International Journal of Plant Protection

Yashoda R. Hegde ¹, Neelkanth S. Hireman ¹, Rajalaxmi S. Keshgond ¹, Tippeshi L. Chavhan ¹

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

Abstract

Jatropha curcas is gaining importance as a biodiesel crop. Among the different diseases affecting jatropha, collar rot caused by Botryodiplodia theobromae is an important one. Very little information is available on the management aspects of this disease. Therefore, different contact, systemic and combi product fungicides were evaluated against Botryodiplodia theobromae. Among the different fungicides tested, mancozeb and propineb (contact), propiconazole and carbendazim (systemic) and Quintal and Saaf (combi product) were found to effective to manage the pathogen under in vitro conditions.

Keywords

Jatropha Curcas, Collar Rot, Fungicides, Management

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K. Sumangala ¹, S. Lingaraju ², Yashoda R. Hegde ³

Affiliations
1 Department of Horticultural Plant Pathology, K.R.C.College of Horticulture, Arabhavi Karnataka, IN
2 Department of Plant Pathology, College of Agriculture, University of Agricultural Sciences, Dharwad Karnataka, IN
3 Department of Plant Pathology, College of Agriculture, University of Agricultural Sciences, Dharwad Karnataka

Abstract

Twenty three isolates of Fusarium oxysporum f. sp. lycopercici were collected from major tomato growing areas of Karnataka. They produced three kinds of spores, viz., microconidia, macroconidia and chlamydospors. Mycelia of the pathogen were white cottony to pink often with purple tinge or reddish colouration of the medium. Total isolates were assigned into three groups, on the basis of colony diameter, colony characters, sporulation and degree of pathogenicity. Isolates Fol-1, Fol-4, Fol-6 Fol-9, Fol-11, F ol-13, Fol-15 and Fol-21 showed abundant aerial mycelium and sporulation with maximum colony diameter (75 to 90.0 mm). They showed strong virulence with 75 per cent severity and wilting symptoms were noticed 14 days after inoculation.

Keywords

Tomato, Fusarium Oxysporum F. Sp. Lycopercici, Cultural, Pathogenic Variability

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Sreedevi S. Chavan ¹, Yashoda R. Hegde ²

Affiliations
1 Department of Plant Pathology, University of Agricultural Sciences, Raichur Karnataka, IN
2 Department of Plant Pathology, University, of Agricultural Sciences, Dharwad Karnataka, IN

Abstract

Stevia is an important medicinal plant used as a low calorie sweetener. Sclerotium wilt caused by Sclerotium rolfsii is an important disease and is a major constraint in stevia cultivation. Evaluation of the biocontrol agents indicated that maximum inhibition of mycelial growth of S. rolfsii (78.51%) was noticed in Trichoderma harzianum (Dharwad isolate). Among botanicals tested, Durantha was highly effective at 10 per cent (75.14) followed by Glyrecidia (72.14%).

Keywords

Stevia, Sclerotium Rolfsii, Duranta Repens, Trichoderma Harzianum

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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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