Studies on the downy mildew of onion. 1. Formation and germination of oospore.

Minoru TAKAHASHI; Yutaka TANAKA; Chikao OISHI

doi:10.3186/jjphytopath.23.117

Studies on the downy mildew of onion.

1. Formation and germination of oospore.

Minoru TAKAHASHI, Yutaka TANAKA, Chikao OISHI

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JOURNAL FREE ACCESS

1958 Volume 23 Issue 3 Pages 117-120

DOI https://doi.org/10.3186/jjphytopath.23.117

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Published: October 30, 1958 Received: - Available on J-STAGE: February 19, 2009 Accepted: February 05, 1958 Advance online publication: - Revised: -
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Date of correction: February 19, 2009 Reason for correction: - Correction: TITLE Details: Wrong : Studies on the downy mildew of onion
Right : Studies on the downy mildew of onion.

Date of correction: February 19, 2009 Reason for correction: - Correction: SUBTITLE Details: Wrong : 1. Formation and germination of oospore
Right : 1. Formation and germination of oospore.

Date of correction: February 19, 2009 Reason for correction: - Correction: ABSTRACT Details: Wrong : The present paper deals with some ecological experiments of the oospores of Peronospora schleideni which may play an important role in the primary infection of downy mildew of onion. The causal fungus seems to be a physiological species of Peronospora schleideni Unger specialized in the size of oospores, the habit of their germination and the pathogenicity.
The oospores are produced in the tissue of affected leaves under the air temperature above 17°C, and, it is likely that the formation is related to the age of the leaves. The germination of the oospore occurs in the water, in the soil and on the leaves of seedlings. The oospore germinates at 20°C∼30°C, fails to germinate in the temperature range below 12°C and above 40°C. The germination is also accelerated by the pretreament with KMnO₄ or low temperature. In conclusion, the oospores existing in the soil become a source of the primary infection against the seedlings in seedbed.
Right : The present paper deals with some ecological experiments of the oospores of Peronospora schleideni which may play an important role in the primary infection of downy mildew of onion. The causal fungus seems to be a physiological species of Peronospora schleideni Unger specialized in the size of oospores, the habit of their germination and the pathogenicity.
The oospores are produced in the tissue of affected leaves under the air temperature above 17°C, and, it is likely that the formation is related to the age of the leaves. The germination of the oospore occurs in the water, in the soil and on the leaves of seedlings. The oospore germinates at 20°C-30°C, fails to germinate in the temperature range below 12°C and above 40°C.The germination is also accelerated by the pretreament with KMnO₄ or low temperature. In conclusion, the oospores existing in the soil become a source of the primary infection against the seedlings in seedbed.

Date of correction: February 19, 2009 Reason for correction: - Correction: AUTHOR Details: Wrong : Minoru TAKAHASHI, Yutaka TANAKA, Chikao OISHI¹⁾
Right : Minoru TAKAHASHI¹⁾, Yutaka TANAKA¹⁾, Chikao OISHI¹⁾

Date of correction: February 19, 2009 Reason for correction: - Correction: CITATION Details: Wrong : 1) Butler, E. J. and S. G. Jones: Plant Pathology, London (1949). p. 693.
3) Mckey, R.: Nature, 85: 3408. (1935).
4) -: J. Roy. Hort. Soc., 114: 272. (1939).
5) Murphy, P. A.: Nature, 58: 304. (1921).
6) - and R. Mckey: J. Dept. Lands and Agric. Ireland, 31: 60. (1932).

Right : 1) Butler, E.J. and S.G. Jones: Plant Pathology, London (1949). p. 693.
3) Mckey, R.: Nature, 85: 3408. (1935).
4) Mckey, R.: J. Roy, Hort. Soc 114: 272. (1939).
5) Murphy, P.A.: Nature, 58: 304. (1921).
6) Murphy, P.A.and R. Mckey:J. Dept. Lands and Agric. Ireland, 31: 60. (1932).

Date of correction: February 19, 2009 Reason for correction: - Correction: PDF FILE Details: -

Abstract

The present paper deals with some ecological experiments of the oospores of Peronospora schleideni which may play an important role in the primary infection of downy mildew of onion. The causal fungus seems to be a physiological species of Peronospora schleideni Unger specialized in the size of oospores, the habit of their germination and the pathogenicity.
The oospores are produced in the tissue of affected leaves under the air temperature above 17°C, and, it is likely that the formation is related to the age of the leaves. The germination of the oospore occurs in the water, in the soil and on the leaves of seedlings. The oospore germinates at 20°C-30°C, fails to germinate in the temperature range below 12°C and above 40°C.The germination is also accelerated by the pretreament with KMnO₄ or low temperature. In conclusion, the oospores existing in the soil become a source of the primary infection against the seedlings in seedbed.

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