Diagnostic symptoms of diseases of apple and stone fruits

Diagnostic symptoms of diseases of apple and stone fruits

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  RESEARCH POSTER PRESENTATIONDESIGN © 2015 www.PosterPresentations.com APPLE STONE FRUITS Agriculture and Forestry University (AFU), Rampur, Chitwan Hem Raj Pant Department of Plant Pathology DIAGNOSTIC SYMPTOMS OF DISEASES OF APPLE AND STONE FRUITS Symptoms  Minute, circular, olive- green spots on leaves, often along the vein  lesions in leaves and fruit are generally blistered and scabby in appearance 1. Apple scab Etiology: Venturia inequalis 2. Powdery mildew Etiology: Podosphaera leucotricha Symptoms  Small, whitish felt-like patches of fungal growth  Infected blossoms shrivel and produce no fruit  Fruit surface become russetted or discoloured 3. Fire blight of apple Etiology: Erwinia amylovora Symptoms  Leaves becomes water soaked, then shrivel turn brownish to black in colour  Terminal twigs wilt from tip to downward 4. Bitter rot of apple Etiology: Colletotrichum gloeosporioides Symptoms  Lesions are circular, and turn a darker brown and sunken as they age  The rotten flesh is typically watery & appears v-shaped in cross section 5. Black rot/Black rot canker Etiology: Botryosphaeria obtusa Symptoms  Small purple specks on leaf upper surfaces which later have tan to brown center & give frog eye appearance  Lesion on mature fruit enlarge rapidly becoming black and irregular in shape 6. Sooty blotch & flyspeck Etiology: Phyllachora pomigena & Schizothyrium pomi Symptoms  Sooty blotch appears on fruit surfaces as sooty and cloudy blotches with indefinite borders  Flyspeck as sharply defined, small, black, shiny dots in groups Symptoms  Fruit covered with powdery masses of tan spores  Spores may form concentric circles on the surface of fruit 1. Brown rot of stone fruits Etiology: Monilinia fructigena Symptoms  On leaves dark brown, scatterd lesions enlarge rapidly and abscission of diseased area results in shot hote  Snall circular, deep purple, raised spots on fruits 2. Shot hole/Coryneum blight of stone fruits Etiology: Wilsonomyces carpophilus 3. Verticillium wilt of stone fruits Etiology: Verticillium albo-atrum & V. dahliae Symptoms  .Yellowing and sudden wilting of leaves in late summer  On cherry, dieback and leaf death occurs 4. Crown gall of pome and stone fruits Etiology: Agrobacterium tumifaciens Symptoms  Small, round, whitish, soft overgrowths on the stem and roots  As tumor enlarge, their surface become convoluted and other tissues become dark brown 5. Rust of stone fruits Etiology: Tranzschelia discolour Symptoms  Symptoms on leaves start as pale yellowish spots on both surfaces which later change into bright yellow islands prominents on the upper surface 6. Peach leaf curl Etiology: Taphrina deformans Symptoms  Reddish area on developing leaves  These areas becomes thickened and puckered  Thickened areas turn yellowish, then grayish white & finally leaves turn yellow or brown