International Journal of Plant Protection

Poornima ¹, Yashoda R. Hegde ¹

Affiliations
1 Department of Plant Pathology, College of Agricultural Sciences, University of Agricultural Sciences, Dharwad (karnataka), IN

Abstract

Palak (Beta vulagaris var. bengalensis Hort.) is one of the most popular leafy vegetables widely grown in India. This crop is severely affected by leaf spot disease caused by Cercospora beticola leading to brown coloured spots on the leaves which hinders the market quality of the leaves. All media are not equally good for all fungi, nor there is a universal substrate or artificial medium, upon which all fungi can grow. So, different media including both synthetic and non-synthetic were tried for C. beticola in the present experiment. Cultural studies of C. beticola grown on different solid media showed that Potato dextrose agar and Oat meal agar were good for growth. Among the nine liquid media evaluated, maximum dry mycelial weight of the fungus was obtained in Soypeptone broth which was significantly superior to all other media. Temperature requirement of the fungus was found 25°C where good growth was observed.

Keywords

Cercospora Beticola, Cultural Characters, Palak

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Poornima ¹, Yashoda R. Hegde ¹

Affiliations
1 Department of Plant Pathology, University of Agricultural Sciences, Dharwad (karnataka), IN

Abstract

Leaf spot disease is one of the major diseases of palak caused by Cercospora beticola. Symptoms of the leaf spot disease of palak were noticed on both leaf and petiole. On leaf brown coloured spots with circular or irregular margin or straw coloured centre with brown margin were observed. On petiole, brown coloured lesions were noticed. To know the alternate hosts of C. beticola, five different leafy vegetables viz., Amaranthus spp. Beta vulgaris, Coriandrum sativum, Trigonella foetum graceam, Lactuca sativa were tested. Among these Amaranthus and Beta vulgaris showed the positive reaction to C.beticola and to know the susceptibility stage of the palak to C.beticola different ages of the plants like 7, 14, 21, 28, 35, 42, 49, 56, 63 days old plants were tested among these 28 days old plants showed the highest disease severity.

Keywords

Palak, Host range, Susceptible stage, Cercospora beticola

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Poornima ¹, Gururaj Sunkad ²

Affiliations
1 Department of Plant Pathology, AICRP (Sunflower), MARS, Raichur (Karnataka), IN
2 Department of Plant Pathology, University of Agricultural Sciences, Raichur (Karnataka), IN

Abstract

A technique was standardized to screen for resistance to stem rot (Sclerotium rolfsii Sacc.) in groundnut (Arachis hypogaea L.). A total of seven different inoculation techniques were screened by using susceptible genotype TMV-2. The techniques involved inoculation of 10 day old groundnut plants raised in pots by spreading mycelial propagules of S. rolfsii grown on sorghum grain medium (SGM) on soil surface, Inoculum spread on the soil surface and covered with groundnut leaf debris, Inoculum placed around the collar region, Inoculum placed around the collar region and covered with groundnut leaf debris, Inoculum mixed in the soil, Inoculum mixed in the soil and covered with groundnut leaf debris, Agar disc method. Among these techniques inoculum spread on the soil surface and covered with groundnut leaf debris was found to be most efficient in getting highest per cent incidence of stem rot (84.86%) and pod rot (70.48%).

Keywords

Groundnut, Stem, Pod Rot, S.rolfsii.

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