlation (R= 0.7 at 8th week, and 0.97 at 12th week after germination) was observed between the number of rotten fruits and AUDPC. This study showed that out of the fifty two pumpkin accessions tested, none was immune to Erysiphe cichoracearum. However the accessions that recorded very slow rate of powdery mildew development showed high potential to maintain viable vines and support their fruits up to physiological maturity. We concluded that promoting slow mildewing pumpkin genotypes is appropriate solution to fruit yield and quality losses caused by E. cichoracearum.


  • Keywords


    Accession; Powdery Mildew; Pumpkin; Erysiphe Cichoracearum; Screening; Malawi.

  • References


      [1] Ashok, K and Mishira S.P. 1988. Slow mildewing in pea. Indian Phytopathology, 29(4): 261-264.

      [2] Ashok, K., and Mishira S.P. 1989, Mechanism of slow mildewing in pea. Indian Phytopathology, 42: 103-107.

      [3] Biju, C.N. 2000. Studies on powdery mildew of pea (Pisum sativum L.) caused by Erysiphe polygoni DC. M.Sc. Thesis, Dharwad University of Agricultural Sciences.

      [4] Cannon, P. F. and Kirk, P. M. 2007. Fungal Families of the World. Commonwealth, United Kingdom. Available on-line at http://www.cabi.org/ [Accessed on 26th October, 2010].

      [5] Centre for Agricultural Bioscience International, 2006. Cucurbit aphid borne yellow virus in Egypt. Phytoparasitica, 2: 177-184.

      [6] David T. H. and James F. D. 2008. Management alternatives for powdery mildews on pumpkin. University of Maine. Available on-line at http:// www.attra.ncat.org/attra-pub/cucumberbeetle.html or at http://www.attra.ncat.org/attra-pub/PDF/cucumberbeetle.pdf [Accessed on March 16, 2010]

      [7] Giladi, E. 1983. The amount of systemic fungicide, triadimefon required in pepper leaves for the control of Leveillula taurica (Lev.) Arn, Ph.D. Thesis, Herbrew University Jerusalem.

      [8] Gupta, R.P. 1990, Evaluation of slow mildewing resistant varieties of peas in the field. Indian Journal of Pulses Research, 3:1

      [9] Kirk, P.M. Cannon, P.F. Minter, D.W. 2008: Dictionary of the Fungi. Available on-line at http://bookshop.cabi.org/Uploads/Books/PDF/.../9780851998268.pd.[Accessed on 13th May, 2010].

      [10] Naqvi, S.A.M.H. (Ed), 2004. Diseases of Fruits and Vegetables: Diagnosis and Managent 1: 52.

      [11] Palti, J. 1971. Biological characteristics, distribution and control of Leveillula taurica (Lev.).Phytopathology Mediterranean, 10: 139-153.

      [12] Parry and David W. 1990. Plant pathology in agriculture. Cambridge University Press.

      [13] Restrepo, S.J.A. and Valejo, CFA. 2008. Molecular characterization of Colombian introductions of squash, Cucurbita moschata. Acta Agron. UniversidadNacional-de Colombia, 57 (1): 9-17.

      [14] Rogers, J. L. and Nice wander, W. A.1988. Thirteen ways to look at the correlation coefficient. The American Statistician, 42(1): 59-66. http://dx.doi.org/10.2307/2685263.

      [15] Shanner, G. 1973. Reduced infection and inoculum production as factors of slow mildewing. Phytopathology, 63: 1307-1311. http://dx.doi.org/10.1094/Phyto-63-1307.

      [16] Snapp. S and Barry P. 2008. Agricultural Systems: Agro ecology and Rural Innovation for Development. University of Nebraska.

      [17] Stigler and Stephen, M. 1989. "Mathematical Statistics in the Early States". In Peter Duren. A Century of Mathematics in America. III. Providence, RI: American Mathematical Society.

      [18] Tooley, P.W. and Grau, C.R.1984. The area under the disease progress curve (AUDPC).Phytopathology, 74: 1201-1208. http://dx.doi.org/10.1094/Phyto-74-1201.

      [19] Van der Plank, J.E. 1963. Plant diseases: Epidemics and control. Academic Press, Inc. New York and London.

      [20] Venkatrao, M. 1997. Studies on powdery mildew of green gram (Vigna radiata). Indian Academy of Sciences, Archives of Biochemistry, 16: 131-141.

      [21] Wang, 2010. The biological identification of tobacco mosaic virus on watermelon. Journal of Anhui Agricultural Sciences:2003-06

      [22] Wheeler, B.E.J. 1969. Introduction to plant diseases. John Wiley and Sons Ltd.

      [23] Whitaker, T. W. and Davis, G. N. 2010. Cucurbits botany, cultivation and utilization. Ajay book service. Indian Books on Botany. Available on-line at http://www.kkagencies.com [Accessed on May 4, 2010]

      [24] Wichura and Michael J. 2006. The coordinate-free approach to linear models. Cambridge Series in Statistical and Probabilistic Mathematics. Cambridge: Cambridge University Press.

      [25] Winsor, G., Adams, P., Fiske, P. and Smith, A. 1987. Diagnosis of mineral disorders in plants. Glasshouse crops, 3:168. Available on-line at http://www.cabdirect.org/abstracts/19871913114.htm [Accessed on February 7, 2010]

      [26] Winston, M.O. and Thompson, 2011. The Whitefly, Bemisia tabaci (Homoptera: Aleyrodidae) Interaction in Cucurbits. Amazon.com Textbooks Store. Available at http://www.amazon.com[Accessed on February 9, 2010]

      [27] Yarwood, C.E. 1952. Some water relations of Erysiphe polygoni conidia. Mycologia, 44: 506-522.

      [28] Yarwood, C.E. 1954, Temperature relations of powdery mildew. Hilgardia, 22: 603-622. http://dx.doi.org/10.3733/hilg.v22n17p603.

      [29] Zitter, T.A., Hopkins, D.L. and Thomas, C.E. 1996. Compendium of cucurbit diseases. The American Phytopathological Society (APS) Press, St. Paul (Minnesota).


 

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Article ID: 5462
 
DOI: 10.14419/ijbas.v5i1.5462




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