Studies on Ecology and Control of Plectosporium Blight (Hakuhan-byo in Japanese), Plectosporium tabacinum (van Beyma) M. E. Palm, W. Gams & Nirenberg, of Pumpkin
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Accession number;07A0024750
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| Title;Studies on Ecology and Control of Plectosporium Blight (Hakuhan-byo in Japanese), Plectosporium tabacinum (van Beyma) M. E. Palm, W. Gams & Nirenberg, of Pumpkin |
| Author;
IZUMI SHOICHI
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
MATSUDA SUKIO
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
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Journal Title;Kagoshimaken Nogyo Shikenjo Kenkyu Hokoku
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Journal Code:Y0103A
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ISSN:0388-8215
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VOL.;NO.33;PAGE.73-93(2005)
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| Figure&Table&Reference;FIG.6, TBL.23, REF.19 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;On Plectosporium blight (Hakuhan-byo in Japanese), a new disease of pumpkin, in Kagoshima Prefecture, the ecology and control were studied in 1985-1991. Summary of the results are as follows: 1. The early symptoms of the disease were numerous small, sunken, spindle-shaped, white, tan or silver gray spots on stems, petioles, and main leaf veins of pumpkin. Individual spots were 1-2 mm long and often coalesced with each other. The leaves of diseased petioles were rapidly withered up, because the diseased petioles were easily broken. And many protuberant, grayish white spots appeared also on the surface of fruits. 2. The same fungus was invariably isolated from the lesions of diseased plants, and the symptoms were reappeared by inoculating isolates to pumpkin. The disease was named White stem blight (Hakuhan-byo in Japanese), caused by a new fungal species Cephalosporiopsis cucurbitae Hamaya et Inaba (in after years, the isolates re-identified as Plectosporium tabacinum.). 3. The optimum temperature range of mycelial growth of causal fungus was 25-27 C, the minimum and maximum being below 10 C and about 33 C respectively. And the optimum temperature range for disease development on pumpkin was also 25-27 C for lesions forming on plants. 4. The long time continuous wet period following inoculation of causal fungus was required for disease development, and a 12-hour wet period was no development of the disease. 5. Several fungicides, TPN, mancozeb, benomyl, thiophanate-methyl, and etc. were effective for inhibition of mycelial growth and spore germination of causal fungus. In the field experiment, the disease was practically controlled by 2-3 times spray in primary disease period with TPN, thiophanate-methyl or iminoctadine triacetate copper oxychloride. (author abst.) |
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