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Accueil du site → Master → Inde → 2018 → ASSESSMENT OF THE ROLE OF SOIL MOISTURE AND TEMPERATURE IN CAUSING DRY ROOT ROT BY Rhizoctonia bataticola (Taub.) Butler IN PIGEONPEA (Cajanus cajan (L) Millsp.)

Acharya N G Ranga Agricultural University, Guntur (2018)

ASSESSMENT OF THE ROLE OF SOIL MOISTURE AND TEMPERATURE IN CAUSING DRY ROOT ROT BY Rhizoctonia bataticola (Taub.) Butler IN PIGEONPEA (Cajanus cajan (L) Millsp.)

SHARATH CHANDRAN, U.S.

Titre : ASSESSMENT OF THE ROLE OF SOIL MOISTURE AND TEMPERATURE IN CAUSING DRY ROOT ROT BY Rhizoctonia bataticola (Taub.) Butler IN PIGEONPEA (Cajanus cajan (L) Millsp.)

Auteur : SHARATH CHANDRAN, U.S.

Université de soutenance : Acharya N G Ranga Agricultural University, Guntur

Grade : Master of Science in Agriculture 2018

Résumé partiel
Pigeonpea cultivation is subjected to high yield losses every year. Dry root rot or Macrophomina stem canker caused by Rhizoctonia bataticola (Taub.) Butler [synonym- Macrophomina phaseolina (Tassi) Goidanich] of pigeonpea is an emerging and serious problem in late sown or summer crops and in perennial or ratooned pigeonpea. A very little work has been done on dry root rot pathogen in pigeonpea crop. Keeping in mind the importance of this emerging disease with respect to changing climate, the present study involving cultural, morphological and pathological variability among the isolates, effect of temperature, moisture and pH on the growth and development of the pathogen and various biochemical alterations occurring with respect to disease development in pigeonpea was studied. All the investigations were conducted under laboratory and glasshouse during 2016-17 at Legumes Pathology Division, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad. Cultures of the R. bataticola of pigeonpea was procured from the Legumes Pathology division, ICRISAT. The isolates were sub-cultured, molecular characterized and serially designated as Rb1 to Rb10. Pathogenicity test against pigeonpea variety Bahar using paper towel technique as employed to find out the virulent isolates. Maximum disease severity rating of 8 was observed in Rb 6 inoculated plants followed by 7.3 in Rb 1 and Rb 4 inoculated plants. xiii Influence of different media, temperature and pH were tested on the growth of R. bataticola isolates. Carrot agar and PDA was found to support maximum colony growth of all the isolates. The optimum temperature for growth was found to be 35°C at par with 30°C. At 45°C no growth was observed even after 72 HAI. The optimum pH range for growth was found to be 5-7, where the maximum colony growth of 90.00 mm was attained at 48 HAI. At pH 3 and 9 the growth was drastically reduced.

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