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First report of twig blight of ban tulsi (Croton bonplandianus Bail.) caused by Choanephora cucurbitarum (Berk.and Ravenel) Thaxt. in India

100%

Das S., Dutta S., Ray S. K.

Journal of Plant Protection Research

2017

tom 57

nr 4

In August 2015, twig blight disease of ban tulsi (Croton bonplandianus Bail.) caused by Choanephora cucurbitarum (Berk. & Ravenel) Thaxt. was observed for the first time, in the Gangetic alluvial region of West Bengal, India. A severe disease incidence (40–50%) showed twig blight symptoms starting with shoot apical meristem (SAM), leaf, and blossom blight symptoms. Typical symptoms were characterized by over-projecting black pin head like emerging sporangiola which formed mycelial cushion on the infected surface. The present report describes the identification of the causal pathogen as C. cucurbitarum based on its morphology and the internal transcribed spacer of its ribosomal DNA (rDNA – ITS) sequences with 100% identity of NCBI-GenBank published Choanephora database. Optimum temperatures, 28–30°C, coupled with high relative humidity (80–90%) during the monsoon season enhances the disease’s progress. To the best of our knowledge this is the first report of twig blight of C. bonplandianus, caused by C. cucurbitarum, in India as well as globally.

Chemical control of rhododendron twig blight caused by Phytophthora ramorum

100%

Orlikowski L. B.

Journal of Plant Protection Research

2004

tom 44

nr 1

Biological activity of6 fungicides in the inhibition of Phytophthora ramorum sporulation and development ofblight on rhododendron leaves and stems were evaluated. All tested compounds at dose 8 µg ofa.i./cm3 already inhibited zoosporangia formation at least in 73%. On leafpetioles and leafdisks, taken from rhododendron one week after treatment with fungicides, formation of chlamydospores was especially suppressed by fenamidone + phosetyl Al and oxadixyl + mancozeb whereas development ofspores was not inhibited by cymoxanil + famoxate. All tested compounds significantly inhibited the development and spread oftwig blight on rhododendron. However, furalaxyl, applied as spraying of plants 48 hrs before or after inoculation of leaves and stems by P. ramorum was the most effective

Ograniczanie wyników

2 Journal of Plant Protection Research

1 Das S.

1 Dutta S.

1 Orlikowski L. B.

1 Ray S. K.

1 2017

1 2004

Wyniki wyszukiwania

First report of twig blight of ban tulsi (Croton bonplandianus Bail.) caused by Choanephora cucurbitarum (Berk.and Ravenel) Thaxt. in India

Chemical control of rhododendron twig blight caused by Phytophthora ramorum