Stem Bleeding Disease Of Coconut: Reproduction Of Symptoms By Inoculation With Thielaviopsis Paradoxa
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Date
1986
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Abstract
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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J.Plantn.Crops 1986 v-14 i-2 p-130-133