Sujan Singh , R. K. Tewari , S. N. Mukebjee

Abstract

Eucolyptus tereticornis and E grandis are extensivly planted throught India for industrial wood. In their indigenous home, these specie did not develop the natural resistance against the pink disease pathogen, Colicin olmammice In high rainfall areas in India the species have suffered from catastrophic damage due to this disease which occurs indigenously on many hosts in India, The epidemiology and symptoms of the diseas, pathogenicitY of the fungus have been studied. Field trials ShOWed that E. toelliana, E. diglupra, Bischfire jwauniica and Pterocymbium tinctorium among others showed ,good performance and resistant to pink disease to warraot further large scale field trials.

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R. K. Tewari , S. N. Mukkerjee

Abstract

Eleven fungicides were tested in the laboratory to see their relative efficacy and to find out the minimum effective dose for the control of Corticium sumonic or Berk. & Br. Five concentrations of each fungicide were tested by filter papter disc method, Eight fungicides namely Benlate, Calixin, Kitazin, Hexathir, Hexaferb, Hexacap, Macuprax and Rordeaux mixture which proved to be effective at 1% concentration are Buggested for further trials in the field to find out their efficacy to control pink disease in eucalypts.

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Sujan Singh , R. K. Tewari

Abstract

Phialophora, a wood inhabiting non-decay fungus, was associated with decay in living teak. Prior colonisation of wood due to Phialophora accelerated decay due to three decay fungi in teak as determined from laboratory tests.

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M. A. Ram Reddy , R. K. Tewari , B. K. Bakshi

Abstract

At the Institute campus, plantations of Rauvolfia serpentina (Linn.) Benth. ex Kurz, a herbaceous crop of medicinal importance, suffered heavily from a leaf spot disease, caused by Corynespora cassiicola (Berk. & Curt.) Wei, whose pathogenicity was proved by inoculation experiments. Following initial screening of fungicides, fixing the dosage to be used and time of application as to whether they should be applied as prophylactic or curative, field trials were conducted using chemicals at 0.25% solution in water as prophylactic sprays applied six times at monthly intervals from June to November. Of the 4 fungicides tested in the field, only Captan proved effective in controlling the leaf spot disease resulting in significant increase in ischolar_main yield. The net increase in ischolar_main yield per acre in terms of money value was found to be about Rs. 85, Rs. 601 and Rs. 2,222 at the end of first, second and third year respectively.

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