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Premium member Presentation Transcript PowerPoint Presentation: Wel come PowerPoint Presentation: Diseases SOYBEAN (Glycine max) Rust : Phakopsora pachyrhizi Soybean mosaic virus Mosaic : Bacterial pustule : Xanthomonas axonopodis pv. glycines PowerPoint Presentation: SOYBEAN (Glycine max) Rust Phakopsora pachyrhizi PowerPoint Presentation: Symptoms Symptoms appear on all above ground parts of the plant. Large number of light brown pustules appears on lower surface of the leaves in the initial stages, later turns to reddishbrown to tan colour. Tan lesions consist of small uredia surrounded by slightly discolored necrotic areas on leaf surfaces. PowerPoint Presentation: Early stages show an ostiole , or small hole, where uredospores emerge. As uredia become larger, they release masses of tan colored uredospores that appear as light brown or white raised areas Uredial pustules become more numerous with advancing infection and often will coalesce forming larger pustules that break open releasing masses of uredospores. PowerPoint Presentation: The leaves gradually become yellow and premature defoliation occurs resulting in yield loss. Lesions are generally restricted by veins giving angular appearance. In Kharif crop, the disease appears in the first week of September coinciding with flowering or pod formation. PowerPoint Presentation: Early infection by Phakopsora pachyrhizi on a susceptible soybean PowerPoint Presentation: Phakopsora pachyrhizi : susceptible (TAN) lesions. PowerPoint Presentation: Phakopsora pachyrhizi : red brown (RB type) lesion with some sporulation. PowerPoint Presentation: Phakopsora pachyrhizi : red brown (RB type) lesion with some sporulation. PowerPoint Presentation: Phakopsora pachyrhizi : RB lesion with circular ostiole and spores. PowerPoint Presentation: Phakopsora pachyrhizi RB lesion with no sporulation. PowerPoint Presentation: Soybean rust pustules caused by Phakopsora pachyrhizi on the upper side of a soybean leaf. PowerPoint Presentation: Soybean rust pustules caused by Phakopsora pachyrhizi on a soybean cotyledon. PowerPoint Presentation: Soybean rust pustules caused by Phakopsora pachyrhizi on petioles. PowerPoint Presentation: Soybean rust pustules caused by Phakopsora pachyrhizi on stems. PowerPoint Presentation: Soybean rust pustules caused by Phakopsora pachyrhizi on the under side of a soybean leaf. PowerPoint Presentation: Disease cycle The disease is favoured by temperature of 18 to 230C and R.H of 80%. The pathogen survives as teleutospores in crop debris. Secondary spread is through wind borne uredospores. Favourable Conditions PowerPoint Presentation: Management Early maturing cultivars escape rust infection. Grow resistant varieties like PK 73-84, PK-310, IC 89495, IC 89498, etc. PowerPoint Presentation: Spray twice with Saprol (Triforine)@0.05%, Delan (Dithianon)@0.2% or Mancozeb@0.1% PowerPoint Presentation: Soybean mosaic Soybean mosaic virus PowerPoint Presentation: Symptoms Infected plants can be recognized by their stunted growth, distorted and puckered leaves. The leaves are dwarfed, crinkled and narrow with their margins turned downwards. PowerPoint Presentation: In severe cases, dark green blister like puckering along the veins takes place. Pod setting is drastically reduced. Infected plants produce distorted pods and fewer seeds. PowerPoint Presentation: The infected plants remain green even at the end of the growing season. Seed discolouration can be seen under severe infection. PowerPoint Presentation: Disease cycle The virus is seed borne and is transmitted by aphids. PowerPoint Presentation: Use virus free seed from healthy crop. Rogue out infected plants and burn them. Spray firstname.lastname@example.org/lt or dimethoate@2ml/lt to control the vector Management PowerPoint Presentation: Bacterial pustule Xanthomonas axonopodis pv. glycines PowerPoint Presentation: Xanthomonas axonopodis pv. glycines Bacterial pustule Symptoms Symptoms are evident as tiny, light green spots with elevated centers that later on turn into raised lightly coloured pustules, typically without exudates. Infection is more frequent on the lower ones. PowerPoint Presentation: Spots may vary from minute specks to large, irregular, mottled brown areas. Severely affected portions of leaves are torn away by wind imparting a ragged appearance to plants, and results in premature defoliation. PowerPoint Presentation: The disease reduces the yield as well as the oil content in seeds. Raised red brown spots on pods may also develop. PowerPoint Presentation: The bacterium survives in crop residue and seed The disease appears in a severe form when warm temperatures and frequent showers prevail during growing season. Disease cycle Favourable conditions PowerPoint Presentation: Remove and burn infected plant debris. Crop rotation with grain crop is recommended Management PowerPoint Presentation: Two sprays at 45and 55 DAS with a mixture of Blitox@0.2% + Streptocycline@250ppm You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.