Browsing by Author "Yateendra Joshi"

Now showing 1 - 4 of 4
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    A Practical Method of Seed Selection in Cashew
    (1982) Yateendra Joshi; Subbaiah, C.C.
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    Stem Bleeding Disease Of Coconut: Reproduction Of Symptoms By Inoculation With Thielaviopsis Paradoxa
    (1986) Nambiar, K.K.N.; Yateendra Joshi; Venugopal, M.N.; Mohan, R.C.
    Samples of diseased tissues were collected from coconut palms affected by the stem bleeding disease, growing in a number of locations in Karnataka, Kerala and Goa. The fungus Thielaviopsis paradoxa was consistently isolated from all locations. Characteristic symptoms of stem bleeding, in the form of rusty brown discolouration of bark, were reproduced in all the 11 inoculated palms located in Kasaragod, Appangala and Vittal. Inoculum comprised small pieces of coconut rachilla, used as a substrate, which were completely covered by an actively sporulating mycelium of Thielaviopsis paradoxa. These bits were introduced in bore-holes made on palm trunks. Symptoms appeared at inoculated sites within 2 weeks (at Appangala) to 8 weeks (Kasaragod and Vittal). The organism was re-isolated from the tissues taken from the inoculated palms.
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    Studies On Phytophthora Diseases Of Cacao Occurring In India
    (1979) Chandra Mohanan, R.; Anandaraj, M.; Yateendra Joshi
    The phytophthora diseases of cacao (Theobroma cacao L.) so far reported from India are: black pod, canker and sseedling die back. Twig dieback and chupon blight of cacao caused by Phytophthora palmiovra (Butler) Butler were severe in Kerala and Karnataka states of India. The fungus was isolated and its pathogenicity was proved. The symptoms of these diseases are described. This is the first reported occurrence of twig die back and chupon blight of cacao caused by P. palmivora from India. In cross inoculation studies, the P. palmivora isolate from cacao did not infect areca palm fruits, neither did the Phytophthora arecae (Coleman) Pethybridge isolated from mahali affected fruits infect cacao pods. P. palmivora is the most destructive of all the fungal pathogens attacking cacao in India and requires regular prophylatic measures. Ten fungicides were evaluated using detached cacao pods against P. palmivora of cacao. Among them, captafol (Difolatan 80W) at 0.2% and copper oxychloride (Cupramar), guazatine (Panoctine) and fenfuram (Panoram) each at 0.3% inhibited lesion development on pods completely.