ECO-FRIENDLY MANAGEMENT OF WILT OF POMEGRANATE CAUSED BY Ceratocystis fimbriata Ellis and Halst. THROUGH BIOAGENTS
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Date
2017-06-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
Pomegranate (Punica granatatum L.) severely affected by soil borne fungal pathogen (Ceratocystis fimbriata Ellis and Halst.) causing wilt. During survey in NEK, maximum wilt disease incidence was in Bijapur district (38.05 %) and least disease incidence in Ballari district (8.18 %) during 2016. Thirty three native isolates of fluorescent Pseudomonads and Trichoderma spp. screened against C. fimbriata for antagonistic activity. However, the per cent inhibition was higher (more than 50%) in eleven isolates. Among fluorescent Pseudomonads maximum per cent inhibition was observed in PFP-11 (72.06%) followed by PFP- 4 (71.90%) and least inhibition of mycelium was recorded in PFP-3 (53.93%). Among Trichoderma spp. isolates PT-11 (93.10%) maximum per cent inhibition followed by PT- 10 (92.03%) and least per cent inhibition was observed in PT-8 (78.63%). Eleven efficient isolates of fluorescent pseudomonads were showed positive results for the morphological characters such as fluorescence under UV light, yellowish green pigmentation and growth at 41ºC and isolates was showed negative for Gram’s reaction, spore production and growth at 4ºC and showed positive results for biochemical tests such as catalase test, KOH test, starch hydrolysis, gelatin liquefaction, Ureases test, casein test and Indole test. Superior eleven Trichoderma isolates were produced hyaline, septate mycelium with globose to oval conidia having light green to green color and having both lateral and terminal Chlamydospores. PFP-4, PFP-10 and PFP-11 showed strong production of HCN, strong chelators of siderophore production and IAA production while, PPF-1, PFP-2, PFP-3, PFP-8 and PFP-9 showed weak production. Among all isolates, PT-6 showed higher mean shoot and root
length (45.70 cm and 19.04 cm) followed by PFP-11(41.18 cm and 18.45 cm). Pot culture management of wilt, chemical fungicide Propiconazole 25 EC showed very less disease incidence (12.63%), followed by PT-11(20.38%), PFP-11(23.57%) and neem cake (31.38%).
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